406 Integrating Swift With Objective C [English].srt

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morning

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session 406 integrating swept for the
objective-c

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now many of us with demos here at the
conference start by creating either a

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brand new project from want to expose
project templates

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or a playground and that's great
playgrounds are a great way to explore

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this with language

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but many have you already have Mac or
Iowa saps

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and some areas but years writing
objective-c code

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here written a carefully you're the bug
bit

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polished it optimize it is just perfect

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from and we certainly don't want you to
have to

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through any better way or rewrite
anything that you don't want to

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also someone you had really a lot of
objective-c code that shouldn't may be

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spent a decade writing and maybe it's

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not so perfect it's not not as clean and
shiny

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so on you we're gonna be using
objective-c code for

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a while you might want to rewrite its
but it's not gonna happen this time

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around because you're gonna have to ship

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et cetera so objective-c is not going
away

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boats with an objective-c our first
class citizens

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for doing cocoa and Cocoa Touch
development and in fact

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we don't want to to spend any time that
you don't have to win when you stop

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refining objective-c code we want you to
be able to integrate swift

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as you want to and we do think that as
you implement new features

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as you finally get around to replacing
crafty

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subsystems that you want to use with for
that because if it's better

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a type safety its expressiveness

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its performance now

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many viewers also gained a lot of
knowledge and experience

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thing cocoa and Cocoa Touch two years
objective-c development and

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that applies a swift as well you use the
same frameworks

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the same classes the same API's with
some syntactic differences

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in fact the same design patterns such as
delegation

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all that knowledge applies and so we
expect that a lot of view

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are going to end up with projects that
contain both

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swift and objective-c and we worked hard
to make sure that Xcode lets you freely

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mix with an objective-c

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so this session over the next hour we're
gonna be talking to a bit more

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detail than what you've probably seen so
far about exactly how that works in

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practice

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we're gonna start simple by just
introducing some sweat code into an

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exact

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existing objective-c ap they will get a
little more interesting we're gonna

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start to add some swift code to a model
level framework

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which had is then embedded in
objective-c ap thank all that project to

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see

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will talk about how to start accessing a
pure swift framework

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which there'll probably be start showing
up up from an objective-c ap

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and then we'll talk as we go along about
how to adopt some other commonwealths

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tablished coca patterns

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been swept and again Swift is designed
from the ground up to be a great cocoa

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Cocoa Touch

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development language and so it has
language support

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for some other Coco idioms that we got
used to it so I could go on here for

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you know two dozen slides and talk in
detail about how this works but

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a rather just get a demo because that's
a usually been more clear

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alright

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so got a project here

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that some Sep I was ap

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and it has a better framework so it's
decently design here it's gotta

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the top layer which is the actual app
with the view and controller layer

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and our NBC design there is area

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framework all mister kit down here which
contains our model objects and all this

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is currently written in objective-c

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just get a sense of what this is

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let's go to run in the simulator and
gonna go ahead here and bring up the

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simulator

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we see that yet so typical is taking
application that can go and

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have color list here I can check off
items at cetera

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edit them when I can't do right now is
to add

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a new list this happens to be and I
cloud app so I could do that in my Mac

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happen it would show up here but for
this example we're going to use with to

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add the ability to add a new list

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in pilots facts I'm gonna back here

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and %uh the first thing I'm gonna do is
looked out here to the group you

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controllers

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and here we have some %uh view
controllers already written

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and objective-c kind Jake objective-c I
go to File

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credit file and in this case I was gonna
create an mp3 file cuz I wanna show you

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how to get started from scratch

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Xcode has great file templates and can
fill an order code for you

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we wanna do it on a basic way here show
how it's going to work

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I'm gonna call it new list controller

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and I'm gonna make sure that it is I
gonna coen go into the application

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target here

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we also see that I have mister kit which
is my framework and what are the new

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extensions here for showing India

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a the status of your so news controller

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now as I create this my first with file

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in a cure objective-c project expo will
offer to create for me was called the

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bridging header

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so abridging header we'll talk about
that more detail later

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but basically what it is is a way for
you to expose some with your objective

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c-

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API's to swept

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gonna go ahead and create that so I get
that by default

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now import foundation actually I'm gonna
be needing some you like it

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if you're here so I go ahead and change
that you like it

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and I know that I will need to import my
own model framework because we wanna

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obviously crater model objects from
within

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that you control and I'm just gonna go
ahead here and say

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new list controller

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and now when I complete we see that
because I said import

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you like it there swift balls in the
objective-c framework you like it

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and gives me a swift you all those
symbols

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something a subclass from your
controller and just leave it like that

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for now

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so we are just a basic empty class this
with class subclassing in Objective C

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Class

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that we get from you I from Cocoa Touch

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now we could sit here and I got
rectangles and create an API

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credit you I for this but fortunately it
happened already have one

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I how lucky it isn't wired up though so
we're gonna do that right now

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the first thing gonna do here is just
like with objective-c

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I need to set what the class above your
controllers

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sign up here and now we see that the new
list controller that I just created

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is shown here among all the ones
implement an objective-c so when you

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access your classes from sweat from

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Interface Builder the swift Objective C
Class A show up next to each other you

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can work with them

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as equals alright so now the next thing
I want to do after setting that

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I'm gonna go ahead and create a bar
button item here

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gonna drag that up into the toolbar up
here

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and I'm gonna change said in a fire to
be

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added that also changes the visual
appearance to give it a standard Cocoa

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Touch

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Add button block all credits segue

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it's gonna be a mobile segue this is
after all storyboard

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and or change the name that segue to be
new list

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now that's gonna the important a bit
later on so that we can access it from

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within our cut

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okay so now you may have seen and what
are the other demos how we can drag from

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swift code and connector objects

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inside as I P we can do the same thing
the other direction as well

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if I option click here on my swift class

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my view controller class implement in
swift now I can drag the other direction

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for sale gonna do is I'm gonna go ahead
and dragged from outlets

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and and certainly outlet here and I'm
going to call this

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name feel and we see that the UN text
field

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and a storage is weak because we have a
controller class

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two superb you are the view our key owns
the button and the name in the fields

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and the buttons

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in here and so we just won a weak
reference to it

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and in fact for me insert this

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Interface Builder knows it is what file
so uses the swift syntax

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just as it would have for objective-c

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and uses the ID outlet property

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for the stored property a sorry the idea
of what attribute for the stored

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property here

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and this is implicitly week and also
optional

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because not all the outlets may be
connected

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get myself some space there gonna go
ahead and do the same thing

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here for the buttons I'm just gonna

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control drag these and just gonna

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Phillies and the same way now this is a
sample app

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Megan just the space heater this is a
sample app

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and so it's not risk able to just have
sex partners and six outlets but

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I know that your design better a make
more maintainable code and this

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this is for illustrative purposes only I
you might want something I where you can

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load colors from a table you

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from a popular Stern Show the minute
able to you or something like that

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I'm gonna go ahead and finish connecting
these

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alright so now we have our outlets to
the UI components

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can also create actions in this way if I
choose the cancel button down here and I

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drag n

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that I can create an action up at the
top here just for as for objective-c

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a change the connection type 2 action
I'll take a council

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and we can just leave the typeof the
center as any object here we don't

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actually

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care because we're not going to be
messaging app

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what we will do however is to invoke
some Cocoa Touch API

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give myself some more room and i cant
say so

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dismiss and then code completion gives
me access to

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the Cocoa Touch API that we already know
I can complete here

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I'm not gonna need hey I wanted to be
animated site but true

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I don't need a completion blocks I get
it now now

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in objective-c we always have to message
cell if we want to talk to self

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Swift knows from context when you are
messaging yourself

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so we can actually leave this out make
this a bit more readable

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excellence alright so now we will
connect the buttons here as well

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and I'm going to be calling this pic
color

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now in this case i jus you I button

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I'm sorry I may need to make an outlook
an action

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archer's you I button down here because
in this case we will actually want to

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talk to the button or compare the button

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a so we want to have that type and as
you can see

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Interface Builder generate the code and
makes the center be a white button

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before forget I'm also going to wire up
the other

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actions here as well you see here

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to connect to this one

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for myself will be dispersed there

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and now they're all wired up to the same
action for all wired up to the same

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action the center will be different
depending on which button we touch

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now I wanna show the summer the power of
the swift SELECT statement here

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had a switch statement unlike
objective-c rather see based languages

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I can actually switch on I a wide
variety of different kinds of patterns

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in this case I'm just switching out what
the sundress

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but this is a very rich constructs

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and this win this with language and I
encourage you to catch one of the later

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talks about advance weft to the really
get into the depths of

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what you can use this for for right now

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to keep it simple I'm just going to use
it to match on a button and what I will

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say is

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okay now I need to assign something here
so I'm gonna need to have a store

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property

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credits toward property called selected
label

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because we're actually choosing labels
here represented as colors on the screen

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and then what I can do here as I can say
this is an AAPL

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list label so this again is an
objective-c

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type that has been imported

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through my import a blister kept up
there I'm gonna start out by saying that

