objective-c - NSImage 绘制矩形 :fromRect:operation:fraction results in a flipped image

Question

当我使用时:

[iconImage drawInRect:NSMakeRect(cellFrame.origin.x+5,yOffset+3,cellFrame.size.height-6, cellFrame.size.height-6)
                     fromRect:NSMakeRect(0,0,[iconImage size].width, [iconImage size].height)
                    operation:NSCompositeSourceOver
                     fraction:1.0];

要在 NSOutlineView 单元格中绘制一些图像，图像会垂直上下颠倒。我该如何解决？

谢谢

Answer 1

使用方法

- (void)drawInRect:(NSRect)dstSpacePortionRect
          fromRect:(NSRect)srcSpacePortionRect
         operation:(NSCompositingOperation)op
          fraction:(CGFloat)requestedAlpha
    respectFlipped:(BOOL)respectContextIsFlipped
             hints:(NSDictionary *)hints

连同 - (void)lockFocusFlipped:(BOOL)flipped

将图像倒过来绘制。来自NSImage Reference手册。