iOS print NSAttributedString with images as NSTextAttachement to PDF - ios

Question

I'm trying to convert the content of an UITextView to PDF. The UITextView uses an NSAttributedString that contains text and images.
The images are instances of NSTextAttachment.
I went through the UIPrintPageRenderer way passing the UIPrintFormatter that I get from the UITextView through its viewPrintFormatter() function and it works perfectly for the text but I can't see any of the images. It looks like the images are actually taking up space as I can see the empty space between text lines, but no image is being rendered.
I suspect it might be the formatter, but I don't know how to work around it.
Any help is greatly appreciated.
The code I'm using to create the PDF from the NSAttributedString is the following:
public func createPDF(text: NSAttributedString, documentPath: URL, customPrintFormatter: UIPrintFormatter? = nil) {
let printFormatter = customPrintFormatter == nil ? UISimpleTextPrintFormatter(attributedText: text) : customPrintFormatter!
let renderer = UIPrintPageRenderer()
renderer.addPrintFormatter(printFormatter, startingAtPageAt: 0)
// A4 size
let pageSize = CGSize(width: 595.2, height: 841.8)
// create some sensible margins
let pageMargins = UIEdgeInsets(top: 72, left: 72, bottom: 72, right: 72)
// calculate the printable rect from the above two
let printableRect = CGRect(x: pageMargins.left, y: pageMargins.top, width: pageSize.width - pageMargins.left - pageMargins.right, height: pageSize.height - pageMargins.top - pageMargins.bottom)
// and here's the overall paper rectangle
let paperRect = CGRect(x: 0, y: 0, width: pageSize.width, height: pageSize.height)
renderer.setValue(NSValue(cgRect: paperRect), forKey: "paperRect")
renderer.setValue(NSValue(cgRect: printableRect), forKey: "printableRect")
let pdfData = NSMutableData()
UIGraphicsBeginPDFContextToData(pdfData, paperRect, nil)
renderer.prepare(forDrawingPages: NSMakeRange(0, renderer.numberOfPages))
let bounds = UIGraphicsGetPDFContextBounds()
for i in 0 ..< renderer.numberOfPages {
UIGraphicsBeginPDFPage()
renderer.drawPage(at: i, in: bounds)
}
UIGraphicsEndPDFContext()
do {
try pdfData.write(to: documentPath)
} catch {
print(error.localizedDescription)
}
}
The following is the code that creates the NSTextAttachment
let attachment = NSTextAttachment()
attachment.image = UIImage.init(named: "1.png")
attachment.bounds = CGRect.init(x: 0, y: 0, width: 200, height: 100)
let img = NSMutableAttributedString.init(attachment: attachment)
let imgRange = NSRange.init(location: match.range(at: 0).location + match.range(at: 0).length, length: img.length)
self.beginEditing()
backingStore.insert(img, at: match.range(at: 0).location + match.range(at: 0).length)
let r = NSMakeRange(match.range(at: 0).location + match.range(at: 0).length, img.length)
self.edited([.editedCharacters, .editedAttributes], range: range, changeInLength: img.length)
self.endEditing()