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class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view. let pan = UIPanGestureRecognizer(target: self, action: #selector(handlePanGesture)) pan.delegate = self view.addGestureRecognizer(pan) } } extension ViewController: UIGestureRecognizerDelegate { func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool { return true } } extension ViewController { @objc func handlePanGesture(_ sender: UIPanGestureRecognizer) { switch sender.state { case .possible: print("possible") case .began: print("began") case .changed: print("changed") case .ended: print("ended") case .cancelled: print("cancelled") case .failed: print("failed") @unknown default: break } print("alternate:", sender.modifierFlags.contains(.alternate)) print("command:", sender.modifierFlags.contains(.command)) print("control:", sender.modifierFlags.contains(.control)) print("shift:", sender.modifierFlags.contains(.shift)) } }