UILongPressGestureRecognizer sending action twice

Question

My Long Press Gesture Recognizer is causing its action event to be executed twice ?

I was trying to figure out a Warning: Attempt to present VC2 on VC1 whose view is not in the window hierarchy!

By using some println() tests, I found that my VC2 is being presented twice.

My VC2 presentation method:

P1long:UILongPressGestureRecognizer located on VC1's MainView

When long press done on P1 of VC1

@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() }
}

---

Console output:

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!

Why is my LongPress acting twice.

Answer 1

You should handle long press gesture recognizer's state. UILongPressGestureRecognizer's action invokes on it's state changes. So you are receiving it first time when state == UIGestureRecognizerStateBegan and second time when its UIGestureRecognizerStateEnded.

You need something like:

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