AVKit High-level media playback UI built on AVFoundation. Provides system-standard video players, Picture-in-Picture, AirPlay routing, transport controls, and subtitle/caption display. Targets Swift 6.3 / iOS 26+. Contents - Setup - AVPlayerViewController - SwiftUI VideoPlayer - Picture-in-Picture - AirPlay - Transport Controls and Playback Speed - Subtitles and Closed Captions - Common Mistakes - Review Checklist - References Setup Audio Session Configuration Playback apps need an audio session category and the matching background mode when they support background audio, AirPlay, or PiP. 1.…