How to get the graphics context of an UIView?

For example, I want to draw something directly to an UIView. I need an CGContextRef, but I don't want to make a new one since that would eat up too much memory. Can I obtain the CGContextR开发者_如何学运维ef from an UIView?

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Only in the drawRect method:

UIGraphicsGetCurrentContext()

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Outside of the redraw call, I do not believe so. I remember trying this myself a while ago. Sorry I can't be more specific, but I've not touched the iPhone SDK in months.