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that is an AP list label

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stack great that's the default value
other

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because I don't put a question mark I
don't make it optional that means that

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it has to have a value

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remember the ID outlets are implicitly
optional now

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it's kinda early to have to repeat the
same thing here and in fact Swift has

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great support for type inference

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and what it knows exactly what type you
mean then you can go ahead and leave out

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the type so from this

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swift can tell exactly that okay this
has to be a catalyst label

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because that I'm initializing it so I
can just play about the type now I can

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complete my

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statement he recounts a selected label
it was dark grey and in fact

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I can address them here as well very
fast typer

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now we see here that objective-c

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I mean sorry Xcode swept has a message
for us here

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so in swift a 10 things to notices

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each other cases is impossibly ended

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at the beginning the next case see don't
have the cases see where you can

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possibly fall through and that's a
source of a lot of parts

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in fact switch with the clothes
explicitly designed to avoid many of the

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common pitfalls

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that are common in sea bass languages
now in this case

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another thing about the switch statement
is that it has to be exhaustive you have

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to say that you cover all the cases

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00:14:20,086 --> 00:14:23,120
in this particular case I'm just gonna
add the fault

238
00:14:24,002 --> 00:14:29,581
and what I'm gonna do in this case right
here is to use a swift standard library

239
00:14:29,779 --> 00:14:30,860
function to just wrapping to the
debugger

240
00:14:31,589 --> 00:14:34,660
because I wanna make sure that if I add
new buttons and help them up that I

241
00:14:34,066 --> 00:14:35,124
actually have the code for that as well

242
00:14:36,024 --> 00:14:39,048
so the record is happy

243
00:14:39,048 --> 00:14:42,147
that excellent we just set a property
that's all we've done so far

244
00:14:43,047 --> 00:14:46,143
but now we can use some more love the
Cocoa Touch

245
00:14:47,043 --> 00:14:50,110
API to actually make the button schorr
elected state

246
00:14:51,001 --> 00:14:55,017
show its absolute that state I should
say so

247
00:14:55,026 --> 00:14:58,057
we say I this case we can say sender

248
00:14:58,057 --> 00:15:02,061
dot and then we can use our code
completion to access the layer

249
00:15:02,061 --> 00:15:05,144
and then it will set its border with to
be

250
00:15:06,044 --> 00:15:10,097
fart and of course we have to initialize
that to be a border color

251
00:15:10,097 --> 00:15:13,192
as well now in this case because we're
accessing the layer

252
00:15:14,092 --> 00:15:17,511
that's a core graphics API we get the CG
color from

253
00:15:18,339 --> 00:15:23,395
the UI layer you eye color and all these
are standard Cocoa Touch

254
00:15:23,899 --> 00:15:27,800
API so you see that when we access our
own objective-c API's

255
00:15:27,008 --> 00:15:31,357
for the couple touch API's it looks all
the same we still use the same nice

256
00:15:32,149 --> 00:15:37,186
sweat syntax I don't think we can do
here is just say that the views

257
00:15:37,519 --> 00:15:41,601
a tent color is going to be the color
that corresponds to the label

258
00:15:42,339 --> 00:15:45,364
have for this we can call another one of
our

259
00:15:45,589 --> 00:15:50,670
functions that we brought in from
objective-c

260
00:15:50,067 --> 00:15:53,072
and we pass it the

261
00:15:53,072 --> 00:15:58,138
selected label benefactor for command
click on this

262
00:15:59,038 --> 00:16:02,089
we see here that we can get to a Swiffer
presentation

263
00:16:02,089 --> 00:16:07,098
above our own Objective C API and
navigate we could actually go back to

264
00:16:07,098 --> 00:16:07,107
the header itself

265
00:16:08,088 --> 00:16:13,143
that we declared from alright so now

266
00:16:14,043 --> 00:16:17,692
those are you are following closely here
made simple but a problem we set the

267
00:16:18,079 --> 00:16:19,260
border with 25

268
00:16:19,026 --> 00:16:24,087
whenever actually diesel like two
previous but so we can do is to keep

269
00:16:24,087 --> 00:16:24,161
track

270
00:16:25,061 --> 00:16:28,074
the currently selected button and in
this case

271
00:16:28,074 --> 00:16:31,139
I'm going to explicitly say that it's a
week store property

272
00:16:32,039 --> 00:16:36,116
so this is not gonna cause I the extend
the lifetime of that button

273
00:16:37,016 --> 00:16:41,097
which is after all owned by the view
hierarchy and

274
00:16:41,097 --> 00:16:44,966
I'm going to declare that this is a UI
button but its optional

275
00:16:45,839 --> 00:16:49,720
because when we first start out it has
no value

276
00:16:49,072 --> 00:16:53,088
and so we're gonna be able to check
weather has a value or not

277
00:16:53,088 --> 00:16:56,157
we had some code

278
00:16:56,949 --> 00:17:00,190
to set the selected but to the sander

279
00:17:00,019 --> 00:17:06,038
at the end up having assigned it and
then here we can say

280
00:17:06,209 --> 00:17:10,240
if Select button then

281
00:17:10,024 --> 00:17:15,048
we're gonna go ahead and clear out the
border on that one now

282
00:17:15,048 --> 00:17:19,407
this happens to be a object reference I
could do the same in objective-c with no

283
00:17:19,839 --> 00:17:19,845
value

284
00:17:20,439 --> 00:17:23,600
the one on the nice things about
optional since worked is that they apply

285
00:17:23,006 --> 00:17:24,325
to any tax value

286
00:17:24,919 --> 00:17:29,220
even a boolean or a scaler so in this
particular case

287
00:17:29,022 --> 00:17:32,033
I'm just gonna go ahead and set the
selected buttons layer

288
00:17:32,033 --> 00:17:36,112
border with 20 now you'll notice the the

289
00:17:37,012 --> 00:17:40,038
exclamation mark there this is the

290
00:17:40,038 --> 00:17:43,110
unwrapping operator and that says that
if I have an optional value

291
00:17:44,001 --> 00:17:47,049
then when I determine it has a value I
get at the actual value

292
00:17:47,058 --> 00:17:50,140
and if I forgot to check whether has a
value that will cause a trap if it

293
00:17:51,004 --> 00:17:51,058
doesn't

294
00:17:51,094 --> 00:17:54,095
so this is one other ways a swift makes
it safer

295
00:17:54,095 --> 00:17:57,184
to to write raps because you can catch
these areas earlier

296
00:17:58,084 --> 00:18:02,159
without having to add a lot of
assertions your cut so I think we're

297
00:18:03,059 --> 00:18:04,073
probably good to go here

298
00:18:04,073 --> 00:18:07,082
I'll was going to take a look and

299
00:18:07,082 --> 00:18:10,140
sure forgot something sour Selected
button

300
00:18:11,004 --> 00:18:15,008
and that's because I mistyped so that
shows that this is live right I'm not

301
00:18:15,008 --> 00:18:17,104
play in Quicktime reappear

302
00:18:18,076 --> 00:18:22,089
okay it's an hour here we have our ad
button

303
00:18:22,089 --> 00:18:26,103
to bring up a model she as we select

304
00:18:27,003 --> 00:18:31,011
the various buttons we can see that we
have the border and then we do that

305
00:18:31,011 --> 00:18:34,015
tense attempt the buttons down here and
of course

306
00:18:34,051 --> 00:18:39,066
the Save button doesn't yet work now I
just do you like I so I just by just

307
00:18:39,066 --> 00:18:42,072
make it look pretty but actually do the
model level work we're gonna ask I want

308
00:18:43,026 --> 00:18:46,049
my colleagues to come up at the moment
first let's take a look at what we did

309
00:18:46,049 --> 00:18:46,102
and

310
00:18:47,002 --> 00:18:51,040
this part okay

311
00:18:51,004 --> 00:18:57,050
so

312
00:18:57,086 --> 00:19:00,144
when we just do so first of all we added
some swift code

313
00:19:01,044 --> 00:19:05,118
to an objective-c ap and Xcode offer to
create as a bridging header

314
00:19:06,018 --> 00:19:10,057
which tracks actually going to some more
detail about with some plastic ok a

315
00:19:10,057 --> 00:19:10,123
class

316
00:19:11,023 --> 00:19:14,110
Kolkata class and swept in this case it
happened to be a quick touch class

317
00:19:15,001 --> 00:19:16,067
that's part of the standard libraries

318
00:19:16,076 --> 00:19:20,125
this up Kat touch itself but it could
also be one of your objective see crisis

319
00:19:21,025 --> 00:19:21,118
that you've declared

320
00:19:22,018 --> 00:19:26,063
we use with class in Interface Builder
and as I hope you saw

321
00:19:26,063 --> 00:19:29,155
it's exactly like working with Objective
C Class that's actually if a mother here

322
00:19:30,055 --> 00:19:32,079
that we wanted to feel like yeah

323
00:19:32,079 --> 00:19:37,098
exactly the same thing it's
interchangeable and so now

324
00:19:37,098 --> 00:19:40,153
to I make this a bit more real in terms
of the model

