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,with event：UIEvent？) {
print(“touchesBegan”);
}
override func touchesMoved(_ touches：Set, with event：UIEvent？) {
print(“touchesMoved”);
}
override func touchesEnded(_ touches：Set,with event：UIEvent？){
print(“touchesEnded”);
}
override func touchesCancelled(_ touches：Set, with event：UIEvent？) {
print(“touchesCancelled”);
}
}