class GKAchievement : NSObject, NSCoding, NSSecureCoding {
    class func loadAchievementsWithCompletionHandler(_ completionHandler: (([GKAchievement]?, NSError?) -> Void)?)
    class func resetAchievementsWithCompletionHandler(_ completionHandler: ((NSError?) -> Void)?)
    init(identifier identifier: String?)
    init(identifier identifier: String?, player player: GKPlayer)
    class func reportAchievements(_ achievements: [GKAchievement], withCompletionHandler completionHandler: ((NSError?) -> Void)?)
    var identifier: String?
    var percentComplete: Double
    var completed: Bool { get }
    @NSCopying var lastReportedDate: NSDate { get }
    var showsCompletionBanner: Bool
    var player: GKPlayer { get }
}
extension GKAchievement {
    func reportAchievementWithCompletionHandler(_ completionHandler: ((NSError?) -> Void)?)
    init(identifier identifier: String?, forPlayer playerID: String)
    var hidden: Bool { get }
    var playerID: String { get }
}
extension GKAchievement {
    func challengeComposeControllerWithMessage(_ message: String?, players players: [GKPlayer], completionHandler completionHandler: GKChallengeComposeCompletionBlock?) -> UIViewController
    func selectChallengeablePlayers(_ players: [GKPlayer], withCompletionHandler completionHandler: (([GKPlayer]?, NSError?) -> Void)?)
    class func reportAchievements(_ achievements: [GKAchievement], withEligibleChallenges challenges: [GKChallenge], withCompletionHandler completionHandler: ((NSError?) -> Void)?)
}
extension GKAchievement {
    func selectChallengeablePlayerIDs(_ playerIDs: [String]?, withCompletionHandler completionHandler: (([String]?, NSError?) -> Void)?)
    func issueChallengeToPlayers(_ playerIDs: [String]?, message message: String?)
    func challengeComposeControllerWithPlayers(_ playerIDs: [String]?, message message: String?, completionHandler completionHandler: GKChallengeComposeCompletionBlock?) -> UIViewController?
}

class GKAchievement : NSObject, NSCoding, NSSecureCoding {
    class func loadAchievementsWithCompletionHandler(_ completionHandler: (([GKAchievement]?, NSError?) -> Void)?)
    class func resetAchievementsWithCompletionHandler(_ completionHandler: ((NSError?) -> Void)?)
    init(identifier identifier: String?)
    init(identifier identifier: String?, player player: GKPlayer)
    class func reportAchievements(_ achievements: [GKAchievement], withCompletionHandler completionHandler: ((NSError?) -> Void)?)
    var identifier: String?
    var percentComplete: Double
    var completed: Bool { get }
    @NSCopying var lastReportedDate: NSDate { get }
    var showsCompletionBanner: Bool
    var player: GKPlayer { get }
}
extension GKAchievement {
    func reportAchievementWithCompletionHandler(_ completionHandler: ((NSError?) -> Void)?)
    init(identifier identifier: String?, forPlayer playerID: String)
    var hidden: Bool { get }
    var playerID: String { get }
}
extension GKAchievement {
    func challengeComposeControllerWithMessage(_ message: String?, players players: [GKPlayer], completionHandler completionHandler: GKChallengeComposeCompletionBlock?) -> UIViewController
    func issueChallengeToPlayers(_ playerIDs: [String]?, message message: String?)
    func selectChallengeablePlayers(_ players: [GKPlayer], withCompletionHandler completionHandler: (([GKPlayer]?, NSError?) -> Void)?)
    class func reportAchievements(_ achievements: [GKAchievement], withEligibleChallenges challenges: [GKChallenge], withCompletionHandler completionHandler: ((NSError?) -> Void)?)
}
extension GKAchievement {
    func selectChallengeablePlayerIDs(_ playerIDs: [String]?, withCompletionHandler completionHandler: (([String]?, NSError?) -> Void)?)
    func challengeComposeControllerWithPlayers(_ playerIDs: [String]?, message message: String?, completionHandler completionHandler: GKChallengeComposeCompletionBlock?) -> UIViewController?
}

class GKGameCenterViewController : UINavigationController {
    unowned(unsafe) var gameCenterDelegate: GKGameCenterControllerDelegate?
    var viewState: GKGameCenterViewControllerState
}
extension GKGameCenterViewController {
    var leaderboardTimeScope: GKLeaderboardTimeScope
    var leaderboardIdentifier: String?
    var leaderboardCategory: String?
}

class GKGameCenterViewController : UINavigationController {
}
extension GKGameCenterViewController {
    unowned(unsafe) var gameCenterDelegate: GKGameCenterControllerDelegate?
    var viewState: GKGameCenterViewControllerState
}
extension GKGameCenterViewController {
    var leaderboardTimeScope: GKLeaderboardTimeScope
    var leaderboardIdentifier: String?
    var leaderboardCategory: String?
}