Question 67310 in IOS Swift Question posted in
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Make a pdf document by Image using PDFKit in iOS 16 – Ios swift

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:

Original Image

PDF preview in PDFView:

PDF preview Image in PDFView

Tags:

2

Answers


  1. 0

    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

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  2. 0

    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) {        
    }
}
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