Terminating app due to uncaught exception NSInvalidArgumentException

Question

I have an app which has Game Center Leaderboards, and an Admob banner included. The ads are live and when I run the app on an actual device through Xcode 8 it run fine. But when I launch an emulator from Xcode 8 the app loads but after a few seconds I have the error:

    *** Terminating app due to uncaught exception 'NSInvalidArgumentException', 
        reason: 'Application tried to present modal view controller on itself. Presenting controller is <GKHostedAuthenticateViewController: 0x7f818d749310>.'

I am currently setting up my banner ad in my view controller like so:

    mybanner.adUnitID = "XXX";
    super.viewDidLoad();

    mybanner.rootViewController = self;
    mybanner.delegate = self;
    let request = GADRequest();
    mybanner.load(request);

    //view.addConstraint(NSLayoutConstraint(item: mybanner, attribute: .bottom, relatedBy: .equal, toItem: view, attribute: .bottom, multiplier: 1, constant: 0));
    //view.addConstraint(NSLayoutConstraint(item: mybanner, attribute: .centerX, relatedBy: .equal, toItem: view, attribute: .centerX, multiplier: 1, constant: 0));

    NotificationCenter.default.addObserver(self, selector: #selector(self.showBannerAd), name: NSNotification.Name(rawValue: "showbannerad"), object: nil);
    NotificationCenter.default.addObserver(self, selector: #selector(self.hideBannerAd), name: NSNotification.Name(rawValue: "hidebannerad"), object: nil);

And calling the notifications to show/hide the banner from the scene classes as follows:

  NotificationCenter.default.post(name: NSNotification.Name(rawValue: "showbannerad"), object: nil);

I am initializing my Game Center object in its own class and calling its init method from the start screen the init for the Game Center Controller is as follows:

func authPlayer(scene: SKScene) {
    let localPlayer = GKLocalPlayer.localPlayer();

    localPlayer.authenticateHandler = {
        (view, error) in
        if view != nil {
            view!.present(view!, animated: true, completion: nil);
        }else {
            print(GKLocalPlayer.localPlayer().isAuthenticated);
        }
    }
}

  /// In the GamvViewController
  func showBannerAd() {
    if mybanner.isHidden == true {
        mybanner.isHidden = false;
    }
}

Its strange that it works on an actual device but not in an emulator. If you would like more details let me know. Thanks.

what is mybanner? why you set it's rootViewController to itself?? it seems to be the problem here. — Codus
Show the funcs that you're calling with your notifications. — Daniel Storm
My banner is an Admob banner. And its in the GameViewController class. — Keith Drake Waggoner

zacks zacks · Accepted Answer · 2017-07-16T14:49:34

In the localPlayer.authenticateHandler,there is a view,what is the class?Is it GKHostedAuthenticateViewController?.If it is,that is the problem. The error message is clear,some ViewController call the present it self.

Terminating app due to uncaught exception NSInvalidArgumentException

1 Answers