Convert UIimage (photo library or camera) into PDF in iPhone Files - ios

Question

I include VNDocumentCameraViewControllerDelegate in my class
To "scan the document", I used this code:
#IBAction func scanButton(_ sender: UIButton) {
let scannerViewController = VNDocumentCameraViewController()
scannerViewController.delegate = self
present(scannerViewController, animated: true)
}
In viewDidLoad, I include the PDFView
override func viewDidLoad() {
super.viewDidLoad()
pdfView = PDFView()
pdfView.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(pdfView)
pdfView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor).isActive = true
pdfView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor).isActive = true
pdfView.topAnchor.constraint(equalTo: startOutlet.bottomAnchor).isActive = true
pdfView.bottomAnchor.constraint(equalTo: PDFOutlet.topAnchor).isActive = true
PDFOutlet.isHidden = true }
I add the documentCameraViewController functions
func documentCameraViewController(_ controller: VNDocumentCameraViewController, didFinishWith scan: VNDocumentCameraScan) {
guard scan.pageCount >= 1 else {
controller.dismiss(animated: true)
return
}
DispatchQueue.main.async {
let pdfDocument = PDFDocument()
for i in 0 ..< scan.pageCount {
if let image = scan.imageOfPage(at: i).resize(toWidth: 250) {
print("image size is \(image.size.width), \(image.size.height)")
// Create a PDF page instance from your image
let pdfPage = PDFPage(image: image)
// Insert the PDF page into your document
pdfDocument.insert(pdfPage!, at: i)
}
}
// Retrieve raw data of your PDF document
let data = pdfDocument.dataRepresentation()
let documentDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
let docURL = documentDirectory.appendingPathComponent("Scanned-Docs.pdf")
do {
try data?.write(to: docURL)
}
catch(let error)
{
print("error is \(error.localizedDescription)")
}
}
controller.dismiss(animated: true)
PDFOutlet.isHidden = false
}
func documentCameraViewController(_ controller: VNDocumentCameraViewController, didFailWithError error: Error) {
print(error)
controller.dismiss(animated: true)
}
func documentCameraViewControllerDidCancel(_ controller: VNDocumentCameraViewController) {
controller.dismiss(animated: true)
}
}
extension SnapToPDF: UINavigationControllerDelegate {
// Not used, but necessary for compilation
}
extension UIImage {
func resize(toWidth width: CGFloat) -> UIImage? {
let canvas = CGSize(width: width, height: CGFloat(ceil(width/size.width * size.height)))
return UIGraphicsImageRenderer(size: canvas, format: imageRendererFormat).image {
_ in draw(in: CGRect(origin: .zero, size: canvas))
}
}
I want to have a button for users to click the save the PDF that they have selected, but this part of the code isn't working. Everything else above works, and in the app, I can take a photo and resize it, or choose from photo library. Ideally, wanted to show options for the user to save the PDF into their Files in the iPhone, but it is not working. The button does nothing. Please help!
#IBAction func viewPDFButton(_ sender: UIButton) {
let fileManager = FileManager.default
let documentDirectory = fileManager.urls(for: .documentDirectory, in: .userDomainMask).first!
let docURL = documentDirectory.appendingPathComponent("Scanned-Docs.pdf")
if fileManager.fileExists(atPath: docURL.path){
pdfView.document = PDFDocument(url: docURL)
}
else {
print("file does not exist..")
}
}