GameCenter login alert

Question

In a game I am developing using GameCenter, I want to handle the following scenario:

1. the user starts up the game. He is shown the system alert that prompts him to

Answer 1

I couldn't find a good answer for this either, so I decided to just replicate the message once the I start getting the cancel error. This is still in development but it basically changes the button callback to display the error alert rather than display the leader-board.

Just a note, not sure if this will be approved or not since I am replicating an Apple error message.

-(void) gcLogin: (id) sender {
    [[GKLocalPlayer localPlayer] authenticateWithCompletionHandler:^(NSError *error) {
        if(error) {
            if([[error domain] isEqualToString:GKErrorDomain] && [error code] == GKErrorCancelled) {
                [ResourceManager showAlertWithTitle:@"GameCenter Disabled" message:@"Sign in with Game Center application to enable"];
                mGameCenterCancelled = YES;
            }
            NSLog(@"%@", [error description]);
        } else { 
            [self updateMenu];
            mGameCenterCancelled = NO;
        }
    }];
}