325
00:19:41,053 --> 00:19:44,129
I'm gonna ask my colleague dave to come
up and complete the project airport

326
00:19:45,029 --> 00:19:52,029
work on a further

327
00:19:52,077 --> 00:19:55,095
art think Sounders a what we saw

328
00:19:55,095 --> 00:19:58,123
I is that you have access to everything

329
00:19:59,023 --> 00:20:03,060
in Cocoa Touch and the power that you've
got an Xcode

330
00:20:03,006 --> 00:20:07,043
from swift without really doing anything
but I'm sure what you thinking now is

331
00:20:07,097 --> 00:20:10,182
what about my code what about the
objective-c code that I have in my

332
00:20:11,082 --> 00:20:11,147
target

333
00:20:12,047 --> 00:20:16,071
in my app and that's what I want to show
you as ender said

334
00:20:16,071 --> 00:20:20,087
we could spend a lot of time and slides
and everything else in I'm actually

335
00:20:20,087 --> 00:20:21,516
kinda love shorter than he did

336
00:20:22,299 --> 00:20:28,970
and just go straight into a demo and so

337
00:20:28,097 --> 00:20:33,104
we come back right where we were before
and for our purposes the person you want

338
00:20:34,004 --> 00:20:36,048
to do here is a little bit of tidy up

339
00:20:36,048 --> 00:20:40,060
and that is to make are you i text field
behave the way that we want

340
00:20:40,006 --> 00:20:43,083
for our User I it offers a great deal
with configurability

341
00:20:44,037 --> 00:20:48,098
I using the delicate pattern and to do
that

342
00:20:48,098 --> 00:20:51,177
are we're going to make new s controller

343
00:20:52,059 --> 00:20:55,130
conform to you i text field

344
00:20:55,013 --> 00:20:58,025
delegate which is easy

345
00:20:58,025 --> 00:21:05,025
as if I could type

346
00:21:07,098 --> 00:21:10,111
fine being are you i text feel man

347
00:21:11,011 --> 00:21:17,190
I'm having some time here

348
00:21:17,289 --> 00:21:24,289
it's a comedy show I promise

349
00:21:25,289 --> 00:21:28,870
there you go alright something call out
there

350
00:21:28,087 --> 00:21:33,102
is success

351
00:21:34,002 --> 00:21:37,057
met the hardest thing I'm going to do

352
00:21:37,057 --> 00:21:39,105
the whole time I'm up here

353
00:21:40,005 --> 00:21:43,052
not so you i text field delegate all we
did here was

354
00:21:43,052 --> 00:21:47,098
at add the protocol conformance to the
end of a comma-separated list

355
00:21:47,098 --> 00:21:51,185
after our class hi in our case it's
important because we're actually

356
00:21:52,085 --> 00:21:55,091
not we actually have a superclass that
the superclass is the first thing

357
00:21:55,091 --> 00:22:00,188
in that last and then our protocols
follow now that I house I

358
00:22:01,088 --> 00:22:06,089
managed to declare takes a delegate I'm
actually gonna take it easy for the next

359
00:22:06,089 --> 00:22:06,097
part

360
00:22:07,069 --> 00:22:11,150
and just bring in the implementation
text field should return

361
00:22:12,005 --> 00:22:15,012
the only thing we're doing here is
resigning first responder

362
00:22:16,002 --> 00:22:20,014
on a text field and returning to make
sure the keyboard dismisses when the

363
00:22:20,032 --> 00:22:20,129
user hits return

364
00:22:21,029 --> 00:22:26,042
I'll not particularly interesting

365
00:22:26,042 --> 00:22:30,073
fun it was just as easy as it would be
an objective-c

366
00:22:30,073 --> 00:22:33,136
to go ahead and implement this protocol
next

367
00:22:34,036 --> 00:22:37,089
as under strongest we are going to look
a little bit more

368
00:22:37,089 --> 00:22:40,120
at the interaction with the model side
of things

369
00:22:41,002 --> 00:22:46,031
and actually implement save first thing
I'm going to do in

370
00:22:46,049 --> 00:22:50,090
got the air here somebody knows what I
forgot to do

371
00:22:50,009 --> 00:22:56,086
and that is managed to the clear to the
UI text field I get but we never

372
00:22:57,067 --> 00:22:57,143
actually

373
00:22:58,043 --> 00:23:05,043
connected Matt would have made for an
interesting and now we've got

374
00:23:05,048 --> 00:23:09,131
that set up I will control drag over

375
00:23:10,031 --> 00:23:16,045
manage hit the button set it up as an
action

376
00:23:16,045 --> 00:23:21,046
college say now

377
00:23:21,055 --> 00:23:25,087
insight here I actually want to interact
with

378
00:23:25,087 --> 00:23:28,172
a the representation

379
00:23:29,072 --> 00:23:32,133
are documents that we see in the
document list

380
00:23:33,033 --> 00:23:36,037
on the main screen and that's a part of
our ap target

381
00:23:36,037 --> 00:23:39,100
not a party with your kids and because
of that we have to take a different

382
00:23:40,000 --> 00:23:41,057
approach we can just simply

383
00:23:41,057 --> 00:23:45,148
import our framework and and this is
where we make use of the object to see

384
00:23:46,048 --> 00:23:47,059
bridging Hatter

385
00:23:47,059 --> 00:23:50,128
that Xcode offered to create for us when
we created the first with file

386
00:23:51,028 --> 00:23:55,064
in this project so will navigate over to
that

387
00:23:55,064 --> 00:24:00,100
and it gets created in the same
directory

388
00:24:01,000 --> 00:24:04,022
are in the same group I should say as

389
00:24:04,022 --> 00:24:07,029
this will probably created its

390
00:24:07,092 --> 00:24:10,159
not overly interesting at first it
simply has a comment that's

391
00:24:11,059 --> 00:24:14,063
very instructive this is where we put me
imports

392
00:24:14,099 --> 00:24:17,171
for the classes in our target that we
want to expose to swept

393
00:24:18,071 --> 00:24:22,148
in our case it's a single class and that
is are

394
00:24:23,048 --> 00:24:27,117
list info class this is the
representation that backs

395
00:24:28,017 --> 00:24:32,024
view to the table view that you see when
the app initially comes up

396
00:24:32,024 --> 00:24:35,029
save my and

397
00:24:35,074 --> 00:24:41,126
head back to really don't need the
storyboard anymore

398
00:24:42,026 --> 00:24:45,069
so I'm gonna go ahead and collapsed
things down

399
00:24:45,069 --> 00:24:49,086
and let us actually focus on the coaches
the wrapping really kinda

400
00:24:49,086 --> 00:24:52,119
gets on my nerves when things I like
about slip Swift is it a little more

401
00:24:53,019 --> 00:24:53,088
succinct

402
00:24:53,088 --> 00:24:57,133
so just heading back down to our Save

403
00:24:58,033 --> 00:25:01,091
now that we've pulled in the bridging
Hatter her

404
00:25:01,091 --> 00:25:03,150
now that we've added our class the
bridging header we can actually create

405
00:25:04,005 --> 00:25:04,052
one

406
00:25:04,097 --> 00:25:08,098
I'm gonna create it as let because it's
going to be counseling in a sign at once

407
00:25:08,098 --> 00:25:11,156
and so my list info

408
00:25:12,056 --> 00:25:15,078
is equal wished

409
00:25:15,078 --> 00:25:22,078
info

410
00:25:23,019 --> 00:25:26,095
and of course keeps saying list info

411
00:25:26,095 --> 00:25:30,174
like reinstruct you guys to do when
reading object Seco we actually use a

412
00:25:31,074 --> 00:25:31,081
prefix

413
00:25:32,044 --> 00:25:35,089
and I've been writing about us with good
lately so it's not on the forefront of

414
00:25:35,089 --> 00:25:36,188
my mind so

415
00:25:37,088 --> 00:25:41,089
our list info and it offers us two
constructors

416
00:25:41,089 --> 00:25:44,166
one of them takes URL the other takes in
in this meta data item for that I cloud

417
00:25:45,066 --> 00:25:46,089
support we're talking about

418
00:25:46,089 --> 00:25:50,113
Realty you are on I could construct the
URL right here

419
00:25:51,013 --> 00:25:54,812
little bit aforethought thinking forward
I know that I'm actually going to want

420
00:25:54,929 --> 00:25:55,470
to

421
00:25:55,047 --> 00:25:59,082
revise this a little bit later and
iterate on it so I'm gonna set up

422
00:25:59,082 --> 00:26:02,181
a computed property as a convenience

423
00:26:02,919 --> 00:26:06,933
after the car computer property

424
00:26:07,059 --> 00:26:10,096
is pretty similar to the way we do
define

425
00:26:10,429 --> 00:26:14,220
a stored property and

426
00:26:14,022 --> 00:26:19,231
movie with a far I'm gonna call file URL
now with the computer property we do

427
00:26:19,429 --> 00:26:20,330
have to be

428
00:26:20,033 --> 00:26:24,632
explicit about our type I'm going to
make it optional

