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With What does Apple Swizzle the IsA-pointer in KVO?

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With What does Apple Swizzle the IsA-pointer in KVO?

Subject: With What does Apple Swizzle the IsA-pointer in KVO?
From: Philip Mötteli <email@hidden>
Date: Fri, 23 Nov 2007 14:42:32 +0100

Hi,

Apple says, that it uses IsA-swizzling as the underlying technology to implement KVO. What are/is the class(es), which replace the original class of the observed object? Is it an NSProxy subclass? Different NSProxy subclasses, depending on the observed object? Is it a direct subclass of the observed object?


Thanks
Phil
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