How do I disable to edit PDFAnnotations?

Question

I'm builting iOS app in Swift 4.2 that can make signature to PDF file. But in case Embeding the signature as PDFAnnotation, it can editable in apple's Preview app or other app which can edit pdf. How can I disable to edit PDFAnnoations ??

"Signature" is creates by UIImage which converted handwriting beizerpaths.

class SignatureAnnotation: PDFAnnotation {

    var image: UIImage!

    init(with image: UIImage!, forBounds bounds: CGRect, withProperties properties: [AnyHashable : Any]?) {
        super.init(bounds: bounds,
                   forType: PDFAnnotationSubtype.freeText,
                   withProperties: properties) 
        self.image = image
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError()
    }

    override func draw(with box: PDFDisplayBox, in context: CGContext) {
        guard let cgImage = self.image.cgImage else { return }
        context.draw(cgImage, in: self.bounds)
    }

}

func embedSignatureToPDF() {
    let page = pdfView.currentPage
    let signatureAnnotation = SignatureAnnotation(with: signature, forBounds: signatureRect, withProperties: nil)
        page.addAnnotation(signatureAnnotation)
}

Did you find the answer? , I noticed this behaviour with my app but I didn't find any solution to fix it — Basel, Jan 28 '19 at 12:52

Basel · Accepted Answer · 2019-02-17T12:21:02.213

I finally find a solution!

The idea here is not using PDFAnnotation!.

the Signature is an Image so when user save the PDF

you will use the signature Image to create new PDF and save it to same PDF file

to put your signature where you want it you need the modify X and Y image.draw(in: CGRect(x: 100, y: 100, width: 100, height: 100))

the code below will get the Path of the PDF usually, it saved in Document Folder you just need to send the Path of the file and also the signature image and the function will add the image above the PDF and save it

   func drawOnPDF(path: String , signatureImage:UIImage) {

        // Get existing Pdf reference
    let pdf = CGPDFDocument(NSURL(fileURLWithPath: path))

        // Get page count of pdf, so we can loop through pages and draw them accordingly
    let pageCount = pdf?.numberOfPages


        // Write to file
        UIGraphicsBeginPDFContextToFile(path, CGRect.zero, nil)

        // Write to data
        //var data = NSMutableData()
        //UIGraphicsBeginPDFContextToData(data, CGRectZero, nil)

        for index in 1...pageCount! {

            let page =  pdf?.page(at: index)

            let pageFrame = page?.getBoxRect(.mediaBox)


            UIGraphicsBeginPDFPageWithInfo(pageFrame!, nil)

            let ctx = UIGraphicsGetCurrentContext()

            // Draw existing page
            ctx!.saveGState()

            ctx!.scaleBy(x: 1, y: -1)

            ctx!.translateBy(x: 0, y: -pageFrame!.size.height)
            //CGContextTranslateCTM(ctx, 0, -pageFrame.size.height);
            ctx!.drawPDFPage(page!)
            ctx!.restoreGState()

            // Draw image on top of page
            let image = signatureImage
            image.draw(in: CGRect(x: 100, y: 100, width: 100, height: 100))
            // Draw red box on top of page
            //UIColor.redColor().set()
            //UIRectFill(CGRectMake(20, 20, 100, 100));
        }


        UIGraphicsEndPDFContext()
    }

Thanks @Basil ! I thought that there was only one way to not use PDF Annotation. It will be ok add the signature on which PDF page. That was a really big help — Kazuki Tatai, Feb 18 '19 at 04:31

score 0 · Answer 2 · answered Feb 18 '21 at 08:17

How about change the annotation type to button ?, it will have a overlay everytime you touch the signature but it can't be edited

init(with image: UIImage!, forBounds bounds: CGRect, withProperties properties: [AnyHashable : Any]?) {
    super.init(bounds: bounds, forType: PDFAnnotationSubtype.widget, withProperties: properties)
    self.image = image
    self.isReadOnly = true
    self.widgetFieldType = .button
}

How do I disable to edit PDFAnnotations?

2 Answers2