429
00:26:24,929 --> 00:26:29,941
and that's because if the user actions
and providers a value in that actually a

430
00:26:30,049 --> 00:26:33,110
I can't control I can actually construct
a valid URL

431
00:26:33,011 --> 00:26:37,580
I've got an implementation ready that
just happens to

432
00:26:37,679 --> 00:26:41,200
make use of the list coordinator from
down in which to get

433
00:26:41,002 --> 00:26:45,067
and after defining the computed property

434
00:26:45,085 --> 00:26:48,139
I can come down and make you submit

435
00:26:49,039 --> 00:26:53,040
right away and unnoticed as Anders and
mention earlier

436
00:26:53,004 --> 00:26:57,036
we don't actually have to explicitly
refer to self when accessing our

437
00:26:57,072 --> 00:26:57,127
property

438
00:26:58,027 --> 00:27:03,084
set up a few pieces of information that
we've captured for the user

439
00:27:03,084 --> 00:27:06,673
so you get the name from our name

440
00:27:07,429 --> 00:27:11,080
feel its text

441
00:27:11,008 --> 00:27:15,026
and the label

442
00:27:15,026 --> 00:27:19,065
is going to be equal to you are selected
label

443
00:27:19,065 --> 00:27:22,066
and that looks good

444
00:27:22,075 --> 00:27:26,109
so now we set it up we actually want to
save this out

445
00:27:27,009 --> 00:27:34,009
and list info provides us a convenience
for that and we will

446
00:27:34,086 --> 00:27:38,785
Creek a and say with completion handler

447
00:27:39,559 --> 00:27:43,330
this completion and was actually I
called is gonna come back to us

448
00:27:43,033 --> 00:27:49,037
with a ball letting us know whether or
not the same was successful

449
00:27:49,037 --> 00:27:53,115
and I could use what code completion
suggesting here

450
00:27:54,015 --> 00:27:58,079
and fill out Maya completion handler
closure

451
00:27:58,079 --> 00:28:01,146
inside the parentheses but because it's
the last

452
00:28:02,046 --> 00:28:05,049
I argument at

453
00:28:05,049 --> 00:28:10,130
in the call and because its closure in
skimpy little long

454
00:28:11,003 --> 00:28:14,055
I'm actually make use up Swiss trailing
closure cent tax

455
00:28:14,082 --> 00:28:18,140
and in this case I don't even have to
put the forensic after the method call

456
00:28:19,004 --> 00:28:22,098
because are up create and say with
completion and we're actually doesn't

457
00:28:23,034 --> 00:28:23,042
take any other

458
00:28:24,014 --> 00:28:27,183
arguments so inside here

459
00:28:27,309 --> 00:28:33,410
I will note the variable names being
passed inches success

460
00:28:33,041 --> 00:28:38,042
have more typing problem so that you
guys can get a good laugh

461
00:28:38,051 --> 00:28:42,110
and I just checked the value and for now
I'm going to

462
00:28:43,001 --> 00:28:46,090
print a little debug message to let me
know that it was saved

463
00:28:46,099 --> 00:28:50,161
and

464
00:28:51,061 --> 00:28:56,128
just like cancel we want to get out of
the user's way now so we'll go ahead and

465
00:28:57,028 --> 00:28:57,111
dismiss

466
00:28:58,011 --> 00:29:01,074
so

467
00:29:01,074 --> 00:29:06,096
let's be building Ron see that
everything is doing what we want to do

468
00:29:06,096 --> 00:29:07,145
make sure everything is on a

469
00:29:08,045 --> 00:29:12,127
good to go bring it up

470
00:29:13,027 --> 00:29:18,045
up RC I need to go to the hardware store
a little later

471
00:29:18,045 --> 00:29:22,053
I and shown the more with hardware hit
return

472
00:29:23,025 --> 00:29:26,072
keyboard goes away that's good time up

473
00:29:26,072 --> 00:29:30,031
hardware store I frequent actually uses
orange in the logo rather have a week so

474
00:29:30,679 --> 00:29:32,700
that's going to help me remember what's
going on there

475
00:29:32,007 --> 00:29:36,075
an overhead hit Save button knots

476
00:29:37,038 --> 00:29:42,087
not really what we've wanted I really
wanna see my hardware will show up here

477
00:29:42,429 --> 00:29:46,690
did actually save go over check the
debug console

478
00:29:46,069 --> 00:29:50,122
indeed it did save

479
00:29:51,022 --> 00:29:54,111
and just for fun actually stop

480
00:29:54,309 --> 00:29:58,310
and run the app again and you'll see
that it actually did saving it created

481
00:29:58,409 --> 00:30:02,240
but we never passed anything back to our
document list

482
00:30:02,024 --> 00:30:05,095
to you let know that we created anything
new and

483
00:30:05,095 --> 00:30:09,098
what kinda wanted this to not be sitting
there in polling the filesystem

484
00:30:09,098 --> 00:30:13,153
over and over and over again just
looking for new files that might show up

485
00:30:14,053 --> 00:30:17,145
so for our purposes we're going to take
a page outta you i text fields book

486
00:30:18,045 --> 00:30:22,050
and erection use delegation to pass
information back to the view controller

487
00:30:22,095 --> 00:30:24,314
the presented us

488
00:30:25,169 --> 00:30:28,240
the first step there is usually to
define

489
00:30:28,024 --> 00:30:32,025
a protocol that we expect our delegate
to conform to

490
00:30:32,034 --> 00:30:35,053
and in swift we can do that

491
00:30:35,053 --> 00:30:38,149
just as easily as declaring the class or
struct or anything else

492
00:30:39,049 --> 00:30:42,112
will just start with the protocol
keyword

493
00:30:43,012 --> 00:30:46,024
that I actually spoke color correctly

494
00:30:46,024 --> 00:30:52,108
and new this controller delegate

495
00:30:53,008 --> 00:30:56,059
and Rd have a method

496
00:30:56,059 --> 00:30:59,061
that I want my delegate to conform to
that I've prepared that just

497
00:30:59,061 --> 00:31:03,087
takes a new s controller analyst info
wedding at No

498
00:31:03,087 --> 00:31:08,376
what's been created done over here now
at this point this protocol is visible

499
00:31:09,159 --> 00:31:15,208
too much with co but i wanna make sure
that my object seeker can see it as well

500
00:31:15,649 --> 00:31:18,690
to do that it's a simple

501
00:31:18,069 --> 00:31:21,151
as adding attributes

502
00:31:22,051 --> 00:31:26,080
at obj see and this is gonna go ahead
and say even though this is all swift

503
00:31:26,008 --> 00:31:26,064
here

504
00:31:27,036 --> 00:31:31,075
we do want to make this available to
objective-c

505
00:31:31,399 --> 00:31:35,940
a little bit later on to know that I
have a delegate protocol

506
00:31:35,094 --> 00:31:39,130
actually define a delegate

507
00:31:40,003 --> 00:31:43,047
and will make it we care because

508
00:31:43,074 --> 00:31:48,079
we don't really want to own it we don't
extend its life time

509
00:31:48,079 --> 00:31:51,938
and I can declare it as

510
00:31:52,649 --> 00:31:55,830
being just above the newest control a
delegate type

511
00:31:55,083 --> 00:31:58,099
I don't have to do something like I D E

512
00:31:58,099 --> 00:32:01,145
an angle brackets around my protocol to
indicate what's going on here

513
00:32:02,045 --> 00:32:07,099
I can simply have a property that is %uh
this delegate type

514
00:32:07,099 --> 00:32:12,135
it's gonna be optional because I may not
have Adelia

515
00:32:13,035 --> 00:32:16,094
snow we've defined a delegate property

516
00:32:16,409 --> 00:32:19,860
thing maybe we ought to do something a
little more useful than printing a debug

517
00:32:19,086 --> 00:32:21,104
statement down here

518
00:32:22,004 --> 00:32:26,009
after that we're going to reach out to
our delegate

519
00:32:26,009 --> 00:32:29,478
and I make use I'll

520
00:32:29,559 --> 00:32:33,600
another swift feature which is optional
chaining

521
00:32:33,006 --> 00:32:38,080
so the delegate is an option of it may
or may not have a value

522
00:32:39,034 --> 00:32:42,128
by adding a question mark here before
actually calling out to you

523
00:32:43,028 --> 00:32:46,101
the method that we want to invoke I'm
going to be able to say

524
00:32:47,001 --> 00:32:50,038
if I have a delegate if there is a value
their

525
00:32:50,038 --> 00:32:53,057
make this call if there's not

526
00:32:53,399 --> 00:33:00,399
don't do anything

527
00:33:02,005 --> 00:33:06,014
and now I'm trying to remember what the
name of that was out there we are

528
00:33:06,059 --> 00:33:09,065
past myself and

529
00:33:10,019 --> 00:33:15,025
the list info that we just created

530
00:33:15,079 --> 00:33:19,136
really not much but I pissed in case you
can't tell

531
00:33:20,036 --> 00:33:24,050
and at this point we wrapped up the
swift implementation

