UILongPressGestureRecognizer兩次發送動作

Question

我的長按手勢識別器導致其動作事件被執行兩次 ？

我試圖找出一個Warning: Attempt to present VC2 on VC1 whose view is not in the window hierarchy!

通過使用一些println（）測試，我發現我的VC2被呈現兩次。

我的VC2演示方法：

P1long：UILongPressGestureRecognizer位於VC1的MainView上

在VC1的P1上長按完成時

@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() }
}

---

控制台輸出：

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!

為什么我的LongPress會兩次表演。

Answer 1

您應該處理長按手勢識別器的狀態。 UILongPressGestureRecognizer的動作調用它的狀態變化。 所以你第一次收到state == UIGestureRecognizerStateBegan，第二次收到它的UIGestureRecognizerStateEnded。

你需要這樣的東西：

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