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POBizarre GameKit behavior. Anyone else seeing this?
 

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  1. POBizarre GameKit behavior. Anyone else seeing this?
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    <p>I am running Xcode 4.3.3 and am targeting iOS 5.1. I am attempting to include Game Center functionality in a game.</p> <p>When authenticating the GKLocalPlayer the user is presented with the <em>Sign in to Game Center</em> alert view or shown to be logged in. So far this is all fine, but if the user presses the <em>Create New Account</em> button then any open modal views are moved behind the root view controller and the following error is spit from the console:</p> <blockquote> <p>Unbalanced calls to begin/end appearance transitions for &lt;GKModalRootViewController: <em>memory address</em>&gt;.</p> </blockquote> <p>I have tried moving the GKLocalPlayer authentication code between the app delegate and the root view controller. I have also tried implementing the authentication in a new, blank project. I have tried it with and without Storyboards and ARC. In all of these cases the results were the same: modals hidden behind the root view controller and error given.</p> <p>Here is the GKLocalPlayer authentication method I am calling from my app delegate’s <em>application:didFinishLaunchingWithOptions:</em> method:</p> <pre><code>- (void)authenticateLocalPlayer { GKLocalPlayer *localPlayer = [GKLocalPlayer localPlayer]; [localPlayer authenticateWithCompletionHandler:^(NSError *error) { if (localPlayer.isAuthenticated) { // Perform additional tasks for the authenticated player. } else { // Disable Game Center features. } if (error) { // Handle error. } }]; } </code></pre> <p><a href="http://lanausee.com/files/wonkygamekit.png" rel="nofollow noreferrer">Here</a> is a screenshot of it. In this picture the root view controller has a background with a 50% alpha value. The modal has been pushed behind the root view controller by this bug.</p> <p><a href="https://stackoverflow.com/questions/8049118/unbalanced-calls-to-begin-end-appearance-transitions-for-gkmodalrootviewcontrol">This stackoverflow question</a> contains the only reference to this error (regarding GKModalRootViewController) I can find, and it doesn't fit since (a.) I’m not using cocos2d. (b.) It happens whether or not I perform a segue, and I am not touching viewWillAppear: or viewDidAppear:. (c.) No acceptable answer was given.</p> <p><a href="https://stackoverflow.com/questions/11008613/game-center-white-screen-after-create-account">This question</a> and <a href="https://stackoverflow.com/questions/10561309/underlying-view-disappears-during-game-center-authentication">this one</a> seem to involve the same issue (with the view hierarchy being destroyed) but are unanswered and don’t mention the console error message.</p> <p>Does this happen for anyone else? Any ideas on what could be causing this?</p> <p><strong>UPDATE 1:</strong> I went so far as to put the authentication code into an IBAction connected to a button in the modal view so as to avoid any initialization conflicts. It didn't help.</p> <p><strong>UPDATE 2:</strong> I tried moving the authentication code into a GCD background queue. he results were the same.</p> <p><a href="http://lanausee.com/files/gamecenter-test.zip" rel="nofollow noreferrer">Here</a> is the test project (which is GameCenter ready with my app's Bundle ID already entered).</p> <p>To test:</p> <ol> <li>Log out of Game Center on the test device/simulator (if you are logged in).</li> <li>Build and run the app.</li> <li>Press the info button.</li> <li>Press <em>Authenticate</em>.</li> <li>When the Sign in to Game Center alert appears press <em>Create New Account</em>.</li> <li>Press <em>Cancel</em>.</li> <li>Did the “Unbalanced calls...” message appear in the console? Did the modal view (with the Authenticate button) disappear?</li> <li>Press the info button.</li> <li>Did the modal display again?</li> </ol>
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    1. COAre you still experiencing this issue?
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    2. COThe problem persists in iOS 5.1.1, however iOS 6 resolved the issue.
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