iosdevie

func collectionView(_ collectionView: UICollectionView, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
        
        let id = configuration.identifier as! String
        
        animator.addCompletion {
            self.show(SecondViewController(index: Int(id)), sender: self)
        }
}

iosdevie

let pdfDocument = PDFDocument()
for i in 0 ..< scan.pageCount {
   if let image = scan.imageOfPage(at: i).resize(toWidth: 250){
      let pdfPage = PDFPage(image: image)
      pdfDocument.insert(pdfPage!, at: i)        
   }
}

iosdevie

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)")

iosdevie

let pdfView = PDFView()
pdfView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(pdfView)
let docURL = documentDirectory.appendingPathComponent("Scanned-Docs.pdf")
        
if fileManager.fileExists(atPath: docURL.path){
    pdfView.document = PDFDocument(url: docURL)
}

iosdevie

let canvasView = PKCanvasView(frame: .zero) canvasView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(canvasView)
NSLayoutConstraint.activate([ 
  canvasView.topAnchor.constraint(equalTo: navigationBar.bottomAnchor), 
  canvasView.bottomAnchor.constraint(equalTo: view.bottomAnchor), 
  canvasView.leadingAnchor.constraint(equalTo: view.leadingAnchor), 
  canvasView.trailingAnchor.constraint(equalTo: view.trailingAnchor), ])

iosdevie

guard let window = view.window, let toolPicker = PKToolPicker.shared(for: window) else { return }
toolPicker.setVisible(true, forFirstResponder: canvasView) toolPicker.addObserver(canvasView) 
canvasView.becomeFirstResponder()

iosdevie

let canvasView = PKCanvasView(frame: .zero)
canvasView.backgroundColor = .black
canvasView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(canvasView)
NSLayoutConstraint.activate([
   canvasView.topAnchor.constraint(equalTo: navigationBar.bottomAnchor),
   canvasView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
   canvasView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
   canvasView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
])

iosdevie

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
guard
     let window = view.window,
     let toolPicker = PKToolPicker.shared(for: window) else {return}
toolPicker.setVisible(true, forFirstResponder: canvasView)
    toolPicker.addObserver(canvasView)
    canvasView.becomeFirstResponder()
}

iosdevie

func setNavigationBar() {
        if let navItem = navigationBar.topItem{
            
            let detectItem = UIBarButtonItem(title: "Detect", style: .done, target: self, action: #selector(detectImage))
            let clearItem = UIBarButtonItem(title: "Clear", style: .plain, target: self, action: #selector(clear))
navItem.rightBarButtonItems = [clearItem,detectItem]
            navItem.leftBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: self, action: nil)
            
        }
}

iosdevie

func preprocessImage() -> UIImage{
        var image = canvasView.drawing.image(from: canvasView.drawing.bounds, scale: 10.0)
        if let newImage = UIImage(color: .black, size: CGSize(width: view.frame.width, height: view.frame.height)){
if let overlayedImage = newImage.image(byDrawingImage: image, inRect: CGRect(x: view.center.x, y: view.center.y, width: view.frame.width, height: view.frame.height)){
                image = overlayedImage
            }
        }
}