ios - UIPanGestureRecognizer 没有名为 touchesBegan 的成员

Question

我正在尝试继承 UIPanGestureRecognizer，我想我可能在做一些愚蠢的事情。尝试覆盖 UIPanGestureRecognizer 从 UIGestureRecognizer 继承的方法时出现错误。

我有这个代码

class VPGesture: UIPanGestureRecognizer {
    override func touchesBegan(touches: NSSet!, withEvent event: UIEvent!) {
        super.touchesBegan(touches, withEvent: event)
    }

    override func touchesMoved(touches: NSSet!, withEvent event: UIEvent!) {
        super.touchesMoved(touches, withEvent: event);
    }

    override func touchesEnded(touches: NSSet!, withEvent event: UIEvent!) {
        super.touchesEnded(touches, withEvent: event);
    }

    override func touchesCancelled(touches: NSSet!, withEvent event: UIEvent!) {
        super.touchesCancelled(touches, withEvent: event);
    }
}

产生这些错误的地方

非常感谢您的帮助。

Answer 1

目前接受的答案不太正确，实际上，如果你想子类化一个 UIGestureRecognizer，你应该导入 UIGestureRecognizerSubclass.h 头文件，它在 https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIGestureRecognizer_Class/index.html 中描述，请参阅子类注释部分。

在 Swift 中，这可以按流程完成:

import UIKit.UIGestureRecognizerSubclass

然后你就可以开始了。