如何在swift中实现手势识别器后找到按钮标签？

Question

当有人在按钮内滑动时，我想要执行一次操作。

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，因为我只需要触发一次事件。使用它会使事件发生火灾次数 - 只需要进行一次：

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

有没有人有解决方案？感谢

Answer 1

UIGestureRecognizer有一个名为view的属性，它是附加到的视图。视图被声明为可选，因此您需要打开它：

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