swift – Tips on how to add rotated picture(stamp) annotation to PDF utilizing iOS PDFKit

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I’m including stamp annotation to PDF file, its working nice after I do not rotate picture however when there’s rotation then annotation is getting clipped from corners. You’ll be able to see this in connected picture.

Right here is the code to create ImageAnnotation

import PDFKit
import UIKit

remaining class ImageAnnotation: PDFAnnotation {
    var picture: UIImage
    var currentRotationAngle: CGFloat = 0.0
    
    init(bounds: CGRect, picture: UIImage) {
        self.picture = picture
        tremendous.init(bounds: bounds, forType: .stamp, withProperties: nil)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been applied")
    }
    
    override func draw(with field: PDFDisplayBox, in context: CGContext) {
        context.saveGState()
        let midX = bounds.midX
        let midY = bounds.midY
        context.translateBy(x: midX, y: midY)
        context.rotate(by: -currentRotationAngle)
        context.translateBy(x: -midX, y: -midY)
        
        guard let cgImage = picture.cgImage else { return }
        context.draw(cgImage, in: bounds)
        context.restoreGState()
    }
}

That is how I’m including ImageAnnotation sticker to pdf overlay after which changing to annotation when person faucet outdoors of annotation sticker view.

Code so as to add Picture sticker view to PDF overlay

func addImage(_ picture: UIImage) {
        var rect = frameForImage(picture, inside: overlayView)
        rect.origin.x = overlayView.middle.x - rect.width / 2
        rect.origin.y = overlayView.middle.y - rect.peak / 2
        self.body = rect
        
        let imageView = UIImageView(picture: picture)
        imageView.isUserInteractionEnabled = true
        addSubview(imageView)
        imageView.translatesAutoresizingMaskIntoConstraints = false
        
        NSLayoutConstraint.activate([
            imageView.topAnchor.constraint(equalTo: imageView.superview!.topAnchor, constant: 24),
            imageView.leadingAnchor.constraint(equalTo: imageView.superview!.leadingAnchor, constant: 24),
            imageView.trailingAnchor.constraint(equalTo: imageView.superview!.trailingAnchor, constant: -24),
            imageView.bottomAnchor.constraint(equalTo: imageView.superview!.bottomAnchor, constant: -24)
        ])
    }

This methodology add precise annotation to PDFDocument

func addImageAnnotation(picture: UIImage) {
        guard let imageView = firstView(kind: UIImageView.self) else {
            return
        }
        let frameAfterMargin = CGRect(x: middle.x - imageView.bounds.width / 2,
                                      y: middle.y - imageView.bounds.peak / 2,
                                      width: imageView.bounds.width,
                                      peak: imageView.bounds.peak)
        let viewFrame = overlayView.convert(frameAfterMargin, to: pdfView)
        let annotationBounds = pdfView.convert(viewFrame, to: pdfPage)
        let annotation = ImageAnnotation(bounds: annotationBounds, picture: picture)
        annotation.currentRotationAngle = rotationAngle
        pdfPage.addAnnotation(annotation)
    }

You’ll be able to entry the pattern undertaking right here to rapidly attempt it out
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