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Editorial Team
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Asked: 2026-06-11T22:56:46+00:00

My app keeps a record of whether it’s successfully authenticated with Game Center. When

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My app keeps a record of whether it’s successfully authenticated with Game Center. When it starts a new game or when the user looks at the score list, if a local player hasn’t been successfully authenticated, and if the app isn’t in the middle of trying to authenticate a user at the time, it tries again.

(Why? In case you’ve moved from a no-network zone to a network zone.)

Unfortunately, under iOS6/XCode 4.5, it’s started crashing. Or at least it seems to in certain limited circumstances: when a user fails to log in with a bad password and/or an account that doesn’t exist. On a successful login, all is well.

After that unsuccessful login, when I go and do something that causes a reauth check to occur I get this:

2012-09-25 15:54:47.829 APP NAME [1493:907] *
Assertion failure in -[UIWindowController
transition:fromViewController:toViewController:target:didEndSelector:],
/SourceCache/UIKit/UIKit-2372/UIWindowController.m:211

Then this actually crashes:

2012-09-25 15:55:25.569 APP NAME [1493:907] *
Terminating app due to uncaught exception
‘NSInternalInconsistencyException’, reason: ‘Attempting to begin a
modal transition from <GKModalRootViewController: 0x1cd8b2a0> to
<GKHostedAuthenticateViewController: 0x1e31a350> while a transition is
already in progress. Wait for viewDidAppear/viewDidDisappear to know
the current transition has completed’
* First throw call stack: (0x394932a3 0x31db297f 0x3949315d 0x383fd2af 0x3640377b 0x36402fcf 0x394969c4 0x393edfeb 0x36521733
0x32a83d2d 0x3264b11f 0x3264a4b7 0x3264f1bd 0x39466f3b 0x393d9ebd
0x393d9d49 0x353132eb 0x3636b301 0x7e863 0x7e808) libc++abi.dylib:
terminate called throwing an exception

This is the troublesome code:

-(void)authenticateLocalUser {

    if (!self.checkingLocalPlayer) {
        self.checkingLocalPlayer = YES;
        GKLocalPlayer *thisPlayer = [GKLocalPlayer localPlayer];

        if (!thisPlayer.authenticated) {

            [[GKLocalPlayer localPlayer]
             authenticateWithCompletionHandler:^(NSError *error)
             {
                 [self finishGameCenterAuthWithError:error];
             }
             ];
        }
    }
}

Any idea what I’m doing wrong here?

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1 Answer

  1. Editorial Team

    Ggrrrhhh same issue, think I found it…ios6 have deprecated authenticateWithCompletionHandler see link, the propose you use AuthenticateHandler.

    http://developer.apple.com/library/IOS/#documentation/GameKit/Reference/GKLocalPlayer_Ref/Reference/Reference.html#//apple_ref/occ/instp/GKLocalPlayer/authenticateHandler

    This appears to work…

    GKLocalPlayer *localPlayer = [GKLocalPlayer localPlayer];
[localPlayer setAuthenticateHandler:(^(UIViewController* viewcontroller, NSError *error) {

//[localPlayer authenticateWithCompletionHandler:^(NSError *error) { OLD CODE!
    if (localPlayer.isAuthenticated)
    {
        //do some stuff
    }
    else {

        UIAlertView *alertView = [[UIAlertView alloc]
                                  initWithTitle:@"NOT AUTHORISED"
                                  message:@"YOUR'RE NOT LOGGED INTO GC."
                                  delegate:self
                                  cancelButtonTitle:@"OK"
                                  otherButtonTitles:nil];
        [alertView show];

    }
})];
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