CGImageRef is nil?

I'm trying to take pictures in my app using AVFoundatin. In the didFinishProcessingPhoto block I run some code to gather the image data and create an image to show in the preview screen. Code included below:

didFinishProcessingPhoto

func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
if let error = error {
print("Error capturing photo: (error)")
} else {
let photoData = photo.fileDataRepresentation()

if let currentData = photoData {
let dataProvider = CGDataProvider(data: currentData as CFData)
let cgImageRef = CGImage(jpegDataProviderSource: dataProvider!, decode: nil, shouldInterpolate: true, intent: CGColorRenderingIntent.defaultIntent)
let image = UIImage(cgImage: cgImageRef!, scale: 1.0, orientation: self.getImageOrientation(forCamera: self.videoDeviceInput.device.position))
let containerView = PreviewPhotoContainerView()
self.view.addSubview(containerView)
containerView.previewImageView.image = image
containerView.snp.makeConstraints { (make) in
make.edges.equalTo(self.view)
}
}
}
}


However, every time I take a picture I get an error that something that is nil is being unwrapped. After some digging I found that it was CGImageRef. However, I can't see where I went wrong.

CGImageRef

photo.cgImageRepresentation()

UIImage

!

1 Answer
1

You can extract the image safely as below,

if let photoData = photo.fileDataRepresentation(), let image = UIImage(data: photoData) {
let containerView = PreviewPhotoContainerView()
self.view.addSubview(containerView)
containerView.previewImageView.image = image
containerView.snp.makeConstraints { (make) in
make.edges.equalTo(self.view)
}
}


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