System/Library/PrivateFrameworks/GameCenterFoundation.framework
GKUnknownPlayerInternal.h
Download GKUnknownPlayerInternal.h
@interface GKUnknownPlayerInternal : GKSpecialPlayerInternal
+ (BOOL)supportsSecureCoding;
- (id)playerID;
- (BOOL)isUnknownPlayer;
- (id)gamePlayerID;
- (id)teamPlayerID;
@end