UIView drawRect: when you draw a line, the rect area will be clear so the previous drawing is gone
- by snakewa
It is quite hard to tell so I upload an image to show my problem: http://i42.tinypic.com/2eezamo.jpg
Basically in drawRect, I will draw the line from touchesMoved as finger touches and I will call "needsDisplayInRect" for redraw. But I found that the first line is done, the second line will clear the rect part, so some previouse drawing is gone.
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