IOS UIResponder 触屏

触屏类四个方法：

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class ViewController：UIViewController { override func viewDidLoad() { super.viewDidLoad() } override func touchesBegan(_ touches：Set<UITouch>,with event：UIEvent？) { print(“touchesBegan”); } override func touchesMoved(_ touches：Set<UITouch>, with event：UIEvent？) { print(“touchesMoved”); } override func touchesEnded(_ touches：Set<UITouch>,with event：UIEvent？){ print(“touchesEnded”); } override func touchesCancelled(_ touches：Set<UITouch>, with event：UIEvent？) { print(“touchesCancelled”); } }