How to vibe codePDF Expert

Prerequisites

• Mac

  Required for macOS native development using Xcode and Swift.

• XcodeFree

  Required IDE for compiling Swift, SwiftUI, and AppKit/UIKit native applications.

• Node.jsFree

  Required for running build scripts and backend utilities if adding web copilot features.

• GitHubFree

  Version control and repository hosting.

AI coding tools

• Claude Code

  Best-in-class agentic coding tool for scaffolding complex codebases and managing multi-file architecture directly from your terminal.

• Cursor

  Provides an AI-native code editor experience for reviewing swift code diffs and refining UI components.

Build guide

1. 01Scaffold Native macOS Document Workspace

   Initialize a native macOS application using Swift and SwiftUI with a split-view document sidebar, file browser, and tabbed document interface.

   Create a new macOS document-based application using SwiftUI. Implement a primary navigation split view with a sidebar for 'Recents', 'My Files', 'Favorites', and 'Cloud Connections'. The main detail area should feature a tabbed document interface allowing multiple PDF files to be open simultaneously. Configure AppKit window delegates to handle file opening via drag-and-drop and standard system open dialogs. Ensure clean separation between document state and UI views, utilizing observable view models for document management.

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2. 02Integrate PDFKit Rendering and Navigation

   Wrap Apple's native PDFKit framework to provide high-performance document viewing, page scrolling, thumbnail sidebar, and search indexing.

   Integrate Apple's PDFKit framework into the SwiftUI application by wrapping PDFView and PDFDocument in a platform-native NSViewRepresentable / UIViewRepresentable component. Add support for continuous vertical and horizontal page scrolling, single-page and two-page spread view modes, day/night/sepia reading theme overrides via core graphics color inversion, and a thumbnail sidebar drawer. Implement an instantaneous text search mechanism that highlights matches across the entire document and populates a search history dropdown.

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3. 03Build Core Annotation Toolkit

   Implement annotation capabilities including text highlighting, freehand drawing, sticky notes, shapes, and Apple Pencil ink smoothing.

   Extend the PDF viewer component to support a robust annotation toolbar. Implement highlighting with color pickers, sticky note popups, geometric shapes (rectangles, circles, arrows), and freehand drawing overlays using PKCanvasView for low-latency Apple Pencil stroke capture and smoothing. Serialize annotations directly into the underlying PDFDocument annotation array so they persist when saving the document back to disk or exporting.

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4. 04Add Form Filling and Signature Capabilities

   Enable interactive AcroForms filling and secure electronic signature creation and placement.

   Implement interactive form filling by inspecting PDFDocument form fields (PDFAnnotationSubtypeWidget). Render interactive text boxes, checkboxes, and choice menus over form field boundaries. Add a signature manager that allows users to draw or type a personal electronic signature using mouse, trackpad, or Apple Pencil, and stamp selected signatures onto arbitrary coordinates within the PDF document pages with persistent placement coordinates.

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5. 05Integrate PDF Copilot AI Assistant

   Connect an AI backend using the Vercel AI SDK and Anthropic API to allow users to query and summarize PDF content.

   Build a companion side panel for the PDF viewer called 'PDF Copilot'. Implement text extraction from the active PDFDocument using PDFKit text selection routines. Set up a secure API client using the Vercel AI SDK and Anthropic API to transmit extracted text snippets along with user prompts for document summarization, question answering, and key insight extraction. Render streaming AI responses in a conversational chat interface inside the sidebar.

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6. 06Implement Page Management and Export Tools

   Add page reordering, rotation, deletion, merging, and file export capabilities.

   Create a visual page grid editor view that displays thumbnail representations of all pages in the active PDFDocument. Implement drag-and-drop page reordering, individual page rotation, page deletion, and page insertion from external files. Build a file combiner utility that merges multiple PDFDocuments into a single file and exports the result using standard file save panels.

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Cost vs paying for PDF Expert