iOS: How do I support Retina Display with CGLayer?I'm drawing a graph on a CALayer in its delegate method drawLayer:inContext:. Now I want to support Retina Display, as the graph looks blurry on the latest devices. For the parts that I draw directly on the graphics context passed by the CALayer, I could nicely draw in high resolution by setting the CALayer's contentScale property as follows. if ([myLayer respondsToSelector:@selector(setContentsSc
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