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    <p>I'm from BivisSoft. We've developed Bubblin.</p> <p>We have a Singleton that controls GameCenter.</p> <p>Here is our code... It's based on tutorial by Jacob Gundersen - <a href="http://www.raywenderlich.com/5480/beginning-turn-based-gaming-with-ios-5-part-1" rel="nofollow">http://www.raywenderlich.com/5480/beginning-turn-based-gaming-with-ios-5-part-1</a>.</p> <p>You can try it!</p> <pre><code> #pragma mark Singleton static BSGameCenterManager *sharedHelper = nil; + (BSGameCenterManager *) sharedInstance { if (!sharedHelper) { sharedHelper = [[BSGameCenterManager alloc] init]; } return sharedHelper; } #pragma mark Initializers - (id)init { if ((self = [super init])) { gameCenterAvailable = [self isGameCenterAvailable]; if (gameCenterAvailable) { self.localPlayerId = @""; NSNotificationCenter *nc = [NSNotificationCenter defaultCenter]; [nc addObserver:self selector:@selector(authenticationChanged) name:GKPlayerAuthenticationDidChangeNotificationName object:nil]; } } return self; } // Check if GameCenter is Avaiable - (BOOL)isGameCenterAvailable { // check for presence of GKLocalPlayer API Class gcClass = (NSClassFromString(@"GKLocalPlayer")); // check if the device is running iOS 4.1 or later NSString *reqSysVer = @"4.1"; NSString *currSysVer = [[UIDevice currentDevice] systemVersion]; BOOL osVersionSupported = ([currSysVer compare:reqSysVer options:NSNumericSearch] != NSOrderedAscending); return (gcClass &amp;&amp; osVersionSupported); } #pragma mark Authentication - (void)authenticationChanged { if ([GKLocalPlayer localPlayer].isAuthenticated &amp;&amp; !self.userAuthenticated) { NSLog(@"GameCenter authentication changed: player authenticated."); self.userAuthenticated = TRUE; self.localPlayerId = [[GKLocalPlayer localPlayer] playerID]; [[NSNotificationCenter defaultCenter] postNotificationName: @"gameCenterPlayerAuthenticated" object: nil userInfo: nil]; [self checkNotSentScores]; } else if (![GKLocalPlayer localPlayer].isAuthenticated &amp;&amp; self.userAuthenticated) { NSLog(@"GameCenter authentication changed: player not authenticated"); self.userAuthenticated = FALSE; self.localPlayerId = @""; } } - (void)authenticateLocalUser { if (!gameCenterAvailable) return; NSLog(@"GameCenter authenticating local user..."); if ([GKLocalPlayer localPlayer].authenticated == NO) { [[GKLocalPlayer localPlayer] authenticateWithCompletionHandler:nil]; } else { NSLog(@"GameCenter already authenticated!"); } } </code></pre>
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    1. COThanks! The only thing different I see offhand is the singleton part, but I'll definitely give it a try.
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