image - 将UIimage(拍照)转成NSData

Question

我用这个方法拍了一张照片。

func convertImageFromCMSampleBufferRef(sampleBuffer:CMSampleBuffer) -> CIImage{
    let pixelBuffer:CVPixelBufferRef = CMSampleBufferGetImageBuffer(sampleBuffer)!;
    let ciImage:CIImage = CIImage(CVPixelBuffer: pixelBuffer)

    if done == true {

        newImage =  UIImage(CIImage:ciImage, scale: CGFloat(1.0), orientation: .DownMirrored)

        var imageData = UIImageJPEGRepresentation(newImage, 0.6)
        var compressedJPGImage = UIImage(data: imageData)
        UIImageWriteToSavedPhotosAlbum(compressedJPGImage!, nil, nil, nil)       
    }

    return ciImage;
}

代码应该可以工作，但是变量 imageData = nil我尝试将图像转换为 PNG，但结果相同。

打印

newImage = , {720, 1280} imageData = nil

Answer 1

您必须将 CIImage 转换为 CGImage，然后将 CGImage 转换为 UIImage，然后将 UIImage 转换为 NSData。

static let context = CIContext(options:nil);
let tempImage:CGImageRef = context.createCGImage(ciImage, fromRect: ciImage.extent())
let image = UIImage(CGImage: tempImage);
let imageData: NSData? = UIImageJPEGRepresentation(image, 0.6);