Attempt to present GKGameCenterViewController on UIViewController whose view is not in the window hierarchy

Question

I am having troubles showing the Game Center leaderboard when the user presses a button on my SecondViewController (game over screen with score/top score). The UIbutton is ShowLeaderboard which you'll see below.

The error I get is:

Warning: Attempt to present <GKGameCenterViewController: 0x7fb1c88044a0> on <UIViewController: 0x7fb1c2624e90> whose view is not in the window hierarchy!

I have tried dismissing the view first but no matter what I do I can't just get the leaderboard view to show. Below is my SecondViewController code:

import UIKit
import GameKit

class SecondViewController: UIViewController, GKGameCenterControllerDelegate {


@IBOutlet var scoreLabel: UILabel!
@IBOutlet var HighScoreLabel: UILabel!
var receivedString: String = ""
var receivedHighScore: String = ""


override func viewDidLoad() {
    super.viewDidLoad()
    scoreLabel.text = receivedString
    HighScoreLabel.text = receivedHighScore

}


@IBAction func ShowLeaderboard(sender: UIButton) {
    dismissViewControllerAnimated(true, completion:nil)
    showLeader()
}


func showLeader() {
    var vc = self.view?.window?.rootViewController
    var gc = GKGameCenterViewController()
    gc.gameCenterDelegate = self
    vc?.presentViewController(gc, animated: true, completion: nil)
}



func gameCenterViewControllerDidFinish(gameCenterViewController: GKGameCenterViewController!)
{
    gameCenterViewController.dismissViewControllerAnimated(true, completion: nil)

}






override func prefersStatusBarHidden() -> Bool {
    return true
}


override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}


@IBAction func retryButton(sender: AnyObject) {
    self.dismissViewControllerAnimated(true, completion: nil)
}
}

EDIT Got it working! All I had to do was change

var vc = self.view?.window?.rootViewController

to

var vc = self

score 0 · Answer 1 · answered Feb 25 '15 at 13:42

0

You are probably seeing this warning because you are displaying the Leaderboard before dismissViewControllerAnimated has finished the animation. You should place the showLeader() inside the completion argument of dismissViewControllerAnimated.

answered Feb 25 '15 at 13:42

Aris

1,411
9
14

Hmmm even when I do ` gameCenterViewController.dismissViewControllerAnimated(true, completion: {self.showLeader()})` it still gives me the same error – DanTdd Feb 25 '15 at 13:55
are you dismissing SecondViewController and then trying to present the Leaderboard? – Aris Feb 25 '15 at 15:04
I tried that with the code above unless i did it wrong? – DanTdd Feb 25 '15 at 15:20
You should present the leaderboard from the controller that presented SecondViewController. – Aris Feb 25 '15 at 15:29

score 0 · Answer 2 · answered Nov 10 '15 at 04:54

Here is my Code. Hope it helps! 

if (self.levelGameAttemptCount == 3)
                    {
                        self.canRestart = false

                        let mainStoryboard = UIStoryboard(name: "Main", bundle: nil)
                        let vc = mainStoryboard.instantiateViewControllerWithIdentifier("gameOverControllerID") as! GameOverController
                        self.view!.window!.rootViewController!.dismissViewControllerAnimated(false, completion: nil)
                        UIApplication.sharedApplication().keyWindow!.rootViewController!.presentViewController(vc, animated: true, completion: nil)
                    }
                    else
                    {
                        self.canRestart = true
                    }

Attempt to present GKGameCenterViewController on UIViewController whose view is not in the window hierarchy

2 Answers2