UIGesturerecognizer 不适用于 UIView

Question

当我点击 UIView 但手势不起作用时。

override func viewDidLoad() {
        super.viewDidLoad()

        let tap = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(_:)))
        viewForSHadow.isUserInteractionEnabled = true
        viewForSHadow.addGestureRecognizer(tap)

        // Do any additional setup after loading the view.
    }


func handleTap(_sender: UITapGestureRecognizer) {
        print("---------View Tapped--------")
        viewForSHadow.isHidden = true
        viewForAlert.isHidden = true
    }

我只想在 UIView 点击时执行此操作。

Answer 1

你必须使用 UIGestureRecognizerDelegate

let tapRecognizer = UITapGestureRecognizer(target: self, action: #selector(handleDismiss))
        tapRecognizer.delegate = self
        blackView.addGestureRecognizer(tapRecognizer)

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
    return true
}

@objc func handleDismiss() {
        print("handleDismiss")
}

Reference

不要忘记在你的类中设置 UIGestureRecognizerDelegate

Answer 2

首先，您的代码无法编译。 handleTap(_:) 签名必须是这样的：

@objc func handleTap(_ sender: UITapGestureRecognizer) {
    print("---------View Tapped--------")
}

其次，您需要先尝试在单独的项目中使用最少的代码。我所说的最少代码是指您在问题中添加的内容。

class ViewController: UIViewController {
    @IBOutlet weak var viewForSHadow: UIView!

    override func viewDidLoad() {
        super.viewDidLoad()
        let tap = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(_:)))
        viewForSHadow.addGestureRecognizer(tap)
    }

    @objc func handleTap(_ sender: UITapGestureRecognizer) {
        print("---------View Tapped--------")
    }
}

试试上面的代码，看看你能不能让它工作。上面的代码在我没有任何delegate 或numberOfTaps 的情况下运行良好。

Answer 3

如果有 alpha = 0 的任何内容与您的 viewForSHdow 重叠，您可以检查 调试视图层次结构。

Answer 4

您需要提及UITapGestureRecognizer 的numberOfTapsRequired 属性。

override func viewDidLoad() {
    super.viewDidLoad()
    let tap = UITapGestureRecognizer(target: self, action: #selector(handleTapGesture(_sender:)))
    tap.numberOfTapsRequired = 1
    viewForSHadow.isUserInteractionEnabled = true
    viewForSHadow.addGestureRecognizer(tap)
}

@objc func handleTapGesture(_sender: UITapGestureRecognizer) {
    print("---------View Tapped--------")
    // Why are you hiding this view **viewForSHadow**
    viewForSHadow.isHidden = true
    viewForAlert.isHidden = true
}

另外，请确保您没有在代码中的任何位置使用viewForSHadow.isUserInteractionEnabled = false。

Answer 5

您的代码足以让 UIGestureRecognizer 正常工作，您应该检查其他一些东西，例如，是否有其他东西可以消耗用户交互。并且还要检查你是否使用

isUserInteractionEnabled = false

到 viewForSHAdow 的一些父视图。

Answer 6

你必须实现如下：

    class ViewController: UIViewController, UIGestureRecognizerDelegate {

...

    override func viewDidLoad() {
        super.viewDidLoad()
        let tap = UITapGestureRecognizer(target: self, action: #selector(handleTap(_sender:)))
        viewForSHadow.isUserInteractionEnabled = true
        viewForSHadow.addGestureRecognizer(tap)
    }

    @objc func handleTap(_sender: UITapGestureRecognizer) {
        print("---------View Tapped--------")
        viewForSHadow.isHidden = true
        viewForAlert.isHidden = true
    }
...

}