Description
I am having issue with UIImage "generated" from PDFPage via method .thumbnail(of:for). UIImage, which I later display in UIImageView does not respect rotation of the PDF page, but for iOS 13 only.
When PDF page is rotated for example by 90° and presented in PDFView all is good and shown correctly. But when I want to take the UIImage (i.e. thumbnail) of the PDFPage and show it in UIImageView, for some reason, iOS 13 does not respect the initial rotation of the PDF page and present it in UIImageView incorrectly.
Please behold on below sample code and example screenshots.
Testing environment
iOS 13 on simulator only, not having real device
Xcode 13.1
Sample code
for sake of shorter example, I force unwrap where optionals occur
import UIKit
import PDFKit
class TestingViewController: UIViewController {
lazy var imageView: UIImageView = {
let iv = UIImageView()
iv.translatesAutoresizingMaskIntoConstraints = false
return iv
}()
// Pass URL of the PDF document when instantiating this VC
init(withURL: URL) {
super.init(nibName: nil, bundle: nil)
let pdfDoc = PDFDocument(url: withURL)
let pdfPage = pdfDoc!.page(at: 0) // Getting first page of the doc
let pdfPageRect = pdfPage!.bounds(for: .mediaBox)
imageView.image = pdfPage!.thumbnail(of: pdfPageRect.size, for: .mediaBox) // Getting the UIImage of the PDF page and assign it to the needed image view
imageView.contentMode = .scaleAspectFit
imageView.clipsToBounds = true
print("\(pdfPage?.rotation)") // Prints the correct rotation value, even though UIImageView does not respect it
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
// Layout only
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .systemPink
view.addSubview(imageView)
NSLayoutConstraint.activate([
imageView.centerXAnchor.constraint(equalTo: view.centerXAnchor),
imageView.centerYAnchor.constraint(equalTo: view.centerYAnchor),
imageView.widthAnchor.constraint(equalToConstant: 350),
imageView.heightAnchor.constraint(equalToConstant: 700),
])
}
}
Example screenshots from simulator
✅ Presented correctly (iOS 15)
❌ Presented incorrectly (iOS 13.2)