System/Library/PrivateFrameworks/MPUFoundation.framework

MPUStackItemView.h

NSObject
>
UIResponder
>
UIView

@interface MPUStackItemView : UIView

- (void)setCenter:(struct CGPoint { double x0; double x1; })a0;
- (void)prepareForReuse;
- (void)didCompleteItemViewConfiguration;
- (void)willBeginItemViewConfiguration;

@end