What problem does it solve? Building React Native apps that feel truly native on iOS requires deep knowledge of Expo Router conventions, native controls, SF Symbols, and platform-specific behaviors that are easy to get wrong. ## Core Features & Use Cases - Navigation & Routing: Implement stacks, native tabs, form sheets, modals, link previews, and context menus using Expo Router file-based conventions. - Native UI Components: Use SF Symbols, native switches, sliders, segmented controls, date pickers, blur effects, and iOS 26 liquid glass for platform-authentic interfaces. - Animations & Media: Add Reanimated entering/exiting/scroll-driven animations, haptics, camera, audio/video playback, and local storage with SQLite or SecureStore. - Use Case: When building a new Expo app screen, apply these guidelines to structure routes correctly, style with Apple Human Interface Guidelines, and choose the right native components instead of deprecated libraries. ## Quick Start Use the building-native-ui skill to create an Expo Router app screen with native tabs, a stack header with search, and Reanimated list animations.