Gesture recognizor on UICollectionView not receiving gestures

Question

I have a ViewController with a vertically scrolling collection view that takes up the entire view. I want to be able to get swipe and pan gestures on the entire collection view (not just on cells) but I can't get any gestures. I have tried adding the gesture recognizer to the view and the collection view but neither seem to work.

Adding the gesture recognizer to the view

self.panEdgeGesture = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
self.panEdgeGesture.delegate = self;
[self.collectionView addGestureRecognizer:self.panEdgeGesture];
[self.panEdgeGesture setEdges:UIRectEdgeRight];

Then I added these functions:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
   shouldReceiveTouch:(UITouch *)touch{

   return YES;
}

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
    return YES;
}

- (void)handlePan:(UISwipeGestureRecognizer *)sender 
{
 DebugLog(@"Received pan gesture");
}

Could the collection view cells stop the gesture events from triggering? They have no gestures themselves.

beyowulf beyowulf · Accepted Answer · 2016-03-11T23:12:16

Per UIScreenEdgePanGestureRecognizer's Class Reference:

After creating a screen edge pan gesture recognizer, assign an appropriate value to the edges property before attaching the gesture recognizer to your view. You use this property to specify from which edges the gesture may start. This gesture recognizer ignores any touches beyond the first touch.

So change you code to:

self.panEdgeGesture = [[UIScreenEdgePanGestureRecognizer alloc];
[self.panEdgeGesture setEdges:UIRectEdgeRight];
initWithTarget:self action:@selector(handlePan:)];
self.panEdgeGesture.delegate = self;
[self.collectionView addGestureRecognizer:self.panEdgeGesture];

Gesture recognizor on UICollectionView not receiving gestures

1 Answers