PDFKit (iOS)

Render, navigate, annotate, search, and fill PDFs. import PDFKit. iOS 11+; this skill targets the iOS 26 era. PDFKit is UIKit-based — there is no native SwiftUI PDFView, so wrap it with UIViewRepresentable (see swiftui-uikit-interop).

• Threading: PDFView and all UI live on the main thread. Loading a large PDFDocument, rendering thumbnails, and write(to:) are expensive — run them off the main actor and hand the finished object back to the view.
• Fintech note: never write account statements/receipts to a world-readable path. Export to an app-sandbox URL and, if it leaves the device or persists, encrypt at rest — see swift-security. PDFKit's own owner/user passwords (below) are AcroForm encryption, not a substitute for file-level protection.

Contents