How to detect Game Center support?

Question

In Apples documentation for Game Center it says to use this code to detect if Game Center is available:

+ (BOOL) isGameCenterAvailable {
  Class gcClass = (NSClassFromString(@"GKLocalPlayer"));

  NSString *reqSysVer = @"4.1";
  NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
  BOOL osVersionSupported = ([currSysVer compare:reqSysVer options:NSNumericSearch] != NSOrderedAscending);

  return (gcClass && osVersionSupported);
}

But it returns YES on my iPhone 3G which doesn't have Game Center. Anyone out there who has solved this?

Answer 1

The answer is that you can't. Apple wants us to attempt to login to see if Game Center is there. Odd, but that's how it is.

Answer 2

Actually, you can check if your application can open one of the gamecenter: URL schemes.

BOOL canOpenGC = [[UIApplication sharedApplication] canOpenURL:[NSURL urlWithString:@"gamecenter:/me/account]];

See this StackOverflow answer on the matter

Answer 3

I have not tried this, but try getting the local player singleton:

if (![gcClass localPlayer]) {
    // then you havnt got game center support
}