when to use "willChangeValueForKey" and "didChangeValueForKey"?
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by Frost Li
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Published on 2010-06-10T20:28:49Z
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2010/06/10
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objective-c
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I saw these lines in a demo project, but I couldn't understand why it did that.
[self willChangeValueForKey:@"names"];
[self didChangeValueForKey:@"names"];
It called didChangeValueForKey immediately after willChangeeValueForKey. Does it make any sense?
Furthermore, when should be the right time to call this two methods? Thanks a lot!! :)
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