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PONested UIScrollViews
 

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  1. PONested UIScrollViews
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    <p>I have a mainScrollView scrolling horizontally with photos added to it and mainScrollView's contentSize is set according to the number of photos. </p> <p>To achieve the effect of scrolling to the end and swiping in a UIView with display info for user, I added the overlayScrollView to mainScrollView's subviews. </p> <p>overlayScrollView contains the contentView positioned outside the frame.</p> <pre><code>CGRect frame = self.mainScrollView.frame; frame.origin.x = CGRectGetWidth(frame) * (count-1); UIScrollView *overlayScrollView = [[UIScrollView alloc] initWithFrame:frame]; [self.mainScrollView addSubview:overlayScrollView]; // moves contentView one frame beyond frame.origin.x = CGRectGetWidth(frame); UIView *contentView = [[UIView alloc] initWithFrame:frame]; contentView.backgroundColor = [UIColor redColor]; [overlayScrollView addSubview:contentView]; overlayScrollView.contentSize = CGSizeMake(overlayScrollView.frame.size.width * 2, overlayScrollView.frame.size.height); overlayScrollView.pagingEnabled = YES; </code></pre> <p>I searched through SO on nested UIScrollViews and so subclassed UIScrollView for mainScrollView with the following method: </p> <pre><code>- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event { for (UIView *child in self.subviews){ if([child isMemberOfClass:[UIScrollView class]]) if(CGRectContainsPoint(child.frame, point)) return child; } return self; } </code></pre> <p>But it doesn't work. My code could be wrong. hitTest did return child (overlayScrollView) but did not scroll. Any suggestions how to code this?</p>
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    1. USchongsj
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    1. CODoes the user ever actually pan the scroll view? Could you achieve the effect you want with one scroll view and an animation on the frame of another view?
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      1. PONested UIScrollViews
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    2. COYes it works with only one photo - both scrollviews are within the same frame, mainScrollView is not scrolling and contentView slides in.
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