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我使用本教程访问 GameCenter。 http://www.raywenderlich.com/3276/how-to-make-a-simple-multiplayer-game-with-game-center-tutorial-part-12 我可以进入游戏中心，但是如果我想使用此代码：

 SFAppDelegate * delegate = (SFAppDelegate *) [UIApplication sharedApplication].delegate;                
    [[GCHelper sharedInstance] findMatchWithMinPlayers:2 maxPlayers:2 viewController:self delegate:self];

这段代码应该可以工作，但如果我打电话给我，它只会在上面显示带有蓝色工具栏的黑屏。这里的“self”是 UIViewController，这个控制器实现了 GCHelper 委托方法。

方法 find ... 看起来像这样：

- (void)findMatchWithMinPlayers:(int)minPlayers maxPlayers:(int)maxPlayers viewController:(UIViewController *)viewController delegate:(id<GCHelperDelegate>)theDelegate {

    if (!gameCenterAvailable) return;

    matchStarted = NO;
    self.match = nil;
    self.presentingViewController = viewController; // ?
    delegate = theDelegate;               
    [presentingViewController dismissModalViewControllerAnimated:NO];


    if (pendingInvite != nil) 
    {   
        [presentingViewController dismissModalViewControllerAnimated:NO];
        GKMatchmakerViewController *mmvc = [[[GKMatchmakerViewController alloc] initWithInvite:pendingInvite] autorelease];
        mmvc.matchmakerDelegate = self;
        [presentingViewController presentModalViewController:mmvc animated:YES];

        self.pendingInvite = nil;
        self.pendingPlayersToInvite = nil;
    }
    else 
    {   
        [presentingViewController dismissModalViewControllerAnimated:NO];
        GKMatchRequest *request = [[[GKMatchRequest alloc] init] autorelease]; 
        request.minPlayers = minPlayers;     
        request.maxPlayers = maxPlayers;
        request.playersToInvite = pendingPlayersToInvite;

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

        [presentingViewController presentModalViewController:mmvc animated:YES];

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

我不知道我做错了什么......感谢任何更正的建议。:)

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