Swift PDFKit draw multiple images in a single PDFPage - swift

Question

I'm trying to draw multiple images into a single PDFPage.
Looking at the docs and over StackOverflow seems like the best I got is to use PDFPage with an UIImage initializer like so:
let pdfPage = PDFPage(image: image)
But it just creates a page with a full-page image. I tried to draw the images using CGContext but I don't understand how to use PDFPage within a drawing context for it to draw the images rapidly like in the example below.
let bounds = page.bounds(for: .cropBox)
// Create a `UIGraphicsImageRenderer` to use for drawing an image.
let renderer = UIGraphicsImageRenderer(bounds: bounds, format: UIGraphicsImageRendererFormat.default())
let image = renderer.image { (context) in
// How do I rapidly draw them here?
}
Any help will be highly appreciated!
The result I get with PDFPage(image: <UIImage>) vs expected result:

Answer 1

You probably need to improve the positioning logic for the image in the loop, but this should point you to the right direction.
import UIKit
import PDFKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let pdfView = PDFView()
pdfView.frame = CGRect(x: 0, y: 50, width: view.frame.width, height: view.frame.height - 50)
if let d = createPDFDocument() {
pdfView.document = d
}
view.addSubview(pdfView)
}
func createPDFDocument() -> PDFDocument? {
let pdfDocument = PDFDocument()
let page = PDFPage()
let bounds = page.bounds(for: .cropBox)
let imageRenderer = UIGraphicsImageRenderer(bounds: bounds, format: UIGraphicsImageRendererFormat.default())
let image = imageRenderer.image { (context) in
context.cgContext.saveGState()
context.cgContext.translateBy(x: 0, y: bounds.height)
context.cgContext.concatenate(CGAffineTransform.init(scaleX: 1, y: -1))
page.draw(with: .mediaBox, to: context.cgContext)
context.cgContext.restoreGState()
// Improve logic for image position
Range(1...4).forEach { value in
let image = UIImage(named: "YOUR_IMAGE_NAME")
let rect = CGRect(x: 50 * value, y: 0, width: 40, height: 100)
image?.draw(in: rect)
}
}
let newPage = PDFPage(image: image)!
pdfDocument.insert(newPage, at: 0)
return pdfDocument
}
}