UILongPressGestureRecognizer两次发送动作

Question

我的长按手势识别器导致其动作事件执行两次 ？

我试图找出Warning: Attempt to present VC2 on VC1 whose view is not in the window hierarchy!

通过使用一些println（）测试，我发现我的VC2被呈现了两次。

我的VC2演示方法：

P1long：位于VC1主视图上的UILongPressGestureRecognizer

在VC1的P1上长按

@IBAction func PresentPlayerInfo(sender: UIGestureRecognizer){
    var loc = sender.locationInView(self.view)
    var segueSwitch = 0

    if (CGRectContainsPoint(self.P1.frame, lock)) 
        { tappedView = self.P1; segueSwitch = 1 }
    else if (CGRectContainsPoint(self.ReDeal.frame, lock)) 
        { tappedView = self.ReDeal; segueSwitch = 2 }

    if segueSwitch == 1
        { performSegueWithIdentifier("PlayersTable", sender: self)
        println("PlayersTable") }

    else if segueSwitch == 2 
        { self.viewDidLoad() }
}

控制台输出：

PlayersTable PlayersTable Warning: Attempt to present <iPro_Poker_HH_swift.VC2: 0x14555470> on <iPro_Poker_HH_swift.VC1: 0x153a2600> whose view is not in the window hierarchy!

为什么我的LongPress会两次表演。

Answer 1

你应该处理长按手势识别器的状态。 UILongPressGestureRecognizer的动作会调用它的状态变化。所以你第一次收到state == UIGestureRecognizerStateBegan，第二次收到它的UIGestureRecognizerStateEnded。

您需要以下内容：

if (recognizer.state == UIGestureRecognizerStateEnded)
{
    //your action
}