Detect when the transition of a new pushed view ends

In an application built on top of Three20, how can I detect, after a new view is pushed, when the transition ends?

If I开发者_JS百科 use viewDidLoad, it's call when the view is loaded into memory, but the transition may has not started yet.

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Have you tried using viewDidAppear:(BOOL)animated {?

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Use

viewDidAppear:(BOOL)animated;

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If you've used UIView animation methods (pre-iOS4), you can use +setAnimationDidStopSelector: or if you've used the new block-based animation methods, you can use any of the methods that allow you to set a completion handler like this.