将UIimage（拍照）转换为NSData [英] Convert UIimage (take a picture) to NSData

问题描述

我用这种方法拍照。

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;
}

代码应该有效，但变量 imageData = nil
我尝试在PNG中转换图像，但结果相同。

The code should work, but the variable imageData = nil I tried converting the image in PNG, but with the same result.

with print

with print

newImage =，{720,1280} imageData = nil

newImage = , {720, 1280} imageData = nil

推荐答案

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

You must convert CIImage to a CGImage, then CGImage to an UIImage, and then UIImage to 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);

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