System/Library/PrivateFrameworks/NanoTimeKit.framework

_NTKPieChartView.h

NSObject
>
UIResponder
>
UIView

@interface _NTKPieChartView : UIView

+ (Class)layerClass;

- (id)initWithFrame:(struct CGRect { struct CGPoint { double x0; double x1; } x0; struct CGSize { double x0; double x1; } x1; })a0;
- (void)setProgress:(double)a0 animated:(BOOL)a1;

@end