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I create a UIView and put it on top of an imageView,and set the uiview’s background color as clearcolor,all the drawing take place on that UIView,how can just erase the line I drew on that uiview ?
thanks.
Did you try
CGContextSetBlendMode(context, kCGBlendModeClear)and then draw the area you want to erase. Clearing the context withCGContextClearRectcan be used too if you want to clear the whole screen (or a rectangular part of it).