532
00:33:24,005 --> 00:33:29,005
have this but we've defined as delegate
now we actually need our objective Seco

533
00:33:29,005 --> 00:33:32,058
to be able to see the swift code we've
just put together

534
00:33:33,003 --> 00:33:39,057
and interact with it to do that I'm
going to head back over to the document

535
00:33:39,057 --> 00:33:42,796
the the controller for the document list

536
00:33:43,309 --> 00:33:46,760
and inside here

537
00:33:46,076 --> 00:33:49,715
we're brunt to give me what comes to
your mind

538
00:33:50,399 --> 00:33:54,400
is the fact that the way I make one
object an object see

539
00:33:54,409 --> 00:33:58,434
available invisible to another object is
by importing its header

540
00:33:58,659 --> 00:34:02,110
wall was swift we don't have headers

541
00:34:02,011 --> 00:34:05,110
I we think that's a good thing within
swift we've gotta find a way to

542
00:34:06,001 --> 00:34:10,220
your bridge the gap back to you
objective-c

543
00:34:10,319 --> 00:34:13,346
and so in that case Xcode got her back
and

544
00:34:13,589 --> 00:34:18,600
is going to provide us with 8 generated
header

545
00:34:18,006 --> 00:34:23,094
that contains the entirety of our swift
interface

546
00:34:24,048 --> 00:34:28,079
being generated obviously it has to have
a well constructed a

547
00:34:28,079 --> 00:34:32,083
naming scheme and that's going to be our
product name

548
00:34:33,019 --> 00:34:36,045
which in this case is Worcester dash

549
00:34:36,045 --> 00:34:39,099
swift dot H

550
00:34:39,099 --> 00:34:42,180
and so this is the generated header some
gonna go ahead and take time to build to

551
00:34:43,008 --> 00:34:45,837
make sure we get the most up-to-date

552
00:34:46,629 --> 00:34:50,870
items in it I and after importing

553
00:34:50,087 --> 00:34:53,346
that we will

554
00:34:54,129 --> 00:34:56,225
come over here and we're gonna go
through basically the same process that

555
00:34:57,089 --> 00:34:58,230
you would

556
00:34:58,023 --> 00:35:02,025
ordinarily to implement any of the coke
or Cocoa Touch delegates

557
00:35:02,043 --> 00:35:08,952
on your own clash out our protocol
conformance

558
00:35:09,339 --> 00:35:13,890
and we can pull in our newest control a
delegate

559
00:35:13,089 --> 00:35:16,147
I'm going to choose to

560
00:35:17,047 --> 00:35:21,056
use the jump are to head down to an
appropriate place I feel too I go ahead

561
00:35:21,056 --> 00:35:24,585
and implement this

562
00:35:25,089 --> 00:35:30,870
and as I could complete here

563
00:35:30,087 --> 00:35:34,036
with the newest controller did create
list info you'll notice that

564
00:35:34,819 --> 00:35:37,823
even though we declare this completely
in with within swift

565
00:35:37,859 --> 00:35:41,150
we get is a syntax

566
00:35:41,015 --> 00:35:44,081
that matches what I'd expect from
objective-c so that everything still

567
00:35:44,081 --> 00:35:46,176
feels natural everything feels like a
first-class citizen

568
00:35:47,076 --> 00:35:50,128
in its place

569
00:35:51,028 --> 00:35:56,037
happen to have the implementation

570
00:35:56,037 --> 00:35:59,069
where a or the implementation the last
thing

571
00:35:59,069 --> 00:36:03,146
ready hi in this case what we're really
doing is just updating our data sources

572
00:36:04,046 --> 00:36:06,142
and then refreshing the table view with
a little bit a new information

573
00:36:07,042 --> 00:36:11,141
and the very last thing here

574
00:36:12,041 --> 00:36:15,124
the final stop is that we actually need
this view controller to

575
00:36:16,024 --> 00:36:19,030
make itself the delegate for a new US
Comptroller

576
00:36:19,084 --> 00:36:22,092
we're using a modal segue

577
00:36:22,092 --> 00:36:26,171
so why not do it and prepare for Segway
down here will just check

578
00:36:27,071 --> 00:36:31,099
to make sure that it's the right segue
will grab the newest controller

579
00:36:31,099 --> 00:36:35,104
and we'll set ourselves in this case are
with documents you controller

580
00:36:36,049 --> 00:36:41,135
as the delegate this point I fully
expect things

581
00:36:42,035 --> 00:36:45,097
to do

582
00:36:45,097 --> 00:36:50,161
what I want

583
00:36:51,061 --> 00:36:54,074
and coming up with another list

584
00:36:54,074 --> 00:36:57,107
to be every CE

585
00:36:58,007 --> 00:37:01,046
morass have apps

586
00:37:01,046 --> 00:37:05,122
not really sure what those are yet but
I'm pretty sure I'm gonna pick something

587
00:37:06,022 --> 00:37:06,057
up

588
00:37:06,057 --> 00:37:09,089
and this time

589
00:37:09,089 --> 00:37:12,141
it actually comes through shows up in
our document view controller

590
00:37:13,041 --> 00:37:17,097
just for you know groups say I come into
it I can change it around

591
00:37:17,097 --> 00:37:19,186
I really like the salmon color that
they're using for the Apple badges this

592
00:37:20,086 --> 00:37:21,153
year so I'm gonna actually picked that

593
00:37:22,053 --> 00:37:26,057
and that sa

594
00:37:26,093 --> 00:37:33,093
integrating our code

595
00:37:37,001 --> 00:37:39,053
and just to head back to the slides for
a second

596
00:37:39,062 --> 00:37:42,104
what we've just seen here

597
00:37:43,004 --> 00:37:46,069
is that it's very easy to expose our
objective c- code

598
00:37:46,069 --> 00:37:50,127
to swept simply import whatever headers
you want into the bridging Hatter

599
00:37:51,027 --> 00:37:56,085
and will be made available to the swift
in your target we define a protocol in

600
00:37:56,085 --> 00:37:56,091
swift

601
00:37:57,045 --> 00:38:00,049
which was as easy as defining a protocol
in objective-c

602
00:38:00,085 --> 00:38:03,089
finally we've

603
00:38:03,089 --> 00:38:06,096
exposed that protocol and the class that
we just created

604
00:38:07,059 --> 00:38:10,157
in swift back to the objective-c code in
our target and

605
00:38:11,057 --> 00:38:14,072
we actually have to do anything there
Xcode did

606
00:38:14,072 --> 00:38:17,075
the generation of the header the
provided that interface

607
00:38:18,002 --> 00:38:21,016
just to reiterate

608
00:38:21,016 --> 00:38:25,070
little bit more win we wanna go from

609
00:38:25,007 --> 00:38:28,044
our objective c- hatter's and make our
objective c-

610
00:38:29,007 --> 00:38:32,012
objects available swift we're going
through the bridging Hatter

611
00:38:32,057 --> 00:38:36,091
this is going to be creative actual
offer to create this for you

612
00:38:36,091 --> 00:38:36,173
automatically

613
00:38:37,073 --> 00:38:40,102
when you at it's with file to an
existing objective-c target

614
00:38:41,002 --> 00:38:44,031
for an objective-c file to an existing
swift target

615
00:38:44,031 --> 00:38:47,126
when we want to

616
00:38:48,026 --> 00:38:51,098
get our swift interface

617
00:38:51,098 --> 00:38:55,170
exposed to our object see implementation
there we're looking at the generated

618
00:38:56,007 --> 00:38:57,069
header the tax code provides

619
00:38:58,032 --> 00:39:02,038
and this is going to be named after our
product and it's going to be

620
00:39:02,092 --> 00:39:08,133
our product name bash swift dot H one
last thing to remember about these

621
00:39:09,033 --> 00:39:12,096
is

622
00:39:12,096 --> 00:39:15,118
that the bridging Hatter

623
00:39:16,018 --> 00:39:19,026
is created for you by Xcode but you own
it

624
00:39:19,026 --> 00:39:22,043
from that point forward so it should be
something you check in your source

625
00:39:22,043 --> 00:39:23,051
control system

626
00:39:23,051 --> 00:39:26,073
it should be something that

627
00:39:26,073 --> 00:39:31,166
you maintain you manage and it's there
so that you only exposed to Swift what

628
00:39:32,066 --> 00:39:33,133
you want to expose to swept

629
00:39:34,033 --> 00:39:38,054
in the case to the generated header it's
just packets generated as part of the

630
00:39:38,054 --> 00:39:38,150
build process

631
00:39:39,005 --> 00:39:42,061
it's going to contain your compy the
complete interface

632
00:39:43,006 --> 00:39:46,043
for thus with files within your target

633
00:39:46,043 --> 00:39:49,110
and those you can be readily available
to check to see simply by importing Mad

634
00:39:50,001 --> 00:39:50,039
Hatter

635
00:39:50,048 --> 00:39:54,114
so this point to talk with you a little
bit more

636
00:39:55,014 --> 00:39:58,056
about what you can do with frameworks

637
00:39:58,056 --> 00:40:01,144
in your product in your project I like
him but my colleague Jordan up

