Unable to convert CIImage to UIImage in Swift 3.0

Question

I am making a QR Code image form using the following code:

  func createQRFromString(str: String) -> CIImage? { let stringData = str.dataUsingEncoding(NSUTF8StringEncoding) let filter = CIFilter(name: "CIQRCodeGenerator") filter?.setValue(stringData, forKey: "inputMessage") filter?.setValue("H", forKey: "inputCorrectionLevel") return filter?.outputImage } 

And then I add to UIImageView Like this:

  if let img = createQRFromString(strQRData) { let somImage = UIImage(CIImage: img, scale: 1.0, orientation: UIImageOrientation.Down) imgviewQRcode.image = somImage } 

Now I need to save this in a JPEG or PNG file. But when I do this, my application crashes:

  @IBAction func btnSave(sender: AnyObject) { // // Define the specific path, image name let documentsDirectoryURL = try! NSFileManager().URLForDirectory(.DocumentDirectory, inDomain: .UserDomainMask, appropriateForURL: nil, create: true) // create a name for your image let fileURL = documentsDirectoryURL.URLByAppendingPathComponent("image.jpg") if let image = imgviewQRcode.image // imgviewQRcode is UIImageView { if let path = fileURL?.path { if !NSFileManager.defaultManager().fileExistsAtPath(fileURL!.path!) { if UIImageJPEGRepresentation(image, 1.0)!.writeToFile(path, atomically: true) { print("file saved") } }//Checking existing file }//Checking path }//CHecking image } 

Crash point

  UIImageJPEGRepresentation(image, 1.0)!.writeToFile(path, atomically: true) 

Cause

 fatal error: unexpectedly found nil while unwrapping an Optional value 

Debugging tests:

Answer 1

 func convert(cmage:CIImage) -> UIImage { let context:CIContext = CIContext.init(options: nil) let cgImage:CGImage = context.createCGImage(cmage, from: cmage.extent)! let image:UIImage = UIImage.init(cgImage: cgImage) return image } 

Use this function to convert CIImage to UIImage. He works.

Answer 2

My last code

  func generateQRCode(from string: String) -> UIImage? { let data = string.data(using: String.Encoding.ascii) if let filter = CIFilter(name: "CIQRCodeGenerator") { filter.setValue(data, forKey: "inputMessage") let transform = CGAffineTransform(scaleX: 3, y: 3) if let output = filter.outputImage?.transformed(by: transform) { let context:CIContext = CIContext.init(options: nil) let cgImage:CGImage = context.createCGImage(output, from: output.extent)! let image:UIImage = UIImage.init(cgImage: cgImage) return image } } return nil }