Ios 传入的GameCenter邀请不包含任何玩家

我正在尝试让我的游戏允许1台设备（iPhone）使用GameCenter邀请朋友玩（iPad）。我使用的是标准/默认的媒人界面。iPhone向iPad发送邀请，iPad会发出通知

当我按下此通知时，iPad的“player（GKPlayer，didAccept:GKInvite）”例程确实会被调用

  @objc func player(_ playerMe: GKPlayer, didAccept invite: GKInvite) {
    print("\n\n\t\tplayer \(playerMe.displayName)(\(playerMe.playerID)) did accept INVITE sent by \(invite.sender.displayName)(\(invite.sender.playerID))")
    GKMatchmaker.shared().match(for: invite, completionHandler: {(InvitedMatch, error) in

      print("\t\tplayers.count = \(InvitedMatch!.players.count)")

      if error != nil {
        print("INVITE ERROR: \(error.debugDescription)")
      }

      if InvitedMatch != nil {
        print("\t\tSetting current match. (\(InvitedMatch.debugDescription))")
        self.currentMatch = InvitedMatch
        self.currentMatch?.delegate = self
//        self.prepareMatch()
      }
    })
  }

输出：

        player Me(G:25139341913) did accept INVITE sent by ‎“-----”(G:12453976)
        players.count = 0
        Setting current match. (Optional(<GKMatch 0x282d39970 expected count: 1 seqnum: 0
    G:12453976:unknown
reinvitedPlayers:(
)>))

那么，如何让iPad（邀请的接收者）看到/包含玩家呢？

在player（GKPlayer，invite:GKInvite）方法中，通过

让mmvc=GKMatchmakerViewController（invite:invite！）

然后展示：

viewController.present（mmvc！，动画：true，完成：nil）

  func matchmakerViewController(_ viewController: GKMatchmakerViewController, didFind match: GKMatch) {
    print("\n\n\t\tMATCH FOUND\n\n")
    viewController.dismiss(animated: true, completion: nil)

    GKMatchmaker.shared().stopBrowsingForNearbyPlayers()
    currentMatch = match
    match.delegate = self

    if Globals.gameState?.currentState is StateWaitingForMatch {
      if currentMatch?.expectedPlayerCount == 0 {
        prepareMatch()
      }
    }
  }