yaozhuoyu

/*
Source: Apple Developer - Understanding iOS View Compositing
Note: setting view.layer.cornerRadius and .masksToBounds
sends the view for rending to an offscreen buffer.
We want to avoid unnecessary rendering passes. 
Let the context do the work. 
*/

- (void)drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx {
	CGRect rect = layer.bounds;