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How to clear and then redraw a quartz pattern

I am making a complex drawing using quartz based on the transmitted information. The only part I haven't been able to figure out is how to clear the lines, rectangles, etc. that I've already drawn? Basically, I want to delete the entire drawing and just extract it from the new data.

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If you set the property to a UIView

clearContextBeforeDrawing

value YES

, then the system must take care of filling its scope with its own backgroundColor

before calling the method drawRect:

.



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If you want to clean up something that isn't being tracked as part of the current state then it is probably less expensive, just drop your old context and start a new one.



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