System/Library/PrivateFrameworks/PaperKit.framework

PaperKit.VerticalOpacityView.h

NSObject
>
UIResponder
>
UIView

@interface PaperKit.VerticalOpacityView : UIView

- (id)initWithFrame:(struct CGRect { struct CGPoint { double x0; double x1; } x0; struct CGSize { double x0; double x1; } x1; })a0;
- (id)initWithCoder:(id)a0;

@end