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    <p>I found a strange undocumented behavior when rotating a paged <code>UIScrollView</code>.</p> <p>When the scrollview is positioned at the last page and the user changes the orientation, the OS scrolls the <code>UIScrollView</code> a few pixels back to compensate for the difference between height and width.</p> <p>Basically I received the following calls for any page.</p> <pre><code>willRotateToInterfaceOrientation:duration willAnimateRotationToInterfaceOrientation:duration: didRotateFromInterfaceOrientation: </code></pre> <p>And for the last page:</p> <pre><code>willRotateToInterfaceOrientation:duration scrollViewDidScroll: willAnimateRotationToInterfaceOrientation:duration: didRotateFromInterfaceOrientation: </code></pre> <p>That messed up with my pages too. The problem is that in <code>willRotate</code>, the bounds have not been updated by the OS yet, and in <code>willAnimate</code> you have the new bounds and can compute the new size, but it's too late...</p> <pre><code>- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration { CGSize tempSize = [self.pagingScrollView contentSize]; NSUInteger padding = abs(pagingScrollView.frame.size.width - pagingScrollView.frame.size.height); tempSize.width += padding; [self.pagingScrollView setContentSize:tempSize]; [...] } - (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation duration:(NSTimeInterval)duration{ CGSize newSize = ... // Compute new content size based on new orientation [self.pagingScrollView setContentSize:newSize]; } </code></pre> <p>This is just a workaround, but I spent countless hours on this issue and could not find an elegant solution.</p>
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    1. USRaphaël Mor
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