ios - 初始化GKMatchMakerViewController时出错

我正在尝试制作一个使用实时比赛的简单在线多人游戏。但是，当我尝试启动GKMatchmakerViewController时会抛出错误，这是我正在运行的当前代码:

func openMatchmaker() {
    var gcViewController: GKMatchmakerViewController = GKMatchmakerViewController(rootViewController: self)

    gcViewController.matchmakerDelegate = self

    gcViewController.hosted = false
    gcViewController.matchRequest.minPlayers = 2
    gcViewController.matchRequest.maxPlayers = 2
    gcViewController.matchRequest.defaultNumberOfPlayers = 2

    self.showViewController(gcViewController, sender: self)
    self.navigationController?.pushViewController(gcViewController, animated: true)
}

但是，运行时会引发此错误:

Terminating app due to uncaught exception 'UIViewControllerHierarchyInconsistency', reason: 'adding a root view controller <GameName.GameViewController: 0x12e61a930> as a child of view controller:<GKMatchmakerViewController: 0x12e92b800>'

现在，我以前在尝试使用GameCenter排行榜时遇到此错误。我通过不使用rootViewController参数启动排行榜视图控制器来修复它。但是，这不是GKMatchmakerViewController的选项，它只会引发另一个错误。任何帮助，万分感谢!

编辑:我知道你们中的很多人都集中在介绍视图控制器的那一行，但是我认为错误在于我第一次初始化视图控制器时:var gcViewController: GKMatchmakerViewController = GKMatchmakerViewController(rootViewController: self)，可能与将rootViewController设置为self有关。不过，这只是一个想法。再次感谢!

最佳答案

好的，我回过头来重新编写了如下代码:

func displayGameMaker(){
    if (GKLocalPlayer.localPlayer().authenticated){
        var request = GKMatchRequest()
        request.minPlayers = 2
        request.maxPlayers = 2
        request.inviteMessage = "You have been invited to a game!"
        var vc = GKMatchmakerViewController(matchRequest: request)
        vc.matchmakerDelegate = self
        self.showViewController(vc, sender: self)
    }
}

因此，如果将来有任何人在制作GKMatchmakerViewController时遇到问题，这就是方法。我只需要使用matchRequest而不是使用rootViewController。