如何快速双击（而不是单击）收藏视图单元格？

Question

Right now, I have a bunch of messages in a collectionview cell. My code to single tap the cell right now is

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    print("Which cell: ", indexPath)
}

How do I make it such that this will only print if it is double tapped not single tapped?

Answer 1

You can add UITapGestureRecognizer in collection view.

  private var doubleTapGesture: UITapGestureRecognizer!
    func setUpDoubleTap() {
        doubleTapGesture = UITapGestureRecognizer(target: self, action: #selector(didDoubleTapCollectionView))
        doubleTapGesture.numberOfTapsRequired = 2
        collectionView.addGestureRecognizer(doubleTapGesture)
        doubleTapGesture.delaysTouchesBegan = true
    }

Call above method from your viewDidLoad as

override func viewDidLoad() {
        super.viewDidLoad()
        setUpDoubleTap()
    }

Then add Gesture selector method in your class

 @objc func didDoubleTapCollectionView() {
        let pointInCollectionView = doubleTapGesture.location(in: collectionView)
        if let selectedIndexPath = collectionView.indexPathForItem(at: pointInCollectionView) {
            let selectedCell = collectionView.cellForItem(at: selectedIndexPath)
            // Print double tapped cell's path
            print("Which cell: ", selectedIndexPath.row)
            print(" double tapped")
        }
    }

didDoubleTapCollectionView method will call only when you will double tap on collection view cell item.

I hope above example will solve your problem.

Answer 2

 override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "customCell", for: indexPath) as! customCell
    let tapCell = UITapGestureRecognizer(target: self, action: #selector(self.doubleTap(selectedIndex:)))
    tapCell.numberOfTapsRequired=2
    cell.tag=indexPath.row
    cell.addGestureRecognizer(tapCell)
    return cell
}

@objc func doubleTap(gesture: UITapGestureRecognizer){
    print("Selected Index Is", gesture.view?.tag)
}