vfr/Reader
Reader
Reader is an iOS PDF rendering engine and user interface component designed to display PDF documents on Apple platforms. It functions as a document viewer that enables users to navigate pages and interact with embedded content.
The framework manages encrypted files by requesting and verifying security credentials to unlock protected document streams. It utilizes tiled layer rendering and multi-threaded processing to maintain scrolling performance and responsiveness.
The system covers document navigation via gestures and thumbnails, as well as the resolution of internal and external links. It also includes state management to save and restore bookmarks and current page indices across sessions.
Features
- PDF Rendering Engines - Provides a native rendering engine that decodes PDF data and rasterizes pages for iOS display.
- Page Traversal - Enables page movement through swiping, edge taps, and a thumbnail browser.
- PDF Document Management - Implements comprehensive tools for navigating PDF files, including swiping and thumbnail browsing.
- iOS UI Components - Ships as a reusable UI component for PDF display and state management on Apple platforms.
- PDF Viewers - Provides a native iOS UI component for rendering and interacting with PDF documents.
- PDF Framework Integration - Provides a framework for embedding high-performance PDF viewing into iOS applications.
- Off-Main-Thread Processing - Offloads PDF parsing and page generation to background threads to maintain UI responsiveness.
- Tiled Bitmap Rendering - Utilizes tiled bitmap rendering to maintain high frame rates during fast document scrolling.
- Document State Management - Tracks and persists user state such as current page and bookmarks across rendering cycles.
- PDF Link Resolution - Resolves internal page links and external web addresses embedded within documents.
- Session State Persistence - Persists the current page index and user bookmarks across sessions for recovery.
- App State Persistence - Saves and restores page numbers and bookmarks specifically for iOS device sessions.
- PDF Encryptions and Decryptions - Provides mechanisms to decrypt and unlock password-protected PDF streams for document display.
- Link-Based Navigation - Implements coordinate-based detection of internal and external links to trigger document navigation.
- Paging Navigation Systems - Supports document traversal through horizontal swipes and tap gestures for page cycling.
- Media Processing - PDF document reader with iBooks-like navigation and security.
- PDF Tools - Core library for PDF reading.
