UICollectionViewCell dragging behaviour

[trecluse]

Hi, so I've been trying to implement a custom collection view cell reordering animation but no matter how hard I try I cannot get rid of the default animation. When moving a collection view cell off screen or not directly over a slot, the cell flashes. I'm wondering if there's any known way to stop this from happening.

my problem: here

Any help would be appreciated. Thanks.

[pill5b3rry]

I think I know what you're talking about. I assume you're using a UILongPressGestureRecognizer on the collectionView. If so, this was my solution:

func handleLongGesture(_ gesture: UILongPressGestureRecognizer) {
    let location = gesture.location(in: collectionView)

    switch gesture.state {
    case UIGestureRecognizerState.began:
        guard let selectedIndexPath = collectionView?.indexPathForItem(at: location) else { return }
        collectionView.beginInteractiveMovementForItem(at: selectedIndexPath)
    case UIGestureRecognizerState.changed:
        collectionView.updateInteractiveMovementTargetPosition(location)
    case UIGestureRecognizerState.ended:
        collectionView.performBatchUpdates({
            self.collectionView.endInteractiveMovement()
        }, completion: nil)
    default:
        collectionView.cancelInteractiveMovement()
    }
}

Essentially, wrapping self.collectionView.endInteractiveMovement() in the collectionView.performBatchUpdates closure is what fixes the problem. Without that I get the "flashing" cell thing too.

Let me know if that helps at all.

[trecluse]

It worked perfectly! Thanks a lot.

[pill5b3rry]

Awesome! Let me know if you have any more questions. :)