UITapGestureRecognizer没有在Swift 3中触发

问题描述：

我在自定义 UIViewController 中有以下代码：

I have the following code in a custom UIViewController:

let tapDismissTextField = UITapGestureRecognizer(target: self, action: #selector(dismissTap))

func dismissTap() {

    print("Tap!")
}

override func viewDidLoad() {
    super.viewDidLoad()

    self.view.addGestureRecognizer(tapDismissTextField)
    self.friendsView.addGestureRecognizer(tapDismissTextField)
}

否点击！正在打印线条，因此手势识别器不会触发。可能出现什么问题？

No "Tap!" lines are being printed, so the gesture recogniser isn't firing. What could be going wrong?

在此控制器的所有视图中启用的用户交互 true 。

User Interaction Enabled is true accross all the views in this controller.

如果有任何帮助，这个视图控制器嵌入在 UINavigationController 中。

This view controller is embedded within a UINavigationController if that is of any help.

答

您需要分配一次你的看法被载入自

You need to assign self only once your view is loaded.

var tapDismissTextField: UITapGestureRecognizer!

并在你的viewDidLoad方法中：

and in your viewDidLoad method:

override func viewDidLoad() {
    super.viewDidLoad()
    tapDismissTextField = UITapGestureRecognizer(target: self, action: #selector(dismissTap))
    view.addGestureRecognizer(tapDismissTextField)
}

UITapGestureRecognizer没有在Swift 3中触发

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