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I have a long, horizontal, narrow UIScrollView containing several buttons side-by-side. When a user drags a button vertically, a specific method is triggered (via a UIPanGestureRecognizer), and the scrollview doesn't scroll (even if his/her drag begins to go left or right). This is all good.

When a user drags horizontally anywhere on the scrollview, including directly on a button, the UIPanGestureRecognizer ignores the effect and the scrollview should scroll. It's the last effect I'm having trouble with: when the user horizontally drags directly on a button, the scrollview doesn't scroll. How can I "pass through" that horizontal gesture to the scrollview?

Thanks for reading!

Stunner
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Rogare
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3 Answers3

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Add this method to your buttons' UIPanGestureRecognizer's delegate:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return (otherGestureRecognizer == _scrollView.panGestureRecognizer);
}
hatfinch
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  • That's _exactly_ what I needed. Thanks! All of my angle-calculating functions are no longer necessary. I'll just disable scrolling at the start of the vertical-button-drag and enable afterwards. – Rogare Nov 14 '13 at 12:17
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On UIScrollView you can override 

- (BOOL)touchesShouldCancelInContentView:(UIView *)view

Subclass UIScrollView (or UITableView) and return YES. It will cancel any touch from subviews when scrolling starts.

Aurelien Cobb
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0

Give a thought to UILongPressGestureRecognizer. This might help you: Combine longpress gesture and drag gesture together

Community
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instaable
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