Is there something special I must know when drawing images in core graphics?
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04-10-2019 - |
문제
Before the retina display came to iOS, I've developed some controls which are drawn using stretchable images and lots of core graphics code.
Now I tested it on a retina display device, and the graphics are misplaced and distorted. Everything else that's loaded with @2x suffix and UIImage imageNamed works fine.
I assume there must be some special considerations when using images in core graphics. For example, I obtain the CGImage from an UIImage very often.
Does anyone know?
해결책
UIImage
is a facade on top of CGImage
(and IOSurface
as a private API). Since CGImage
has no concept of scale, it will reflect the actual size of the image's buffer--for @2x images, the CGImage
dimensions will be twice what the UIImage
's size are.
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