UIScrollView resets contentSize

Why does a UIScrollView instance reset its contentSize (in my case to the frame, and screen, width) by the time the dele开发者_如何学运维gate scrollViewDidEndZooming:(UIScrollView *) aScrollView withView:(UIView *) aView atScale:(float) aScale gets called?

What should I do about this? For example, do I really need to remind the instance of its contentSize, perhaps in the layoutSubviews method?

I believe the delegate method you are looking for is

• (void)scrollViewDidZoom:(UIScrollView *)scrollView

It tells the delegate that the scroll view’s zoom factor changed.

http://developer.apple.com/library/ios/#DOCUMENTATION/UIKit/Reference/UIScrollViewDelegate_Protocol/Reference/UIScrollViewDelegate.html