when to use “willChangeValueForKey” and “didChangeValueForKey”?

Question

I saw these lines in a demo project, but I couldn\'t understand why it did that.

[self willChangeValueForKey:@\"names\"];
[self didChangeValueForKey:@\"names\"];         


        

Answer 1

Posting this in July 2013, and it no longer seems to be necessary to call will/didChangeValueForKey. It seems to be taken care of automatically, even if you have a custom setter.