Question

我在子视图上有一个子视图。两者都附加了touchUpInside个侦听器。当用户按下孩子时，我希望孩子和父视图都响应此触摸事件。当用户仅按下父级时，我只希望触发父级侦听器。

我该怎么做？

我已经尝试在子视图中重写以下方法，但是在此处返回false会完全忽略该子事件。相反，如果我在子级中处理touch事件，则父级会忽略它。

override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
        return false
    }

Answer 1

如果两个视图都有子类，则可以覆盖UIView touchesBegan方法。如果您调用超级touchesBegan方法，那么当事件沿响应者链上行时，这应该会产生您想要的结果。（即，如果用户点击子视图，则孩子和父母的触摸事件都会响应）

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    super.touchesBegan(touches, with: event)
    print("TOUCHED")
}

Answer 2

快速示例...

点击“ innerView”，您将看到两个“接触开始”的调试打印。点击“ outerView”，您只会看到一个。

class TouchView: UIView {

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesBegan(touches, with: event)
        print("touches began in \(self)")
    }

}

class TouchTestViewController: UIViewController {

    let innerView: TouchView = {
        let v = TouchView()
        v.translatesAutoresizingMaskIntoConstraints = false
        v.backgroundColor = .red
        return v
    }()

    let outerView: TouchView = {
        let v = TouchView()
        v.translatesAutoresizingMaskIntoConstraints = false
        v.backgroundColor = .cyan
        return v
    }()

    override func viewDidLoad() {
        super.viewDidLoad()

        view.addSubview(outerView)
        outerView.addSubview(innerView)

        NSLayoutConstraint.activate([

            outerView.widthAnchor.constraint(equalToConstant: 300),
            outerView.heightAnchor.constraint(equalToConstant: 300),
            outerView.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            outerView.centerYAnchor.constraint(equalTo: view.centerYAnchor),

            innerView.widthAnchor.constraint(equalToConstant: 150),
            innerView.heightAnchor.constraint(equalToConstant: 150),
            innerView.centerXAnchor.constraint(equalTo: outerView.centerXAnchor),
            innerView.centerYAnchor.constraint(equalTo: outerView.centerYAnchor),

            ])

    }

}

响应孩子和父母的触摸事件

2 个答案: