Pdfkit

import PDFKit

import PDFKitimport UIKit
class PDFViewController: UIViewController {    let pdfView = PDFView()
    override func viewDidLoad() {        super.viewDidLoad()        pdfView.frame = view.bounds        pdfView.autoresizingMask = [.flexibleWidth, .flexibleHeight]        view.addSubview(pdfView)
        pdfView.autoScales = true        pdfView.displayMode = .singlePageContinuous        pdfView.displayDirection = .vertical
        if let url = Bundle.main.url(forResource: "sample", withExtension: "pdf") {            pdfView.document = PDFDocument(url: url)        }    }}

pdfView.autoScales = truepdfView.minScaleFactor = pdfView.scaleFactorForSizeToFitpdfView.maxScaleFactor = 4.0
pdfView.displaysPageBreaks = truepdfView.pageShadowsEnabled = truepdfView.interpolationQuality = .high

let fileDoc = PDFDocument(url: fileURL)let dataDoc = PDFDocument(data: pdfData)let emptyDoc = PDFDocument()

guard let document = PDFDocument(url: url) else { return }if document.isLocked {    if !document.unlock(withPassword: userPassword) {        // Show password prompt    }}

document.write(to: outputURL)document.write(to: outputURL, withOptions: [    .ownerPasswordOption: "ownerPass", .userPasswordOption: "userPass"])let data = document.dataRepresentation()
// Pages are zero-based. Validate indices; out-of-range calls raise exceptions.let count = document.pageCountdocument.insert(PDFPage(), at: count)if document.pageCount > 2 {    document.removePage(at: 2)}if document.pageCount > 3 {    document.exchangePage(at: 0, withPageAt: 3)}

// Go to a specific pagelet pageIndex = 5if let document = pdfView.document,   pageIndex >= 0,   pageIndex < document.pageCount,   let page = document.page(at: pageIndex) {    pdfView.go(to: page)}
// Sequential navigationpdfView.goToNextPage(nil)pdfView.goToPreviousPage(nil)pdfView.goToFirstPage(nil)pdfView.goToLastPage(nil)
// Check navigation stateif pdfView.canGoToNextPage { /* ... */ }
// History navigationif pdfView.canGoBack { pdfView.goBack(nil) }
// Go to a specific point on the current pageif let page = pdfView.currentPage {    let destination = PDFDestination(page: page, at: CGPoint(x: 0, y: 500))    pdfView.go(to: destination)}

NotificationCenter.default.addObserver(    self, selector: #selector(pageChanged),    name: .PDFViewPageChanged, object: pdfView)
@objc func pageChanged(_ notification: Notification) {    guard let page = pdfView.currentPage,          let doc = pdfView.document else { return }    let index = doc.index(for: page)    pageLabel.text = "Page \(index + 1) of \(doc.pageCount)"}

let results: [PDFSelection] = document.findString(    "search term", withOptions: [.caseInsensitive])

// Find next match from current selectionlet next = document.findString("term", fromSelection: current, withOptions: [.caseInsensitive])
// System find bar; apply the Setup availability gatepdfView.isFindInteractionEnabled = true

let fullText = document.string                          // Entire documentlet firstPage = document.pageCount > 0 ? document.page(at: 0) : nillet pageText = firstPage?.string                        // Single pagelet attributed = firstPage?.attributedString            // With formatting
// Region-based extractionif let page = firstPage {    let selection = page.selection(for: CGRect(x: 50, y: 50, width: 400, height: 200))    let text = selection?.string}

let results = document.findString("important", withOptions: [.caseInsensitive])for selection in results { selection.color = .yellow }pdfView.highlightedSelections = results
if let first = results.first {    pdfView.setCurrentSelection(first, animate: true)    pdfView.go(to: first)}

func addHighlight(to page: PDFPage, selection: PDFSelection) {    let highlight = PDFAnnotation(        bounds: selection.bounds(for: page),        forType: .highlight, withProperties: nil    )    highlight.color = UIColor.yellow.withAlphaComponent(0.5)    page.addAnnotation(highlight)}

