12.剪裁图片

剪裁图片swift iOS

https://www.jianshu.com/p/4ce7341b8f02

https://developer.apple.com/documentation/coregraphics/cgimage/1454683-cropping

52A85680-9685-4843-8695-107B6FF10E1E.png

7D82DE32-DD04-41AF-A89C-DCDF21550C53.png

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