保存CoreGraphics绘图操作？

Question

我有什么办法可以做点什么：

@implementation MyView

- (void)drawRect:(CGRect)rect
{
   // Get the thing I'm supposed to draw (CGImageRef, pattern, etc.) and draw it
   // i.e. not real code
   CGContextDrawWhatever(self.objectThatHoldsDrawing.drawing);
}

Answer 1

查看CGPathRef，CGLayer（或者甚至只是CALayer，但这大致等同于drawRect:方法）并渲染（例如缓冲）到图像上下文，只是渲染图像。