swift - 在 swift 中实现手势识别器后，如何找到按钮标签？

Question

我希望有人在按钮内滑动时执行一次操作。

我目前的代码如下:

    let recogniser = UISwipeGestureRecognizer(target: self, action: "didTapButton2:")
    recogniser.direction = .Up
    button.addGestureRecognizer(recogniser)

    func didTapButton2(sender: UIGestureRecognizer!) {

    //Here I want to be able to recognise which button this was sent from (they are all tagged)
    let button = sender. as UIButton //Gives an error

我需要使用手势识别器而不是 UIControlEvents，因为我需要事件只触发一次。使用它会使事件触发很多次——只需要它发生一次:

    button.addTarget(self, action: "didTapButton2:", forControlEvents: .TouchDragInside)

有人有解决办法吗？谢谢

Answer 1

UIGestureRecognizer 有一个名为 view 的属性，它是它附加到的 View 。 View 被声明为可选的，所以你需要打开它:

if let button = sender.view as? UIButton {
    // use button
    if button.tag == 10 {
        // handle button tagged with 10
    }
}