Iphone 当GKMatchmakerViewController打开时，您如何接收游戏中心邀请？

我正在开发一个游戏中心多人应用程序，我发现了一些让我抓狂的东西。只要两台设备都没有GKMatchmakerViewController启动并运行，我就可以收到游戏邀请。但是，当两台设备都打开并发出邀请时，用户在警报横幅上选择“接受”后不会发生任何事情。有没有什么好的例子可以说明如何做到这一点？我正在与Ray Wenderlich的GCHelper合作，已经有好几个星期没有在这个问题上取得任何进展

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

        NSLog(@"Received invite!!!");
        self.pendingInvite = acceptedInvite;
        self.pendingPlayersToInvite = playersToInvite;

        Class gcClass = (NSClassFromString(@"GKLocalPlayer"));
        NSString *reqSysVer = @"5.0";
        NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
        BOOL osVersionSupported = ([currSysVer compare:reqSysVer
                                               options:NSNumericSearch] != NSOrderedAscending);

        gameCenterAvailable=gcClass && osVersionSupported;
        if (!gameCenterAvailable) return;

        matchStarted = NO;
        self.match = nil;

        if (acceptedInvite) {
            NSLog(@"pendingInvite != nil");

             AppDelegate *gcdelegate = (AppDelegate *) [UIApplication sharedApplication].delegate;

            [gcdelegate.viewController  dismissModalViewControllerAnimated:YES];
            GKMatchmakerViewController *mmvc = [[GKMatchmakerViewController alloc] initWithInvite:pendingInvite];
            mmvc.matchmakerDelegate = self;
            [gcdelegate.viewController  presentModalViewController:mmvc animated:YES];

            self.pendingInvite = nil;
            self.pendingPlayersToInvite = nil;

            boo_invite=true;


        }
        else {
            NSLog(@"pendingInvite == nil");

            AppDelegate *gcdelegate = (AppDelegate *) [UIApplication sharedApplication].delegate;
            [gcdelegate.viewController dismissModalViewControllerAnimated:NO];

            request = [[GKMatchRequest alloc] init];
            request.minPlayers = 2;
            request.maxPlayers = 4;
            request.playersToInvite = pendingPlayersToInvite;

            GKMatchmakerViewController *mmvc = [[GKMatchmakerViewController alloc] initWithMatchRequest:request];
            mmvc.matchmakerDelegate = self;

            [gcdelegate.viewController dismissModalViewControllerAnimated:YES];

            self.pendingInvite = nil;
            self.pendingPlayersToInvite = nil;

        }


    };

我认为这个问题与""

警告：试图显示 在演示文稿进行时打开 进步

---

我需要做些什么来修复此问题？

看起来问题在于没有等待足够长的时间来解除控制器

        [gcdelegate.viewController  dismissViewControllerAnimated:YES
                                 completion:^{
                                     GKMatchmakerViewController *mmvc = [[GKMatchmakerViewController alloc] initWithInvite:pendingInvite];
                                     mmvc.matchmakerDelegate = self;
                                     [gcdelegate.viewController presentModalViewController:mmvc animated:YES];
                                     self.pendingInvite = nil;
                                     self.pendingPlayersToInvite = nil;
                                     boo_invite=true;
                                 }];

处理好了