638
00:40:02,044 --> 00:40:09,044
think they've alright

639
00:40:09,007 --> 00:40:13,024
so we see no UV it is to deal with
integrating your swift code

640
00:40:13,087 --> 00:40:17,115
into an existing object if the app and
it could pretty much take care of all

641
00:40:18,015 --> 00:40:20,104
the details for you to tell one
Interface Builder it going to show up in

642
00:40:21,004 --> 00:40:21,090
the simulator

643
00:40:21,009 --> 00:40:24,101
everything works just fine but I can
move a step down in the hierarchy

644
00:40:25,082 --> 00:40:30,169
and like the framework

645
00:40:31,069 --> 00:40:34,097
so at this point we've been working
pretty much the entire time up in this

646
00:40:34,097 --> 00:40:35,192
twister part of the application

647
00:40:36,092 --> 00:40:39,155
which the actual application target now
we're gonna move down to

648
00:40:40,055 --> 00:40:43,126
lift ticket which handles the model and
the object graph for this target

649
00:40:44,026 --> 00:40:48,039
and specifically we're going to add new
functionality the ability to add

650
00:40:48,039 --> 00:40:51,042
attachment to every but i dont something
like

651
00:40:51,042 --> 00:40:54,078
a a photo or a voice recording

652
00:40:54,078 --> 00:40:58,159
to do this in Objective C you would
create a new class added to your object

653
00:40:59,059 --> 00:41:00,136
graph by adding new property

654
00:41:01,036 --> 00:41:04,070
and in setting up an interface to manage
it we're going to do the exact same

655
00:41:04,007 --> 00:41:04,072
thing

656
00:41:05,035 --> 00:41:08,120
but using swept property are by going to
file

657
00:41:09,002 --> 00:41:13,033
new file and this time a tease the Cocoa
Touch clap template

658
00:41:13,051 --> 00:41:16,053
I can name that APL with Diane

659
00:41:16,053 --> 00:41:20,056
attachment pump at the Venice object and
the language support

660
00:41:20,056 --> 00:41:24,065
is swept and make sure that in the lift
ticket target

661
00:41:24,065 --> 00:41:28,137
and click Create you noted here that
Xcode did not

662
00:41:29,037 --> 00:41:33,059
offer to create a breeding better for us
this is because we're working with a

663
00:41:33,059 --> 00:41:37,141
framework target in a framework you
already have a header that backed by the

664
00:41:38,041 --> 00:41:39,102
entire content on the framework

665
00:41:40,002 --> 00:41:43,081
that's your umbrella hat er so when
you're working with a free market are

666
00:41:43,081 --> 00:41:43,127
getting

667
00:41:44,027 --> 00:41:47,082
swept everything that's available in
your umbrella hat er

668
00:41:47,082 --> 00:41:50,088
what automatically be visible to the
swift code no work required

669
00:41:51,042 --> 00:41:56,078
311 a taxonomic superset

670
00:41:56,078 --> 00:41:59,080
to the very first thing I'm going to do
it at a compartment to

671
00:41:59,008 --> 00:42:04,037
a standard Cocoa Touch protocol and its
coding attachments are made up of two

672
00:42:05,009 --> 00:42:06,057
things their data

673
00:42:06,057 --> 00:42:09,063
which I will represent anything in its
data and their type

674
00:42:09,063 --> 00:42:12,078
for tight update at Cocoa Touch like to
you

675
00:42:12,078 --> 00:42:16,135
uniform type identifiers which are very
general way to represent filing data

676
00:42:17,035 --> 00:42:18,041
type and these are just

677
00:42:18,095 --> 00:42:23,161
start at strength the next thing to do
here to declare and initialize there

678
00:42:24,061 --> 00:42:27,083
and that just take the data anti prom
outside

679
00:42:27,083 --> 00:42:31,091
and will I find them into our own field
but we do need to be careful

680
00:42:31,091 --> 00:42:35,132
because the data that we are given might
be in and it's mutable data

681
00:42:36,032 --> 00:42:39,037
and somebody might try to change it
after they've created our attachment

682
00:42:39,082 --> 00:42:42,169
so in order to work around it we need to
call the copy method

683
00:42:43,069 --> 00:42:48,110
however copy returned ID and objected
the

684
00:42:49,001 --> 00:42:52,048
and swept that's going to come through
as be any object type

685
00:42:52,057 --> 00:42:56,106
we can't go directly from any object and
at the day that

686
00:42:57,006 --> 00:43:01,011
in swept because that's not guaranteed
to be day so instead we have to

687
00:43:01,011 --> 00:43:02,087
explicitly tell the compiler

688
00:43:02,087 --> 00:43:05,091
to do a cat here and this is important

689
00:43:05,091 --> 00:43:08,113
because anybody ever implement the copy
method incorrectly

690
00:43:09,013 --> 00:43:13,015
and doesn't return and if they're we
would much rather find out about it

691
00:43:13,033 --> 00:43:16,037
right here in the initial either then
crashed somewhere down the line we try

692
00:43:16,073 --> 00:43:16,135
to you that

693
00:43:17,035 --> 00:43:21,071
on the other hand we can just to find
the type directly

694
00:43:21,071 --> 00:43:24,079
and this is because touring in swept
r-value

695
00:43:25,051 --> 00:43:29,136
unlike in a string every fourth string
has an independent existence

696
00:43:30,036 --> 00:43:34,038
and when you find across the vehicle
operator you get independent string

697
00:43:34,056 --> 00:43:38,112
so whenever somebody dead over here to
there string want to pack your string

698
00:43:39,012 --> 00:43:46,012
over here the next inning to implement
the end up cutting protocol

699
00:43:47,038 --> 00:43:50,130
because this for a bit more room and
here we can code

700
00:43:51,003 --> 00:43:54,004
that complete here Naoko completion

701
00:43:54,004 --> 00:43:56,623
of them

702
00:43:57,019 --> 00:44:00,630
so I here I'm in it I'm implementing the
end it's colder than it

703
00:44:00,063 --> 00:44:03,091
initializer and another something a
little funny here

704
00:44:03,091 --> 00:44:06,300
Anna in objective-c we have the method

705
00:44:07,119 --> 00:44:10,190
named in it with coder but in swift we
have an initializer

706
00:44:10,829 --> 00:44:15,400
that's it in it coder so in order for
more consistency in the

707
00:44:15,004 --> 00:44:19,143
Westworld where object recent contact
with a little different

708
00:44:19,539 --> 00:44:23,614
and in it method from objective-c that
starts with in knitwear

709
00:44:24,289 --> 00:44:27,364
will come into swept with the with
dropped

710
00:44:28,039 --> 00:44:35,039
this ensures a consistent world with
objective-c security implementation that

711
00:44:35,014 --> 00:44:37,017
it's pretty much the same as what you'd
expect

712
00:44:37,017 --> 00:44:41,022
just called the code object for key and
again explicitly down capping to the

713
00:44:41,067 --> 00:44:42,006
type we want

714
00:44:42,609 --> 00:44:46,200
if somebody hands off the bat archive
will find out about it now

715
00:44:46,002 --> 00:44:51,671
rather than crashing later on finally
polite thing to do here

716
00:44:51,869 --> 00:44:54,893
is implement the in code with cutter
method and

717
00:44:55,109 --> 00:44:58,182
this one does not get any name changes
because that is limited

718
00:44:58,839 --> 00:45:03,880
specifically to initialize urs and
implementation this again is very simple

719
00:45:03,088 --> 00:45:06,307
we call in code object 40 with both the
data

720
00:45:07,099 --> 00:45:11,126
and the type and that's it this is an
entire

721
00:45:11,369 --> 00:45:16,420
with model object and get on one flied I
didn't do anything crazy are confusing

722
00:45:16,042 --> 00:45:16,651
here

723
00:45:17,029 --> 00:45:20,950
be on them and I think you need to do to
be a good Cocoa Touch they defend

724
00:45:20,095 --> 00:45:27,095
way the next step up quite the

725
00:45:28,094 --> 00:45:31,140
added into our object graph I go back to
our objective the header

726
00:45:32,004 --> 00:45:36,673
now ever been a problem because last
time that we want to act sex swift code

727
00:45:37,069 --> 00:45:37,140
from objected

728
00:45:37,779 --> 00:45:41,833
see what we did import generated header
into the Pride into the

729
00:45:42,319 --> 00:45:46,400
objected to the file we can't do that
here because the generated header

730
00:45:46,004 --> 00:45:49,123
depends on the swept and the swept read

731
00:45:49,519 --> 00:45:52,930
the entire public content of our
framework by the umbrella header

732
00:45:52,093 --> 00:45:55,175
and that includes this header right here
so instead

733
00:45:56,075 --> 00:46:00,104
I you think that with a mechanism that I
have an objective feet this is what we

734
00:46:00,779 --> 00:46:01,782
used to break cycle

735
00:46:01,809 --> 00:46:05,861
if they forward declaration using
Acrobat and I can forward acquire the

