According to the Apple docs we should do something like this to handle GC authentication:
- (void) authenticateLocalUser { GKLocalPlayer *localPlayer = [GKLo
The Game Center DELEGATE method: 'gameCenterViewControllerDidFinish' is called automatically when the Game Center viewController is 'Done'. (This is a compulsory method for the delegate.)
You can put whatever you need for your app, in this method.