iphone - How to clear and then redraw a quartz drawing -

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Based on the information I passed, creating a complex drawing using quartz is the only part I have not understood that I How can I clean the rectangles etc., which I have already drawn? Actually, I want to erase the entire drawing and want to recreate it with new data.

If you have the property of your UIView yes , Then the system should remember to fill its code with its code with the backgroundColor drawRect: method.


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