736
00:46:06,329 --> 00:46:10,500
first class just like I would any
objective c-class and now

737
00:46:10,005 --> 00:46:14,294
I am perfectly able to create a property
here using the attachment

738
00:46:14,789 --> 00:46:17,890
the last thing to do

739
00:46:17,089 --> 00:46:20,173
apart is to update the implementation on
the list item to actually

740
00:46:21,073 --> 00:46:24,140
handle the attachment and for that I'm
going to import generated header

741
00:46:25,004 --> 00:46:29,006
now that wouldn't in a dot on file and
because this is a framework

742
00:46:29,042 --> 00:46:33,241
and the generated header is part of our
public interface we are going to use

743
00:46:33,619 --> 00:46:35,170
framework syntax to imported

744
00:46:35,017 --> 00:46:39,956
all that what to do here now is to
update the implementation in this class

745
00:46:40,109 --> 00:46:42,710
so that we actually handle this new
property

746
00:46:42,071 --> 00:46:45,420
so that means having an x-ray he for
encoding here

747
00:46:46,059 --> 00:46:49,115
setting the attachment

748
00:46:49,619 --> 00:46:55,717
X explicitly to now making sure that we
can encode and decode it

749
00:46:56,599 --> 00:47:00,650
and while I'm doing that i'd like you
all to know that this is exactly what

750
00:47:00,065 --> 00:47:00,984
you'd be doing

751
00:47:01,569 --> 00:47:04,574
if we implemented the attachment quite
in objective-c there's nothing

752
00:47:05,069 --> 00:47:08,116
surprising going on here it's exactly
what you would have done before

753
00:47:08,539 --> 00:47:11,980
finally

754
00:47:11,098 --> 00:47:14,147
we do need to make sure that we have the
copy method for that with me copia with

755
00:47:15,047 --> 00:47:15,586
item

756
00:47:16,009 --> 00:47:21,200
that we actually do you get a copy of
the attachment as well square bracket

757
00:47:21,002 --> 00:47:25,004
and since women are attachment immutable

758
00:47:25,022 --> 00:47:29,151
using that like keyword to define the
properties we can just the sign of the

759
00:47:29,349 --> 00:47:30,400
Cross directly

760
00:47:30,004 --> 00:47:33,006
we don't need to do anything for copying
to ensure that they are

761
00:47:33,042 --> 00:47:36,138
independent and not going to change on a
so that that

762
00:47:37,038 --> 00:47:40,167
at the entire model and now you're
probably thinking

763
00:47:40,509 --> 00:47:44,490
so great here we go again back today
Interface Builder to define a new layout

764
00:47:44,049 --> 00:47:45,628
new control our and

765
00:47:46,069 --> 00:47:49,480
at a buncha out with an accent and hook
everything up all again where he thought

766
00:47:49,048 --> 00:47:49,677
that

767
00:47:50,109 --> 00:47:54,201
any be rape except that were actually
really lucky here

768
00:47:55,029 --> 00:47:59,030
the 30 but work in a department with
what about a gay people and another team

769
00:47:59,039 --> 00:47:59,980
is working on a very

770
00:47:59,098 --> 00:48:02,947
similar app that means to deal with
these kind of attachment and because

771
00:48:03,829 --> 00:48:05,852
they rapin new they've written entirely
in

772
00:48:06,059 --> 00:48:09,140
swept but they've also factored out
there

773
00:48:09,014 --> 00:48:12,091
attachment view controller into eight
separate framework

774
00:48:12,091 --> 00:48:15,190
which is a new feature in my life 8 so
we're going is their framework written

775
00:48:16,009 --> 00:48:17,044
entirely in sweat

776
00:48:18,025 --> 00:48:23,118
to implement the interface that deals
with this model object I'm

777
00:48:24,018 --> 00:48:27,367
to start up here I'm going to go to the
bottom here and check the plot

778
00:48:27,529 --> 00:48:33,470
yet another way to add me about to our
target to you had filed here

779
00:48:33,047 --> 00:48:36,356
I'm going to the media your folder to
select their project me give you our

780
00:48:36,779 --> 00:48:37,630
director prime

781
00:48:37,063 --> 00:48:40,097
want to have the in my project

782
00:48:40,097 --> 00:48:45,196
then I can just add this to our target
by going to our own project

783
00:48:46,069 --> 00:48:49,095
selecting the Leicester target and in
the embedded by an ear infection

784
00:48:49,329 --> 00:48:51,220
quitting the plot

785
00:48:51,022 --> 00:48:54,045
this what the at the framerate directly

786
00:48:54,045 --> 00:48:58,071
notice what we just did their is a new
feature IOSA

787
00:48:58,071 --> 00:49:01,170
to allow embedded framework course if
your Mac programmer

788
00:49:01,809 --> 00:49:05,816
you're probably used to this by now even
better framework need to be made

789
00:49:06,509 --> 00:49:08,160
available to Interface Builder

790
00:49:08,016 --> 00:49:12,965
two other classes in your project link
into your binary for you can actually

791
00:49:13,109 --> 00:49:14,200
run it

792
00:49:14,002 --> 00:49:17,005
and copied into the app so that when
other people down that they don't need

793
00:49:17,023 --> 00:49:19,312
to download the framework separately

794
00:49:19,519 --> 00:49:23,522
an extra texted all that for without
asking if the framework was written in

795
00:49:23,549 --> 00:49:24,650
objective-c

796
00:49:24,065 --> 00:49:31,065
or swept or mixture about

797
00:49:33,068 --> 00:49:37,417
coroner storyboard now convene out and
bring up the

798
00:49:38,029 --> 00:49:41,055
library here to bring out in you view
controller

799
00:49:41,289 --> 00:49:44,345
and in this case I'm going to set the
classes that you control or

800
00:49:44,849 --> 00:49:47,970
to be the media view controller from the
other framework you'll see the model

801
00:49:47,097 --> 00:49:48,172
feel care populate as well

802
00:49:49,072 --> 00:49:52,095
that be trips with to keep different
frame eyeglasses

803
00:49:52,095 --> 00:49:56,144
from stepping on each other at runtime
even without a prefect

804
00:49:57,044 --> 00:49:59,863
we don't need the view that Interface
Builder provides for us because it

805
00:50:00,259 --> 00:50:01,200
already has one

806
00:50:01,002 --> 00:50:04,080
in its own framework fighting just to be
back and now to make sure that we can

807
00:50:04,098 --> 00:50:05,207
actually get to that

808
00:50:06,089 --> 00:50:10,184
of what the tables out here and dragged
over control drag to create a new

809
00:50:11,039 --> 00:50:17,071
segue make that push that way and we'll
give that a name

810
00:50:17,359 --> 00:50:19,570
attachment

811
00:50:19,057 --> 00:50:23,065
now if that up Interface Builder we set
up the Interfaith and model object

812
00:50:23,065 --> 00:50:26,069
it's time to put them together and once
again we're going to the delegate for

813
00:50:27,005 --> 00:50:27,044
that

814
00:50:27,044 --> 00:50:31,047
but coach R objective-c code this is the
code that displays

815
00:50:31,074 --> 00:50:35,120
the with we at the top here we have been
notification center

816
00:50:36,002 --> 00:50:39,064
which is the system framework and the
import prolific at

817
00:50:39,082 --> 00:50:43,111
which is our own model framework within
this project I can add a third import

818
00:50:44,011 --> 00:50:47,014
for media your which is the free market
any other project

819
00:50:47,014 --> 00:50:51,030
men hit build again to make sure that
everything is compiled an up-to-date

820
00:50:51,003 --> 00:50:55,004
and now I get code completion for the
media your delegate protocol

821
00:50:55,031 --> 00:50:58,082
just like before

822
00:50:58,082 --> 00:51:01,631
gonna jump down to a nice communion
plate me application to implement this

823
00:51:02,369 --> 00:51:05,750
and the first thing I'm going to do
implant a little helper method here

824
00:51:05,075 --> 00:51:08,110
they just returned the selected item
again

825
00:51:09,001 --> 00:51:12,080
even though this is sordid details like
how the application currently work

826
00:51:12,089 --> 00:51:15,151
I want you to remember that everything
we're doing here is exactly what you do

827
00:51:16,051 --> 00:51:17,052
in objective-c

828
00:51:17,061 --> 00:51:20,080
from the perspective that this code you
can't really tell

829
00:51:20,008 --> 00:51:24,096
that the entire framework was written in
wept meaning a code completion for the

830
00:51:25,068 --> 00:51:26,077
delegate method here

831
00:51:26,077 --> 00:51:30,926
the view controller didn't use new media
type and now that we have all that set

832
00:51:31,619 --> 00:51:31,940
up

833
00:51:31,094 --> 00:51:34,142
it's really easy to add an attachment to
the currently selected item

834
00:51:35,042 --> 00:51:38,128
so here we say that its attachment

835
00:51:39,028 --> 00:51:42,120
is going to be a new attachment that we
create now by calling

836
00:51:43,002 --> 00:51:46,006
I like in it with their wait a second

837
00:51:46,006 --> 00:51:49,085
we define as attachment baton swept and
it had an initializer name

