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更新 README
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CornerRadius/README.md

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# CornerRadius
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都说 `cornerRadius` + `masksToBounds` 会导致离屏渲染,从而大幅度降低 `UITabelView` 滑动时的性能。
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我做了一个 demo,在 cell 中放了四个 UIImageView,但是在 Instument 中检测时并没有发现离屏渲染,滑动时帧数也未见下降。

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