Architecture Overview

MeTuber is an iOS video streaming application with a clean, modular architecture. Here's the breakdown:

1. Core Components:

   • PlayerVC: Main video player view controller that handles video playback
   • VideosVC: Grid view controller for displaying video thumbnails
   • VideoCell: Custom cell for displaying individual video thumbnails
   • VideoPlayerOverlayView: Custom overlay view for video player controls

2. Data Management:

   • IVideoManager: Protocol defining video management interface
   • JsonVideoManager: Implementation that loads videos from JSON (lazy loading is implemented)
   • Video: Data model for video content
   • IDownloadManager: Protocol for handling downloads
   • DownloadManager: Implementation with serial download queue

3. Dependency Injection:

   • Uses a custom DIContainer for dependency management
   • Services are registered in AppDelegate

Key Design Patterns

1. Protocol-Oriented Programming:

   • Heavy use of protocols (IVideoManager, IDownloadManager) for abstraction
   • Enables easy swapping of implementations

2. MVVM-like Architecture:

   • View Controllers handle UI logic
   • Managers handle business logic
   • Clear separation of concerns

3. Observer Pattern:

   • Extensive use of KVO for player state management
   • Handles player status, rate, and item status changes

4. Factory Pattern:

   • WindowService for creating view controllers for the scene
   • DIContainer for service instantiation

UI/UX Design

1. Video Grid:

   • 3-column grid layout
   • Custom VideoCell with thumbnail and description
   • Smooth scrolling with cell reuse

2. Video Player:

   • Custom overlay with gradient background
   • Progress slider
   • Description display
   • Gesture-based navigation (swipe up/down)

3. Performance Optimizations:

   • Video preloading (3 videos ahead)
   • Serial download queue for thumbnails
   • Cell reuse in collection view

Technical Features

1. Video Playback:

   • Uses AVPlayerViewController for robust video playback
   • Custom buffering strategy (30-second pre-buffer)
   • State management for play/pause

2. Resource Management:

   • Efficient thumbnail loading
   • Memory management with weak references
   • Proper cleanup of observers

3. Navigation:

   • Custom navigation system
   • Scene-based window management
   • Smooth transitions between views

Current Issues

1. Dependency Injection Module:
   • There's a linter error indicating missing DependencyInjection module
   • This needs to be resolved for proper dependency management

Recommendations

1. Error Handling:

   • Add more robust error handling for network failures
   • Implement retry mechanisms for failed downloads

2. Caching:

   • Implement thumbnail caching
   • Add video caching for offline playback

3. Testing:

   • Add unit tests for managers
   • Implement UI tests for critical flows

4. Accessibility:

   • Add accessibility labels
   • Implement VoiceOver support