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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<a href="http://developer.apple.com/">ADC Home</a> > <a href="../../referencelibrary/index.html">Reference Library</a> > <a href="../../samplecode/index.html">Sample Code</a> > <a href="../../samplecode/Cocoa/index.html">Cocoa</a> > <a href="../../samplecode/Cocoa/idxObjectiveCLanguage-date.html">Objective-C Language</a> > <A HREF="javascript:location.replace('index.html');">MethodReplacement</A> >
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<p><strong><a href="MethodReplacement.zip">Download Sample</a></strong> (“MethodReplacement.zip”, 38.6K)<BR>
<strong><a href="MethodReplacement.dmg">Download Sample</a></strong> (“MethodReplacement.dmg”, 95.2K)</p>
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<!--googleon: index -->
<pre class="sourcecodebox">Sample Code for WWDC 2006 session 302.
Objective C 2.0 Compatible class_poseAs() replacement. This demonstrates how to
replace a method in an existing Objective C class, and how to call the old
version without having to store IMP function pointers in a global. The trick is
to define a category on the class whose method you want to replace. In the
category, declare and implement a method with the same signature as the
replaced method. In the +load method of the category, look up the original and
replacement methods using class_getInstanceMethod(), then call
method_exchangeImplementations(). Subsequent calls to the original method will
call the replacement method, and an apparently recursive call to the
replacement method will call the original method. Voila.
In this specific example, the method -[NSWindow sendEvent:] is being replaced
by the category method -[NSWindow (TestMethodReplacement)
TestMethodReplacement_sendEvent:]. Because the method implementations are
swapped, the call to [self TestMethodReplacement_sendEvent:] actually calls the
original -[NSWindow sendEvent:] implementation.</pre>
<!--googleoff: index -->
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