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swift4 ,如何获取UIImage 图片的大小?

swift 获取UIimage 图片 大小

 **let** data: Data = UIImageJPEGRepresentation(image!,0.5)!

 **let** imageSize: Float = Float(data.count/1024)

 print("图片原来的尺寸:(imageSize) kb")

这个方法好像有问题。。输入 1 输入 0.5 都不准


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