uiscrollviewdelegate

I need to closely monitor the scale of the scroll view so that I can update the content view's elements (a subview managing multiple CALayers ) according to the scroll view's animated zoom. On iOS 3.1, everything works as expected, I use zoomToRect:animated: and the scrollViewDidScroll: message of the UIScrollViewDelegate gets called repeatedly while the animation takes place , letting me update the subview elements according to actual zoom. The same code on iOS 4.0 does not exibit the same behavior. When I call zoomToRect:animated: , the delegates ( scrollViewDidScroll: and scrollViewDidZoom

Is there a way to detect or get a notification when user changes the page in a paging-enabled UIScrollView? Implement the delegate of UIScrollView. This method is what you are looking for. - (void)scrollViewDidScroll:(UIScrollView *)scrollView Use this to detect which page is currently being shown and perform some action on page change: - (void)scrollViewDidScroll:(UIScrollView *)scrollView { static NSInteger previousPage = 0; CGFloat pageWidth = scrollView.frame.size.width; float fractionalPage = scrollView.contentOffset.x / pageWidth; NSInteger page = lround(fractionalPage); if (previousPage

I know the Apple documentation has the following delegate method: - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView; // called when scroll view grinds to a halt However, it doesn't necessarily mean you are at the bottom. Cause if you use your finger, scroll a bit, then it decelerates, but you are not actually at the bottom of your scroll view, then it still gets called. I basically want an arrow to show that there is more data in my scroll view, and then disappear when you are at the bottom (like when it bounces). Thanks. I think what you might be able to do is to check that your

I've got a a few UIScrollView on a page. You can scroll them independently or lock them together and scroll them as one. The problem occurs when they are locked. I use UIScrollViewDelegate and scrollViewDidScroll: to track movement. I query the contentOffset of the UIScrollView which changed and then reflect change to other scroll views by setting their contentOffset property to match. Great.... except I noticed a lot of extra calls. Programmatically changing the contentOffset of my scroll views triggers the delegate method scrollViewDidScroll: to be called. I've tried using setContentOffset