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

Adding a Player to a Match

There might be occasions in which you will want to add a new player to a match after it has already been created. For example, maybe you have a player drop from a game and want to replace him without starting the game over, or a player fails to connect after a game starts and you want to substitute in a replacement. The following method will automatically add a new player to the match using the auto-matching behavior.

- (void)addPlayerToMatch:(GKMatch *)match withRequest:(GKMatchRequest *)request {         [[GKMatchmaker sharedMatchmaker] addPlayersToMatch:match matchRequest:request  completionHandler:^(NSError *error) ...