uicollectionview - UICollectionViewCell with UIScrollView cancels didSelectItemAtIndexPath

Question

I have a UICollectionView that horizontally scrolls to show one UICollectionViewCell at a time. Each UICollectionViewCell the has a vertically scrolling UIScrollView as subview for scrolling the contents of the cell. It is only 90 % or so of the inner part of the UICollectionViewCell that is covered by the UIScrollView - i.e. the outer frame of the cell is not covered by this.

It turns out that the part of the UICollectionViewCell that is covered by the UIScrollViewcancels the UICollectionView delegate didSelectItemAtIndexPath. Thus when a simple tap happens within the UIScrollView this method is not invoked, whereas if the tap happens on the outer part of the cell, i.e. outside the UIScrollView, this method is invoked.

Any suggestions as to how to achieve a setup where it is possible to invoke the didSelectItemAtIndexPath method even when the tap happens within the UIScrollView?

Answer 1

I found that the most effective approach is to steal the panGestureRecognizer, exposed by UIScrollView and disable userInteraction on the scrollView. That way, you get the behavior of the scrollview but maintain the interaction on the collection view. On your UICollectionViewCell subclass:

self.scrollView.userInteractionEnabled = NO;
[self.contentView addGestureRecognizer:self.scrollView.panGestureRecognizer];

This is a method Apple recommends and demonstrates in WWDC 2014 session 235 (Advanced Scrollviews and Touch Handling Techniques)