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並前往https://www.hackingwithswift.com/read/27/3/drawing-into-a-core-graphics-context-with-uigraphicsimagerenderer

Drawing into a Core Graphics context with ...

cgContext , using a parameter that does the actual work. So for setting colors the parameter is the color to set (remember how to convert UIColor values to ...

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查詢 「CGContext」的人也找了：

  1. CGContextRef
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  6. Coregraphics
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  8. UIGraphicsGetCurrentContext
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