System/Library/PrivateFrameworks/GameCenterUI.framework

GameCenterUI.ChallengePlayersActionImplementation.h

Download GameCenterUI.ChallengePlayersActionImplementation.h

1. _TtCs12_SwiftObject

@interface GameCenterUI.ChallengePlayersActionImplementation : _TtCs12_SwiftObject {
    void /* unknown type, empty encoding */ viewController;
}

@end