Created
April 29, 2010 22:40
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// call when zoom level or page size changes (i.e. after zooming or after rotation) | |
- (void)updateContentInsetForPageScrollView:(UIScrollView *)pageScrollView { | |
UIImageView *imageView = (UIImageView *) [pageScrollView viewWithTag:TAG_IMAGE_VIEW]; | |
CGFloat zoomScale = pageScrollView.zoomScale; | |
CGSize imageSize = imageView.bounds.size; | |
CGSize zoomedImageSize = CGSizeMake(imageSize.width * zoomScale, imageSize.height * zoomScale); | |
CGSize pageSize = pageScrollView.bounds.size; | |
UIEdgeInsets inset = UIEdgeInsetsZero; | |
if (pageSize.width > zoomedImageSize.width) { | |
inset.left = (pageSize.width - zoomedImageSize.width) / 2; | |
inset.right = -inset.left; | |
} | |
if (pageSize.height > zoomedImageSize.height) { | |
inset.top = (pageSize.height - zoomedImageSize.height) / 2; | |
inset.bottom = -inset.top; | |
} | |
pageScrollView.contentInset = inset; | |
} | |
-(void)scrollViewDidZoom:(UIScrollView *)pageScrollView { | |
[self updateContentInsetForPageScrollView:pageScrollView]; | |
} | |
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation { | |
// loop through all pages, adjusting their sizes | |
// and calling updateContentInsetForPageScrollView for each | |
} |
Hey, watch “Session 104 - Designing Apps with Scroll Views” from WWDC 2010, they present even better way to achieve the same.
10 year old code but saved me so many nerves! Thanks a lot!
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Thank you so much, this brought an end to 1.5 days frustration trying to get uiscrollview to work right.