如何旋转nscell

Question

我正在创建NSLevelIndicatorCell的一个子类，我想垂直绘制它。这不起作用，我哪里做错了？

- (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];}

Answer 1

[self setBoundsRotation:90];

[self setNeedsDisplay];

现在，我只需要弄清楚如何让可调整大小的边缘从水平变为垂直……