我正在制作 NSLevelIndicatorCell 的子类,我想垂直绘制它。这不起作用,我做错了什么?
- (void)drawWithFrame:(NSRect)cellFrame inView:(NSView *)controlView{
[[NSGraphicsContext currentContext] saveGraphicsState];
NSAffineTransform *transform = [NSAffineTransform transform];
[transform rotateByDegrees:90];
[transform concat];
[super drawWithFrame:cellFrame inView:controlView];
[[NSGraphicsContext currentContext] restoreGraphicsState];}