838
00:51:50,039 --> 00:51:53,106
in it datatype when injected see it's
showing up as

839
00:51:54,006 --> 00:51:59,050
in it with data type the see that this
name translation work but wait for you

840
00:51:59,005 --> 00:52:00,028
have a consistent world

841
00:52:00,073 --> 00:52:07,073
in sweat and in objective-c do better
housekeeping here to make sure that we

842
00:52:11,000 --> 00:52:12,045
update our back and start

843
00:52:12,045 --> 00:52:15,054
and now we have of everything set up
here all idk what to do

844
00:52:16,035 --> 00:52:19,046
just like dave did if that works out at
the delegate

845
00:52:19,046 --> 00:52:22,125
for the media view controller so the
start of the same week that the

846
00:52:23,025 --> 00:52:23,099
attachment

847
00:52:23,099 --> 00:52:27,180
and we set ourselves with the delegate
and then we can also set the title of

848
00:52:28,008 --> 00:52:29,020
the new controller

849
00:52:29,092 --> 00:52:32,104
and make sure that it's showing
attachment that actually

850
00:52:33,004 --> 00:52:37,323
on the selected item for if that's what
time does not have an attachment

851
00:52:37,359 --> 00:52:41,700
make sure that the controller isn't
showing anything so with that everything

852
00:52:41,007 --> 00:52:41,081
should be working

853
00:52:42,044 --> 00:52:48,283
but building run I'm

854
00:52:48,679 --> 00:52:51,746
going to the tech toy section here
anything now we have these disclosure

855
00:52:52,349 --> 00:52:53,394
indicators on each other

856
00:52:53,799 --> 00:52:58,823
be item going to find about this way
then I can see it says no attachment

857
00:52:59,039 --> 00:53:03,092
banquet with edit button using the view
controller from the media views premark

858
00:53:03,569 --> 00:53:06,621
that bring that standard I was control
making sure that our privacy is

859
00:53:07,089 --> 00:53:07,153
protected

860
00:53:07,729 --> 00:53:10,784
and this kid looks like he'd really
enjoy

861
00:53:11,279 --> 00:53:17,280
under will play K I we can go back to
another want to be here

862
00:53:17,289 --> 00:53:20,296
managed to get myself back anything
there we go

863
00:53:20,989 --> 00:53:24,072
and you can see that the image actually
does persist in the Thunderbolt Display

864
00:53:24,819 --> 00:53:31,819
Jackson so it looks like everything's
working I'm

865
00:53:33,006 --> 00:53:37,065
the thought he was not just deal with a
new model object are trying not to the

866
00:53:37,065 --> 00:53:38,150
new object in your application target

867
00:53:39,005 --> 00:53:42,057
but also in new model object in your
framework

868
00:53:43,002 --> 00:53:47,053
additionally this is not related to put
it all

869
00:53:47,053 --> 00:53:51,086
when I with a we now have embedded
premark an ex-convict will handle

870
00:53:51,086 --> 00:53:57,179
all the detail that for you death trap

871
00:53:58,079 --> 00:54:02,114
finally once again we updated our
interface and added a delegate adopted a

872
00:54:03,014 --> 00:54:04,030
delegate protocol

873
00:54:04,003 --> 00:54:09,027
and once again I wanna impress on you
that is exactly what we would have done

874
00:54:09,054 --> 00:54:13,100
had be delegate protocol and then view
controller been implemented in objective

875
00:54:14,000 --> 00:54:14,051
feet

876
00:54:14,051 --> 00:54:18,130
we didn't have to do anything unusual or
different because it was implemented in

877
00:54:18,589 --> 00:54:22,790
swept for you feel you did it with that
could take

878
00:54:22,079 --> 00:54:25,408
to you view their framework and in
general we want you to be tree node the

879
00:54:26,119 --> 00:54:27,900
theme that we do system framework

880
00:54:27,009 --> 00:54:30,023
Flemington where you'll be using import

881
00:54:31,004 --> 00:54:34,013
my free market an objective-c

882
00:54:34,013 --> 00:54:38,016
I'm using at import my premark semicon

883
00:54:38,043 --> 00:54:44,202
in general we do want you to be using at
important that it has to import

884
00:54:44,589 --> 00:54:48,591
for swift for free with containing swift
code this is absolutely required

885
00:54:48,609 --> 00:54:51,610
but even for other framework that
they've been bill would act could

886
00:54:51,619 --> 00:54:54,770
Dec and have a defined model bill
pending turned on

887
00:54:54,077 --> 00:54:57,656
which he is on by default then you have

888
00:54:58,349 --> 00:55:02,060
then you have a framework ready for you
in objected the or swept

889
00:55:02,006 --> 00:55:05,805
the only reason now you have to import
are if you are working with an older

890
00:55:05,859 --> 00:55:06,450
framework

891
00:55:06,045 --> 00:55:09,103
that have not yet been rebuilt with
Ecotec and defined model setting

892
00:55:10,003 --> 00:55:14,025
for you're working with the post what
which does not yet support model feature

893
00:55:14,025 --> 00:55:15,047
introduced last year

894
00:55:15,047 --> 00:55:19,081
so with that everything seems to be
working in our walk is complete and i

895
00:55:19,081 --> 00:55:19,090
cant a backhander

896
00:55:20,071 --> 00:55:27,071
thank you Jordan

897
00:55:29,045 --> 00:55:32,139
so over the past hour

898
00:55:33,039 --> 00:55:36,044
we've seen several different ways and
mixing swift

899
00:55:36,044 --> 00:55:39,089
and objective-c Swift is a better

900
00:55:39,089 --> 00:55:42,818
safer way to do coke or development it
was designed to support

901
00:55:43,619 --> 00:55:46,760
the cocoa frameworks the Cocoa Touch

902
00:55:46,076 --> 00:55:49,142
idioms and the common patterns that we
are ready now

903
00:55:50,042 --> 00:55:53,096
it's still Coco and Cocoa Touch

904
00:55:53,096 --> 00:55:56,167
fun I last so that means that the
knowledge and experience that you've

905
00:55:57,067 --> 00:55:58,093
gained over the years

906
00:55:58,093 --> 00:56:02,119
tenneco you have apply to swift as well
and as we've seen

907
00:56:03,019 --> 00:56:07,044
some other patterns such as actually
calling a delegate method

908
00:56:07,044 --> 00:56:11,117
are much easier and swept and much more
suspect and in other cases you've seen

909
00:56:12,017 --> 00:56:12,102
how swift

910
00:56:13,002 --> 00:56:16,321
makes us to find our intentions much
more clearly

911
00:56:16,339 --> 00:56:20,367
which can help save us later on so we
don't just accidentally message naylor

912
00:56:20,619 --> 00:56:25,240
message in object to the wrong type and

913
00:56:25,024 --> 00:56:28,048
another thing that I hope you've seen
here's we put a lot of effort into

914
00:56:28,048 --> 00:56:30,073
making sure that Xcode take care the
details

915
00:56:30,073 --> 00:56:33,164
so that when you're using objective-c
your swift code

916
00:56:34,064 --> 00:56:38,113
looks like objective-c and when you
using SwiftKey objective-c code looks

917
00:56:39,013 --> 00:56:39,078
like swept

918
00:56:39,078 --> 00:56:42,169
and you saw some examples of some class
in Cocoa Touch

919
00:56:43,069 --> 00:56:46,120
classes but that equally placed your own
classes as well

920
00:56:47,002 --> 00:56:50,411
so for more information about this

921
00:56:50,609 --> 00:56:53,670
a there is of course the Swifts book I

922
00:56:53,067 --> 00:56:57,068
the iBooks bookstore but also especially
like to call attention to the using

923
00:56:57,077 --> 00:57:01,091
swift with cocaine objective-c document
that we have a developer Apple com

924
00:57:01,091 --> 00:57:04,154
Savile was a PDF file you can download
and read on your

925
00:57:05,054 --> 00:57:08,383
there I was device and it really goes
into

926
00:57:08,869 --> 00:57:13,060
a lot more details about this the summer
related sessions

927
00:57:13,006 --> 00:57:16,030
one of them in has already been but it's
on video

928
00:57:16,003 --> 00:57:19,100
the introduction to Swift a course later
on today there's going to be a session

929
00:57:20,027 --> 00:57:20,065
on

930
00:57:20,065 --> 00:57:24,120
in swift interoperability and DAP and
that goes into more the language detail

931
00:57:25,002 --> 00:57:25,401
so

932
00:57:25,599 --> 00:57:30,621
out to mix objective-c was swept there's
a great great session on creating modern

933
00:57:30,819 --> 00:57:32,170
collapse coming up

934
00:57:32,017 --> 00:57:35,074
and another one a building modern
framework so that you can make sure that

935
00:57:35,074 --> 00:57:36,146
you make a framework some better ball

936
00:57:37,046 --> 00:57:42,124
on iowa's and usable from swept thanks
unknown

937
00:57:43,024 --> 00:57:43,893
enjoy the rest of the week