CGImage から画素データにアクセス

        let cgimage:CGImage
        let data = cgimage.dataProvider?.data
        let bytes = CFDataGetBytePtr(data)!
        
        let bytesPerPixel = cgimage.bitsPerPixel / cgimage.bitsPerComponent

        for y in 0 ..< cgimage.height {
            for x in 0 ..< cgimage.width {
                    let offset = (y * cgimage.bytesPerRow) + (x * bytesPerPixel)
                    let b = bytes[offset]
                    let g = bytes[offset + 1]
                    let r = bytes[offset + 2]
                }
            }

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