Reodering gesture used for controlling drag and drop feature in UICollectionView

ReoderGesture.swift

fileprivate var longPressGesture: UILongPressGestureRecognizer!

override func viewDidLoad() {
    super.viewDidLoad()
    longPressGesture = UILongPressGestureRecognizer(target: self, action: #selector(self.handleLongGesture(gesture:)))
    reorderCollectionView.addGestureRecognizer(longPressGesture)
}


@objc func handleLongGesture(gesture: UILongPressGestureRecognizer) {
    switch(gesture.state) {
        
    case .began:
        guard let selectedIndexPath = reorderCollectionView.indexPathForItem(at: gesture.location(in: reorderCollectionView)) else {
            break
        }
        reorderCollectionView.beginInteractiveMovementForItem(at: selectedIndexPath)
    case .changed:
        reorderCollectionView.updateInteractiveMovementTargetPosition(gesture.location(in: gesture.view!))
    case .ended:
        reorderCollectionView.endInteractiveMovement()
    default:
        reorderCollectionView.cancelInteractiveMovement()
    }
}