How to accept an invitation in Game Center

Question

I\'m trying to implement invitations with Game Center and there\'s one thing that i don\'t understand. Ok, i\'ve sent an invitation from one device to another. Then i have a

Answer 1

I've successfully implemented an online game center match following Ray's tutorials. The answer to you question is: You don't have to send anything to the inviting device. When you call the line:GKMatchmakerViewController *mmvc = [[[GKMatchmakerViewController alloc] initWithMatchRequest:request] autorelease];, the matchMakerVController handles the connection . However, you should write an invitation handler ASAP, preferably in the authentication changed method. See mine:

-(void) authenticationChanged {

if ([GKLocalPlayer localPlayer].isAuthenticated && !userAuthenticated) {
    NSLog(@"Authentication changed: player authenticated.");
    userAuthenticated = TRUE;

    [self sendUnsentScores];

    [GKMatchmaker sharedMatchmaker].inviteHandler = ^(GKInvite *acceptedInvite, NSArray *playersToInvite){

        NSLog(@"Invite");

        if([AppDelegate mainMenuController].presentedViewController!=nil) {
            [[AppDelegate mainMenuController] dismissViewControllerAnimated:NO completion:^{

            }];
        } // if we're not on the main menu, or another game is going on.
          // this would be easier to do if you were using a navigation controller
          // where you'd just push the multiplayer menu etc.


        self.pendingInvite = acceptedInvite;
        self.pendingPlayersToInvite = playersToInvite;

        [[AppDelegate mainMenuController] presentViewController:[AppDelegate mainMenuController].multiGameMenu animated:NO completion:^{ // push the multiplayer menu

            [[AppDelegate mainMenuController].multiGameMenu duel:nil];
        }];

    };

}

and here is the duel method if you're interested. Very messy code but deal with it :)

- (IBAction)duel:(id)sender {
NSLog(@"duel");

if (presentingMenu.multiGameController==nil || presentingMenu.multiGame.gameInProgress==NO) {

    presentingMenu.multiGame=nil;
    presentingMenu.multiGameController=nil;

    MultiViewController *mvc = [[MultiViewController alloc] init]; //create game VC

    presentingMenu.multiGameController = mvc; //presenting menu is just the main menu VC
                                              // it holds this menu, and the game
                                              // objects.
}

if (presentingMenu.multiGame == nil) {

    presentingMenu.multiGame = [[MultiGame alloc] // similarly create the game object

    initWithViewController:presentingMenu.multiGameController];
    //they both have pointers to each other (A loose, bad MVC).                        

    presentingMenu.multiGameController.game = presentingMenu.multiGame;

    [presentingMenu.multiGame startGame];

}

if (presentingMenu.multiGameController.gameState==0) { //new game

    presentingMenu.multiGameController.game = presentingMenu.multiGame;

    [[GCHelper sharedInstance] findMatchWithMinPlayers:2 maxPlayers:2 viewController:self delegate:presentingMenu.multiGame]; // the GC magic happens here - it know about the invite.

} else {

    [self presentViewController:presentingMenu.multiGameController animated:YES completion:^{

    }];

}

}