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画板2.0
更新了之前写的那个画板，做了功能的加强，添加了椭圆、矩形、直线的工具，添加了画笔颜色。今天太晚了，等之后有时间写吧。今天先上一波代码 …
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关于UIPageControl的frame 问题
Discuss about when UIPageControl is in an auto-layout environment, sometimes we should use frame to locate UIPageControl, and in some situation we will lose control of it. …