A small portion of my app contains a view were people can take brief notes by drawing on the screen. Currently, I do this by saving the touch points into an array then connecting the dots in drawRect. I know that this isn't the best way to do this but this is only a small portion of my app.A small portion of my app contains a view were
阅读背景：
承诺从触摸事件而不是大数组绘图
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