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Why is it so fuzzy for swift to draw in the context of cglayer?

Why is there such a problem? How to make the cglayer clearer? ... Here is my drawing code. class canvas: UIView { override func drawRect(rect: ...

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查詢 「CGLayer」的人也找了：

  1. CoreGraphics
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  2. Swift CGContext
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  3. Core Graphics Swift
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  4. calayer
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  5. CGImage
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