In the iPhone 3.0 SDK, how can I be informed when a zoomToRect:animated: animation completes?
Sometimes the scrollview doesn't zoom at all (if it's already at the proper zoom level), and there doesn't seem to be a way to detect that.
views:
475answers:
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+4
A:
On your delegate, you can listen for - (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale
see UIScrollView and UIScrollViewDelegate
slf
2009-09-14 17:31:49
Doesn't work if it doesn't actually zoom.
Adam Ernst
2009-09-18 03:47:21
You shouldn't be calling zoomToRect if you don't have to zoom. Use the zooming, zoomBouncing, and zoomScale properties of your scrollview to detect that
slf
2009-09-18 13:12:58
https://developer.apple.com/IPhone/library/samplecode/ScrollViewSuite/index.html
slf
2009-09-18 13:13:46
+1
A:
The easiest way would probably to put in a check before starting the animation. If the zoom level is already correct, call [self performSelectorOnMainThread:@selector(myMethod) withObject:id waitUntilDone:NO].
You won't be able to use the same method as scrollViewDidEndZooming, because you can only pass one argument, but it will trigger an asynchronous call on the main thread
Douglas Mayle
2009-09-16 07:10:21