Make a pdf document by Image using PDFKit in iOS 16 - ios

Question

while we make a pdf using an image file at that we add an image into PDFPage. at that time PDFDocument did not show the original image content in PDFView in iOS 16. I checked the same code which worked properly in iOS 15. For both test cases, I used New Xcode 14, and as well as previously uploaded TestFlight build also worked properly with iOS 15 or below but did not work with iOS 16. So I request to the apple developer who worked on PDFkit please check this case. I may be sure that there is an issue with iOS 16 and I hope apple provides a new iOS 16 sub-version release as soon as possible with includes this bug fix. here is the sample code that I used:-
let images = [UIImage]()
let pdfDocument = PDFDocument()
for (index,image) in images.enumerated(){
// Create a PDF page instance from your image
let pdfPage = PDFPage(image: image)
// Insert the PDF page into your document
pdfDocument.insert(pdfPage!, at: index)
}
Original Image:
PDF preview in PDFView:

Answer 1

My guess is there's an issue with the default color space in PDFKit: RGB vs CMYK
Here's a workaround:
class func imageToPDF(_ image:UIImage) -> Data {
let data = NSMutableData()
let bounds = CGRect(origin: CGPoint.zero, size: image.size)
UIGraphicsBeginPDFContextToData(data, bounds, nil)
UIGraphicsBeginPDFPage()
image.draw(at: CGPoint.zero)
UIGraphicsEndPDFContext()
return data as Data
}
You'll have to alter it for multiple pages in your instance

Answer 2

Try to remove alpha channel from the image before inserting it into PDFPage. Below is an example how to remove alpha channel from UIImage. Tested with iOS 16.1.
extension UIImage {
func removeAlpha() -> UIImage {
let format = UIGraphicsImageRendererFormat()
format.opaque = true
format.scale = scale
return UIGraphicsImageRenderer(size: size, format: format).image { _ in
draw(in: CGRect(origin: .zero, size: size))
}
}
}
struct PhotoDetailView: UIViewRepresentable {
let image: UIImage
func makeUIView(context: Context) -> PDFView {
let view = PDFView(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.height))
view.document = PDFDocument()
// {{ REMOVE ALPHA BEFORE INSERTING TO PDF
guard let page = PDFPage(image: image.removeAlpha()) else { return view }
// }}
view.document?.insert(page, at: 0)
view.pageBreakMargins = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
view.minScaleFactor = 1
view.maxScaleFactor = 10
view.autoScales = true
view.backgroundColor = .clear
return view
}
func updateUIView(_ uiView: PDFView, context: Context) {
}
}