Open Radar

 
Summary:

It's very hard to create smooth chained animations when many methods that animate views do not have a completion handler.


Steps to Reproduce:

Try to write code that calls -[UIScrollView scrollRectToVisible:rect animated:YES] and does something exactly when the scroll view finishes scrolling. You can either handle -[scrollViewDidEndScrollingAnimation:] (ugly, the code is completely disconnected from the original animation) or figure out how long the standard animation takes and do dispatch_after (even uglier, how long it takes is not documented and it _will_ change eventually, etc).


Expected Results:

[self.scrollView scrollRectToVisible:rect animated:YES completion:^() {
	// do something when the animation finishes
}];