I had project going great, where i needed to do stuff with pdfs, drawing on top them etc. Since apple is all closed sourced i needed to become a bit hacky. Anyways, i have a problem since the new ios 26 update which breaks the behaviour. I simplified the code very much into a demo project, where you can quickly see what's wrong.
When swiping left to go to the next page, it does change the page etc in the pdf Document, but visually nothing happens. I am stuck on the first page. I dont know what to do, tried a lot of things, but nothing works. Anyone skilled enough to help me out?
import UIKit
import PDFKit
import SwiftUI
class PDFViewController: UIViewController {
var pdfView: PDFView!
var gestureHandler: GestureHandler!
override func viewDidLoad() {
super.viewDidLoad()
setupPDFView()
setupGestureHandler()
loadPDF()
}
private func setupPDFView() {
pdfView = PDFView(frame: view.bounds)
// Your exact configuration
pdfView.autoScales = true
pdfView.pageShadowsEnabled = false
pdfView.backgroundColor = .white
pdfView.displayMode = .singlePage
view.addSubview(pdfView)
// Setup constraints
pdfView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
pdfView.topAnchor.constraint(equalTo: view.topAnchor),
pdfView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
pdfView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
pdfView.bottomAnchor.constraint(equalTo: view.bottomAnchor)
])
}
private func setupGestureHandler() {
gestureHandler = GestureHandler(pdfView: pdfView)
gestureHandler.setupSwipeGestures(on: view)
}
private func loadPDF() {
if let path = Bundle.main.path(forResource: "sonate12", ofType: "pdf"),
let document = PDFDocument(url: URL(fileURLWithPath: path)) {
pdfView.document = document
} else {
print("Could not find sonate12.pdf in bundle")
}
}
}
class GestureHandler {
private weak var pdfView: PDFView?
init(pdfView: PDFView) {
self.pdfView = pdfView
}
func setupSwipeGestures(on view: UIView) {
// Left swipe - go to next page
let leftSwipe = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipe(_:)))
leftSwipe.direction = .left
view.addGestureRecognizer(leftSwipe)
// Right swipe - go to previous page
let rightSwipe = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipe(_:)))
rightSwipe.direction = .right
view.addGestureRecognizer(rightSwipe)
}
@objc private func handleSwipe(_ gesture: UISwipeGestureRecognizer) {
guard let pdfView = pdfView,
let document = pdfView.document,
let currentPage = pdfView.currentPage else {
print("🚫 No PDF view, document, or current page available")
return
}
let currentIndex = document.index(for: currentPage)
let totalPages = document.pageCount
print("📄 Current state: Page \(currentIndex + 1) of \(totalPages)")
print("👆 Swipe direction: \(gesture.direction == .left ? "LEFT (next)" : "RIGHT (previous)")")
switch gesture.direction {
case .left:
// Next page
guard currentIndex < document.pageCount - 1 else {
print("🚫 Already on last page (\(currentIndex + 1)), cannot go forward")
return
}
let nextPage = document.page(at: currentIndex + 1)
if let page = nextPage {
print("➡️ Going to page \(currentIndex + 2)")
pdfView.go(to: page)
pdfView.setNeedsDisplay()
pdfView.layoutIfNeeded()
// Check if navigation actually worked
DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
if let newCurrentPage = pdfView.currentPage {
let newIndex = document.index(for: newCurrentPage)
print("✅ Navigation result: Now on page \(newIndex + 1)")
if newIndex == currentIndex {
print("⚠️ WARNING: Page didn't change visually!")
}
}
}
} else {
print("🚫 Could not get next page object")
}
case .right:
// Previous page
guard currentIndex > 0 else {
print("🚫 Already on first page (1), cannot go back")
return
}
let previousPage = document.page(at: currentIndex - 1)
if let page = previousPage {
print("⬅️ Going to page \(currentIndex)")
pdfView.go(to: page)
pdfView.setNeedsDisplay()
pdfView.layoutIfNeeded()
let bounds = pdfView.bounds
pdfView.bounds = CGRect(x: bounds.origin.x, y: bounds.origin.y, width: bounds.width + 0.01, height: bounds.height)
pdfView.bounds = bounds
// Check if navigation actually worked
DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
if let newCurrentPage = pdfView.currentPage {
let newIndex = document.index(for: newCurrentPage)
print("✅ Navigation result: Now on page \(newIndex + 1)")
if newIndex == currentIndex {
print("⚠️ WARNING: Page didn't change visually!")
}
}
}
} else {
print("🚫 Could not get previous page object")
}
default:
print("🤷♂️ Unknown swipe direction")
break
}
}
}
struct PDFViewerRepresentable: UIViewControllerRepresentable {
func makeUIViewController(context: Context) -> PDFViewController {
return PDFViewController()
}
func updateUIViewController(_ uiViewController: PDFViewController, context: Context) {
// No updates needed
}
}
You can look at the code here as well: https://github.com/vallezw/swift-bug-ios26
0
1
318