没有找到游戏中心的玩家 . 我测试我的游戏错了吗？

我让游戏在Xcode模拟器和我的iPhone上运行 . 当我点击搜索时，它们都被放入单独的游戏中，而不是一个玩家加入现有游戏 . 这是一个回合制游戏，玩家可以在游戏中心自动匹配时进行第一次转弯 . 我正在使用两个单独的Game Center帐户和Sandbox设置 . 知道我可能做错了吗？对于那些开发了游戏中心支持的游戏的人来说，你是如何测试它的？谢谢您的帮助！

一些代码：

- (void)findMatchWithMinPlayers:(int)minPlayers maxPlayers:(int)maxPlayers // view controller calls to find match - nothing if GC unavaiable
             viewController:(UIViewController *)viewController {


if (!_enableGameCenter) return;


_matchStarted = NO; // Match not started yet
self.currentMatch = nil;
[viewController dismissViewControllerAnimated:NO completion:nil];

GKMatchRequest *request = [[GKMatchRequest alloc] init]; // Set number of players
request.minPlayers = minPlayers;
request.maxPlayers = maxPlayers;

GKTurnBasedMatchmakerViewController *mmvc = // new instance of the GKMatchmakerViewController with the given request, sets its delegate to the GameKitHelper object, and uses the passed-in view controller to show it on the screen. Shows the user to search for a random player and start a game.
[[GKTurnBasedMatchmakerViewController alloc] initWithMatchRequest:request];
mmvc.turnBasedMatchmakerDelegate = self;

[viewController presentViewController:mmvc animated:YES completion:nil];
}

#pragma mark GKTurnBasedMatchmakerViewControllerDelegate

// A peer-to-peer match has been found, the game should start
- (void)turnBasedMatchmakerViewController:(GKTurnBasedMatchmakerViewController *)viewController didFindMatch:(GKTurnBasedMatch *)match {
[viewController dismissViewControllerAnimated:YES completion:nil];
self.currentMatch = match;
GKTurnBasedParticipant *firstParticipant = [match.participants objectAtIndex:0];
if (firstParticipant.lastTurnDate == NULL) {
    // It's a new game!
    [delegate enterNewGame:match];
} else {
    if ([match.currentParticipant.player isEqual:[GKLocalPlayer localPlayer].playerID]) {
        // It's your turn!
        [delegate takeTurn:match];
    } else {
        // It's not your turn, just display the game state.
        [delegate layoutMatch:match];
    }
    }
}