UIPanGestureRecognizer没有名为touchesBegan的成员

Question

我正在尝试将UIPanGestureRecognizer子类化,我想我可能会做一些愚蠢的事情.我试图覆盖UIPanGestureRecognizer从UIGestureRecognizer继承的方法时遇到错误.

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);
    }
}

这产生了这些错误

非常感谢您的帮助.

Answer 1

当前接受的答案并不完全正确,实际上,如果要子类化UIGestureRecognizer,则应导入UIGestureRecognizerSubclass.h头文件,该文件在https://developer.apple.com/library/ios/documentation/UIKit/Reference中有描述./UIGestureRecognizer_Class/index.html,请参阅子类注释部分.

与在Swift中一样,这可以作为流程完成:

import UIKit.UIGestureRecognizerSubclass

那你就准备好了.