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    <p>Jamie West correctly noted that the problem was the changeover to authenticateHandler in iOS6, which seems to have left authenticateWithCompletionHandler: broken. Since it's been deprecated, Apple is unlikely to fix their bug.</p> <p>Here's everything that I needed. Note both the conditional to check iOS5 version (to support both 5 and 6) and the need to call up a view controller if it's sent (e.g., authenticateHandler: isn't a direct replacement to authenticateWithCompletionHandler: — you have to do some extra work).</p> <pre><code>-(void)authenticateLocalUser { if (!self.checkingLocalPlayer) { self.checkingLocalPlayer = YES; GKLocalPlayer *thisPlayer = [GKLocalPlayer localPlayer]; if (!thisPlayer.authenticated) { #define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending) if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"6.0")) { [thisPlayer setAuthenticateHandler:(^(UIViewController* viewcontroller, NSError *error) { if (viewcontroller) { [self.delegate presentViewController:viewcontroller]; } else { [self finishGameCenterAuthWithError:error]; } })]; } else { [[GKLocalPlayer localPlayer] authenticateWithCompletionHandler:^(NSError *error) { [self finishGameCenterAuthWithError:error]; } ]; } } } } </code></pre> <p>The presentViewController: function simply calls up the new view controller from my top view controller (which I had to figure out by hand in my program to make all this work):</p> <pre><code>-(void)presentViewController:(UIViewController *)thisVC { [myTopVC presentModalViewController:thisVC animated:YES]; } </code></pre> <p>Unfortunately, as of iOS6, it looks like GameCenter won't try to reauth a user if that's already been canceled in the current session, so at least some of my point of reauthing when appropriate is gone. But, it's still there for iOS5 (and maybe other situations than canceling?). </p> <p>It <em>will</em> try to reauth when the app is called back up from sleep if a user has gone and done something else.</p>
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    1. POGKLocalPlayer Auth Crash on iOS6 with Modal Transition Error
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    1. COAny reason that you're checking the iOS version instead of just checking whether the `setAuthenticateHandler:` method is available? I'm wondering if this might just be undocumented in iOS < 6...
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    2. COJust seemed clearer to me.
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    3. COWell, unless absolutely necessary, Apple strongly recommends checking for the availability of selectors and classes rather than checking for specific iOS versions. You can always add a comment in your code if you want to be reminded of the reason...
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