swift - UIGestureRecognizer 没有响应 swift 3.0

Question

当我在 View 上平移时，它没有反应。以下代码显示了我如何设置手势识别器。我的代码有什么问题？

class MyViewController : UIViewController {
    override func loadView() {
        self.view.addGestureRecognizer(gestureRecognizerForSetCardFace)
    }

    var gestureRecognizerForSetCardFace: UIPanGestureRecognizer = {
        let recognizer = UIPanGestureRecognizer(target: self, action: #selector(handleSetGesture(gesture:)))
        recognizer.maximumNumberOfTouches = 1
        return recognizer
    }()

     @objc func handleSetGesture(gesture: UIPanGestureRecognizer){
        print("pan")
    }
}

Answer 1

您正在覆盖 loadView。只有当您实际创建一个 View 并将其分配给 self.view 时，才应该覆盖它。

更改您的代码以覆盖 viewDidLoad。

override func viewDidLoad() {
    super.viewDidLoad()

    self.view.addGestureRecognizer(gestureRecognizerForSetCardFace)
}