Annotate/Draw on PDF in Swift

Question

I am writing an app that will contain multiple PDF documents that I will display on screen depending on the user's input. Once displayed, I would like to allow the user to draw/annotate on the PDF. I would then like to save the PDF with the drawings/annotations on for later use.

I have searched endlessly for tutorials on annotating a PDF but I am coming back with not much at all!

I have found a cocoapod on GitHub called 'UXMPDF'. Has anyone used this?

Any information on performing this type of operation would be hugely appreciated! Thanks

did you get the answer? – Mohammad Yunus Dec 13 '19 at 09:07 — Mohammad Yunus, Dec 13 '19 at 09:07

Zouhair Sassi · Answer 1 · 2019-08-09T11:09:35.677

First Create PDFView and Load pdfFile:

override func viewDidLoad() {
super.viewDidLoad()    
let pdfView = PDFView(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.height))
        guard let document = PDFDocument(url: YOUR_FILE_PATH) else {
            return
        }
        pdfView.document = document
        pdfView.displayMode = .singlePageContinuous
        pdfView.autoScales = true
        pdfView.displayDirection = .horizontal
        pdfView.autoresizingMask = [.flexibleWidth, .flexibleHeight, .flexibleTopMargin, .flexibleBottomMargin]
        pdfView.maxScaleFactor = 4
        pdfView.delegate = self
        pdfView.minScaleFactor = pdfView.scaleFactorForSizeToFit
        pdfView.usePageViewController(true, withViewOptions: nil)
        pdfView.translatesAutoresizingMaskIntoConstraints = false
        self.view.addSubview(pdfView)
        self.pdfView = pdfView
        self.pdfDocument = document
        let highLightItem = UIMenuItem(title:"Highlight"), action: #selector(highlightFromMenuItem))

    }

you can use pdfAnnotation from UIMenuItem like that:

@objc func highlightFromMenuItem() {
 if let document = self.pdfDocument {
    let pdfSelection : PDFSelection = PDFSelection(document: document)
    pdfSelection.add((self.pdfView?.currentSelection)!)
    let arrayByLines = self.pdfView?.currentSelection?.selectionsByLine()
        arrayByLines?.forEach({ (selection) in
            let annotation = PDFAnnotation(bounds: selection.bounds(for: (self.pdfView?.currentPage)!), forType: .highlight, withProperties: nil)
            annotation.color = .yellow
            self.pdfView?.currentPage?.addAnnotation(annotation)
        })
     }
   }

If you want to save what did you did:

self.pdfView.document.write(to:YOUR_FILE_URL)

other pdfAnnotation you can use:

.underline
.strikeOut
.circle
.square

my program annotate the pdf file and correctly show in the view also correctly save in the doc directory, but in debugging area gettingmsg Failed to load /System/Library/PrivateFrameworks/CorePDF.framework/Versions/A/CorePDF Error: Attempting to save dictionary with key: . Dictionary keys must be of type string Error: Attempting to save dictionary with key: . Dictionary keys must be of type string. Error: Could not create dictionary value for key: /DR. Invalid value. Error: Cannot save value for annotation key: /DR. Invalid type. — Codicil, Feb 15 '20 at 05:39

Annotate/Draw on PDF in Swift

1 Answers1

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