RecognizeGesturesBetweenScrollViewAndButton

ContainerView.m

/*
The layout (notice how button is 50% on top of the collection view
while still added to the ContainerView)

|----------------------------------------------------|
|                       ContainerView                |
|  ------------------------------------------------  |
|  |               CollectionView                 |  |
|  |                ___________                   |  |
|  |                |          |                  |  |
|  -----------------|  Button  |-------------------  |
|                   |          |                     |
|                   |__________|                     | 
|____________________________________________________|
*/
@implementation ContainerView {
  UICollectionView *_collectionView;
  UIControl *_closeButton;
}
  
- (void)makeUI {
  _collectionView = ... 
  [self addSubview:_collectionView];
    // Layout collectionView
  
  _closeButton = [[UIButton alloc] initWithFrame:CGRectZero];
  [_closeButton addTarget:self action: @selector(didPressButton)];
  [self addSubview:_closeButton];
  // Layout button
}

- (void)didPressButton {
  // perform actions
}

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
    UIView *hitView = [super hitTest:point withEvent:event];
    
    // This passes pan gestures to collection view but cannot handle tap gestures anymore
    if (hitView == _closeButton && _collectionView.panGestureRecognizer.state = UIGestureRecognizerStatePossible) {
        return _collectionView;
    }
    
    return hitView;
}
@end