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Avoiding KVO in dealloc?

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Avoiding KVO in dealloc?

Subject: Avoiding KVO in dealloc?
From: Todd Heberlein <email@hidden>
Date: Mon, 03 Aug 2009 16:35:12 -0700

While working through "Beginning iPhone 3 Development" I've seen the following a lot, and it seems like a general Cocoa issue.

In -viewDidUnload methods the code has the form:
	self.foo = nil;

Whereas in -dealloc methods the code has the form:
	[foo release];

Both methods seem to me to do the same thing (releasing foo), but I presume the first one would trigger any KVO observers where as the second wouldn't. Is that why the simple "release" is used instead of a setter in the dealloc methods, to avoid KVO? Is this a general Cocoa pattern?

Thanks,

Todd

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