GKGameCenterViewControllerState.default The view controller should present the default screen. Declarationcase `default` See AlsoStatesGKGameCenterViewControllerState.leaderboardsGKGameCenterViewControllerState.achievementsGKGameCenterViewControllerState.challengesGKGameCenterViewControllerState.localPlayerProfileGKGameCenterViewControllerState.dashboardGKGameCenterViewControllerState.localPlayerFriendsList