Scrolling issue

[Nilesh04]

Description

I am facing issue in iOS 11. As I am opening slackview, I am loading older messages. it is not scrolling to that last message at bottom. Means scrolling is not working.
Also When I am sending new message & keyboard is on the screen then new message doesn't scroll up. It is behind keyboard

[DavidNieuwsma]

[x] I've read and understood the Contributing guidelines and have done my best effort to follow them.
[x] I've read and agree to the Code of Conduct.
[x] I've searched for any related issues and avoided creating a duplicate issue.

I'm facing similar issues under iOS 11 - the last cell is under the input field.
I also have problem with cells disappearing if I scroll table view up or down, when using dequeueReusableCell. If I simply create a new cell instead then the cells don't disappear while scrolling.