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swift - CGImage 到 CVPixelBuffer

如何转换CGImage到CVPixelBufferswift?我知道很多问题试图做相反的事情,还有一些客观的C答案,比如thisone但我无法让他们swift工作。这是我得到的最接近的:funcpixelBufferFromCGImage(image:CGImage)->CVPixelBuffer{varpxbuffer:CVPixelBuffer?=nilletoptions:NSDictionary=[:]letwidth=image.widthletheight=image.heightletbytesPerRow=image.bytesPerRowletdataFromImag