System/Library/PrivateFrameworks/GameCenterUI.framework

GKLeaderboardCollectionViewFlowLayout.h

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1. NSObject
2. >
3. UICollectionViewLayout
4. >
5. UICollectionViewFlowLayout

@interface GKLeaderboardCollectionViewFlowLayout : UICollectionViewFlowLayout

- (BOOL)flipsHorizontallyInOppositeLayoutDirection;

@end