Pdfkit

If you're building a Swift app that needs to show, search, or mark up PDFs, this gives you the complete PDFKit playbook. It covers everything from dropping a PDFView into your controller and wiring up page navigation to running async searches, extracting text from specific regions, and adding annotations like highlights, sticky notes, and form widgets. The skill includes thumbnail strips, SwiftUI wrappers, and password-protected document handling. PDFKit ships with iOS so there's no external dependency, and this reference gets you past the awkward API surface with working examples for each feature. Solid if you're doing anything beyond just displaying a static PDF.