Expo Native UI

Build production-quality native mobile apps with Expo Router following Apple Human Interface Guidelines and modern React Native patterns.

Installation

OpenClaw / Moltbot / Clawbot

npx clawhub@latest install expo-native-ui

WHAT This Skill Does

Guides implementation of native mobile apps using Expo Router with:

• File-based routing with native navigation stacks
• Native tab bars (NativeTabs) and iOS 26 features
• SF Symbols integration via expo-symbols
• Blur effects (expo-blur) and liquid glass (expo-glass-effect)
• Reanimated animations and gesture handling
• Native controls: Switch, Slider, SegmentedControl, DateTimePicker

WHEN To Use

• Building a new Expo Router app
• Adding native tab navigation
• Implementing iOS-style blur or liquid glass effects
• Creating smooth animations with entering/exiting transitions
• Integrating SF Symbols for icons
• Setting up route structure with groups and dynamic routes

KEYWORDS

expo router, react native, native tabs, sf symbols, expo blur, liquid glass, reanimated, ios, android, mobile app, navigation stack, form sheet, modal, context menu, link preview

References

Consult these resources for detailed implementation:

Core Principles

Running the App

Try Expo Go first before creating custom builds:

npx expo start  # Scan QR with Expo Go

Custom builds (npx expo run:ios) only needed for:

• Local Expo modules (custom native code in modules/)
• Apple targets (widgets, app clips via @bacons/apple-targets)
• Third-party native modules not in Expo Go

Code Style

• Kebab-case file names: comment-card.tsx
• Path aliases in tsconfig over relative imports
• Never co-locate components/utilities in app/ directory
• Always ensure a route matches "/" (may be in a group)
• Escape nested backticks carefully in strings

Library Preferences

Responsiveness

// Always wrap root in ScrollView with automatic insets
\x3CScrollView contentInsetAdjustmentBehavior="automatic">
  {children}
\x3C/ScrollView>

// Use useWindowDimensions, not Dimensions.get()
const { width, height } = useWindowDimensions();

// Flexbox over Dimensions API
\x3CView style={{ flex: 1, flexDirection: 'row', gap: 16 }} />

Navigation Patterns

Link with Preview and Context Menu

import { Link } from 'expo-router';

\x3CLink href="/settings">
  \x3CLink.Trigger>
    \x3CPressable>\x3CCard />\x3C/Pressable>
  \x3C/Link.Trigger>
  \x3CLink.Preview />
  \x3CLink.Menu>
    \x3CLink.MenuAction title="Share" icon="square.and.arrow.up" onPress={handleShare} />
    \x3CLink.MenuAction title="Delete" icon="trash" destructive onPress={handleDelete} />
  \x3C/Link.Menu>
\x3C/Link>

Form Sheet Modal

// In _layout.tsx
\x3CStack.Screen
  name="sheet"
  options={{
    presentation: "formSheet",
    sheetGrabberVisible: true,
    sheetAllowedDetents: [0.5, 1.0],
    contentStyle: { backgroundColor: "transparent" }, // Liquid glass on iOS 26+
  }}
/>

Native Tabs Structure

app/
  _layout.tsx — \x3CNativeTabs />
  (index,search)/
    _layout.tsx — \x3CStack />
    index.tsx
    search.tsx

// app/_layout.tsx
import { NativeTabs, Icon, Label } from "expo-router/unstable-native-tabs";

export default function Layout() {
  return (
    \x3CNativeTabs>
      \x3CNativeTabs.Trigger name="(index)">
        \x3CIcon sf="list.dash" />
        \x3CLabel>Items\x3C/Label>
      \x3C/NativeTabs.Trigger>
      \x3CNativeTabs.Trigger name="(search)" role="search" />
    \x3C/NativeTabs>
  );
}

Styling Guidelines

• Flex gap over margin/padding where possible
• borderCurve: 'continuous' for rounded corners (not capsules)
• boxShadow style prop, never legacy RN shadow/elevation
• Stack title instead of custom text elements for page headers
• Inline styles, not StyleSheet.create unless reusing
• fontVariant: 'tabular-nums' for numeric counters
• selectable prop on Text displaying copiable data

// Shadow example
\x3CView style={{ boxShadow: "0 1px 2px rgba(0, 0, 0, 0.05)" }} />

// Continuous border curve
\x3CView style={{ borderRadius: 12, borderCurve: 'continuous' }} />

Behavior Patterns

• Haptics: Use expo-haptics conditionally on iOS
• Search bar: Prefer headerSearchBarOptions in Stack.Screen
• Selectable text: Add selectable prop to important data
• Format large numbers: 1.4M, 38k instead of 1,400,000
• Never use intrinsic elements (img, div) outside DOM components

NEVER Do

1. NEVER use legacy modules: Picker, WebView, SafeAreaView from react-native, AsyncStorage (old), expo-permissions
2. NEVER use Dimensions.get() — always useWindowDimensions
3. NEVER co-locate components in the app/ directory
4. NEVER use Platform.OS — use process.env.EXPO_OS
5. NEVER use legacy shadow styles — use CSS boxShadow
6. NEVER start with custom builds — try Expo Go first
7. NEVER use StyleSheet.create for one-time styles
8. NEVER use @expo/vector-icons — use expo-symbols