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@interface GameCenterUI.GKExpandedGroupViewController : GameCenterUI.GKExpandedGroupBaseViewController <UICollectionViewDelegateFlowLayout, UICollectionViewDataSource> {
    void /* unknown type, empty encoding */ cornerRadius;
    void /* unknown type, empty encoding */ pickerPlayerCellReuseIdentifier;
    void /* unknown type, empty encoding */ pickerPlayerCellReuseIdentifierAX;
    void /* unknown type, empty encoding */ dataSourceIdentifier;
    void /* unknown type, empty encoding */ playerSelectionProxy;
    void /* unknown type, empty encoding */ multiplayerPickerDataSource;
    void /* unknown type, empty encoding */ selectedPlayerCount;
    void /* unknown type, empty encoding */ maxPlayerCount;
    void /* unknown type, empty encoding */ players;
}

@property (nonatomic, weak) void /* unknown type, empty encoding */ doneButton;
@property (nonatomic, weak) void /* unknown type, empty encoding */ collectionView;
@property (nonatomic, weak) void /* unknown type, empty encoding */ contentViewWidthConstraint;
@property (nonatomic, weak) void /* unknown type, empty encoding */ visualEffectView;
@property (nonatomic, weak) void /* unknown type, empty encoding */ container;
@property (nonatomic, weak) void /* unknown type, empty encoding */ titleLabel;
@property (nonatomic, weak) void /* unknown type, empty encoding */ collectionViewHeightConstraint;
@property (nonatomic, weak) void /* unknown type, empty encoding */ delegate;

- (struct CGSize { double x0; double x1; })collectionView:(id)a0 layout:(id)a1 sizeForItemAtIndexPath:(id)a2;
- (void)viewWillAppear:(BOOL)a0;
- (void)traitCollectionDidChange:(id)a0;
- (void)viewDidLayoutSubviews;
- (void)viewDidLoad;
- (id)initWithNibName:(id)a0 bundle:(id)a1;
- (void)viewWillDisappear:(BOOL)a0;
- (void).cxx_destruct;
- (BOOL)collectionView:(id)a0 shouldSelectItemAtIndexPath:(id)a1;
- (long long)collectionView:(id)a0 numberOfItemsInSection:(long long)a1;
- (id)collectionView:(id)a0 cellForItemAtIndexPath:(id)a1;
- (id)initWithCoder:(id)a0;
- (BOOL)collectionView:(id)a0 shouldDeselectItemAtIndexPath:(id)a1;
- (void)doneButtonPressed;
- (void)dismissView;
- (void)configureWithPlayers:(id)a0 groupName:(id)a1 caption:(id)a2 playerSelectionProxy:(id)a3;

@end