如何在 Game Center 中接受邀请

我正在尝试通过游戏中心实施邀请，但有一点我不明白。好的，我已从一台设备向另一台设备发送了邀请。然后我在接收器上有一个 UIAlertView 询问我是否愿意接受或拒绝邀请。当我接受它时，它的处理方式如下：

[GKMatchmaker sharedMatchmaker].inviteHandler = ^(GKInvite *acceptedInvite, NSArray *playersToInvite) 
                 {
                     // Insert application-specific code here to clean up any games in progress.
                     if (acceptedInvite)
                     {
                         GKMatchmakerViewController *mmvc = [[[GKMatchmakerViewController alloc] initWithInvite:acceptedInvite] autorelease];
                         mmvc.matchmakerDelegate = self;
                         [presentingViewController presentModalViewController:mmvc animated:YES];
                     }
                     else if (playersToInvite)
                     {
                         GKMatchRequest *request = [[[GKMatchRequest alloc] init] autorelease];
                         request.minPlayers = 2;
                         request.maxPlayers = 4;
                         request.playersToInvite = playersToInvite;

                         GKMatchmakerViewController *mmvc = [[[GKMatchmakerViewController alloc] initWithMatchRequest:request] autorelease];
                         mmvc.matchmakerDelegate = self;
                         [presentingViewController presentModalViewController:mmvc animated:YES];

                     }
                 };

嗯，那太好了，但是接下来呢？发送者设备显然正在等待某种标准类型的响应，因为它还显示一条警报，告诉我如果我点击“立即播放”，则有一些邀请尚未答复。

那么我该如何接受邀请呢？我应该发回什么样的数据（以及如何）？我在接收方到底应该做什么？游戏应该在点击“接受”后立即开始，还是应该先关闭 AlertView，然后点击“立即玩”？

Ray Wenderlich 的教程说我应该选择第二种方式，但是当解除警报并点击“立即播放”时，事实证明发送者设备仍在等待响应并且不知道我已经接受了邀请。如果我此时点击“立即播放”，那么正如我上面所说，它会显示一条警报，表明应用程序正在等待响应。因此，如果您曾经这样做过，请解释一下我应该做什么。谢谢！

1. 游戏加载后我就注册邀请并致电 收到邀请时委托
2. 因此inviteReceived会调用匹配器来取消比赛 中心控制器并创建匹配
3. 最后，当找到匹配项时，该方法 connectionStatusChanged 负责呈现游戏的所有状态 观点、球员和其他东西

这是代码：

我在游戏加载后立即注册邀请，并在收到邀请后致电委托人：

- (void)registerInvites {
    [GKMatchmaker sharedMatchmaker].inviteHandler = ^(GKInvite *acceptedInvite, NSArray *playersToInvite) {
        self.pendingInvite = acceptedInvite;
        self.pendingPlayersToInvite = playersToInvite;
        [delegate inviteReceived];
    };
}

因此，inviteReceived 会调用匹配器来关闭游戏中心控制器并创建匹配：

- (void)inviteReceived {
    [[GCMultiplayerHelper sharedInstance] findMatchWithMinPlayers:2 maxPlayers:2 viewController:(UIViewController*)[self.superview nextResponder] delegate:self];
}


- (void)findMatchWithMinPlayers:(int)minPlayers maxPlayers:(int)maxPlayers viewController:(UIViewController *)viewController delegate:(id<GCMultiplayerHelperDelegate>)theDelegate {
    if (!gameCenterAvailable) return;

    matchStarted = NO;
    self.match = nil;
    self.presentingViewController = viewController;
    delegate = theDelegate;

    [presentingViewController dismissModalViewControllerAnimated:YES];
    GKMatchmakerViewController *mmvc;

    if (pendingInvite != nil) {

        mmvc = [[[GKMatchmakerViewController alloc] initWithInvite:pendingInvite] autorelease];

    } else {

        GKMatchRequest *request = [[[GKMatchRequest alloc] init] autorelease]; 
        request.minPlayers = minPlayers;     
        request.maxPlayers = maxPlayers;
        request.playersToInvite = pendingPlayersToInvite;

        mmvc = [[[GKMatchmakerViewController alloc] initWithMatchRequest:request] autorelease];    

    }

    mmvc.matchmakerDelegate = self;
    [presentingViewController presentModalViewController:mmvc animated:YES];

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

最后，当找到匹配时，connectionStatusChanged 方法负责显示所有游戏视图、玩家并开始匹配：

- (void)matchmakerViewController:(GKMatchmakerViewController *)viewController didFindMatch:(GKMatch *)theMatch
{
    self.match = theMatch;
    match.delegate = self;
    if (!matchStarted && match.expectedPlayerCount == 0) {
        NSLog(@"Ready to start match! - didFindMatch");
        [presentingViewController dismissModalViewControllerAnimated:YES];

        [self.delegate connectionStatusChanged:CONNECTIONSUCCESS];
    }
}