IOS 开发之swift中手势的实例详解

// 长按
let label = UILabel(frame: CGRectMake(10.0, 10.0, (self.view.frame.size.width - 10.0 * 2), 60.0))
self.view.addSubview(label)
label.backgroundColor = UIColor.lightGrayColor()
label.text = "手势操作-长按手势";
label.adjustsFontSizeToFitWidth = true
label.textAlignment = .Center;
// 添加手势
let pressRecognizer = UILongPressGestureRecognizer(target: self, action: Selector("pressClick:"))
    pressRecognizer.minimumPressDuration = 3.0
    label.userInteractionEnabled = true
    label.addGestureRecognizer(pressRecognizer)

// 手势响应方法
func pressClick(recognizer:UILongPressGestureRecognizer)
{
    let label:UILabel = recognizer.view as! UILabel

    if recognizer.state == .Began
    {
      let alertView = UIAlertView(title: nil, message: "长按响应", delegate: nil, cancelButtonTitle: "知道了")
      alertView.show()

      label.backgroundColor = UIColor.orangeColor()
      self.view.bringSubviewToFront(label)
    }
    else if recognizer.state == .Ended
    {
      label.backgroundColor = UIColor.lightGrayColor()
    }
}