let note = PDFAnnotation(    bounds: CGRect(x: 100, y: 700, width: 30, height: 30),    forType: .text, withProperties: nil)note.contents = "This is a sticky note."note.color = .systemYellownote.iconType = .commentpage.addAnnotation(note)

let freeText = PDFAnnotation(    bounds: CGRect(x: 50, y: 600, width: 300, height: 40),    forType: .freeText, withProperties: nil)freeText.contents = "Added commentary"freeText.font = UIFont.systemFont(ofSize: 14)freeText.fontColor = .darkGraypage.addAnnotation(freeText)

let link = PDFAnnotation(    bounds: CGRect(x: 50, y: 500, width: 200, height: 20),    forType: .link, withProperties: nil)link.url = URL(string: "https://example.com")page.addAnnotation(link)
// Internal page linklink.destination = PDFDestination(page: targetPage, at: .zero)

for annotation in page.annotations {    page.removeAnnotation(annotation)}

let thumbnailView = PDFThumbnailView()thumbnailView.pdfView = pdfViewthumbnailView.thumbnailSize = CGSize(width: 60, height: 80)thumbnailView.layoutMode = .verticalthumbnailView.translatesAutoresizingMaskIntoConstraints = falseview.addSubview(thumbnailView)

let thumbnail = page.thumbnail(of: CGSize(width: 120, height: 160), for: .mediaBox)
// All pageslet thumbnails = (0..<document.pageCount).compactMap {    document.page(at: $0)?.thumbnail(of: CGSize(width: 120, height: 160), for: .mediaBox)}

import SwiftUIimport PDFKit
struct PDFKitView: UIViewRepresentable {    let document: PDFDocument
    func makeUIView(context: Context) -> PDFView {        let pdfView = PDFView()        pdfView.autoScales = true        pdfView.displayMode = .singlePageContinuous        pdfView.document = document        return pdfView    }
    func updateUIView(_ pdfView: PDFView, context: Context) {        if pdfView.document !== document {            pdfView.document = document        }    }}

struct DocumentScreen: View {    let url: URL
    var body: some View {        if let document = PDFDocument(url: url) {            PDFKitView(document: document)                .ignoresSafeArea()        } else {            ContentUnavailableView("Unable to load PDF", systemImage: "doc.questionmark")        }    }}

class OverlayProvider: NSObject, PDFPageOverlayViewProvider {    func pdfView(_ view: PDFView, overlayViewFor page: PDFPage) -> UIView? {        let overlay = UIView()        // Add custom subviews        return overlay    }}
class PDFOverlayController: UIViewController {    let pdfView = PDFView()    private let overlayProvider = OverlayProvider()
    override func viewDidLoad() {        super.viewDidLoad()        pdfView.pageOverlayViewProvider = overlayProvider    }}

// WRONGlet document = PDFDocument(url: url)!
// CORRECTguard let document = PDFDocument(url: url) else { return }

// WRONGpdfView.document = document
// CORRECTpdfView.autoScales = truepdfView.document = document

// WRONG: UIKit coordinateslet bounds = CGRect(x: 50, y: 50, width: 200, height: 30)
// CORRECT: PDF coordinates (origin bottom-left)let pageBounds = page.bounds(for: .mediaBox)let pdfY = pageBounds.height - 50 - 30let bounds = CGRect(x: 50, y: pdfY, width: 200, height: 30)

// WRONGDispatchQueue.global().async { page.addAnnotation(annotation) }
// CORRECTDispatchQueue.main.async { page.addAnnotation(annotation) }

// WRONG: Always replaces documentfunc updateUIView(_ pdfView: PDFView, context: Context) {    pdfView.document = document}
// CORRECTfunc updateUIView(_ pdfView: PDFView, context: Context) {    if pdfView.document !== document {        pdfView.document = document    }}