Beginning iOS Game Center and Game Kit: For iPhone, iPad, and iPod touch

Quitting and Forfeiting

A player can quit a match at any time by swiping across it from the matchmaker view controller. However, you might want to add a path for your users to forfeit or quit a match from inside of your game itself. To allow a player to forfeit a match, use the following code snippet.

- (IBAction)forfeit:(id)sender {     [self.match participantQuitOutOfTurnWithOutcome:GKTurnBasedMatchOutcomeQuit withCompletionHandler:^(NSError *error) {         if (error) {             NSLog(@"An error occurred ending match: %@", [error localizedDescription]);         }     }]; }