Agent Skills
› fanfan-de/anybox
› building-native-ui
building-native-ui
GitHubExpo UI构建指南，涵盖Expo Router导航、原生组件、动画及样式。强调优先使用Expo Go进行开发测试，仅在必要时创建自定义原生构建。提供代码规范、文件命名约定及路由结构最佳实践，参考模块包括Reanimated、SQLite等。
Trigger Scenarios
询问如何搭建Expo应用界面
需要Expo Router导航配置建议
咨询Expo Go与自定义构建的区别
查找Expo原生UI组件用法
Install
npx skills add fanfan-de/anybox --skill building-native-ui -g -y
SKILL.md
Frontmatter
{
"name": "building-native-ui",
"license": "MIT",
"version": "1.0.1",
"description": "Complete guide for building beautiful apps with Expo Router. Covers fundamentals, styling, components, navigation, animations, patterns, and native tabs."
}
Expo UI Guidelines
References
Consult these resources as needed:
references/
animations.md Reanimated: entering, exiting, layout, scroll-driven, gestures
controls.md Native iOS: Switch, Slider, SegmentedControl, DateTimePicker, Picker
form-sheet.md Form sheets in expo-router: configuration, footers and background interaction.
gradients.md CSS gradients via experimental_backgroundImage (New Arch only)
icons.md SF Symbols via expo-image (sf: source), names, animations, weights
media.md Camera, audio, video, and file saving
route-structure.md Route conventions, dynamic routes, groups, folder organization
search.md Search bar with headers, useSearch hook, filtering patterns
storage.md SQLite, AsyncStorage, SecureStore
tabs.md NativeTabs, migration from JS tabs, iOS 26 features
toolbar-and-headers.md Stack headers and toolbar buttons, menus, search (iOS only)
visual-effects.md Blur (expo-blur) and liquid glass (expo-glass-effect)
webgpu-three.md 3D graphics, games, GPU visualizations with WebGPU and Three.js
zoom-transitions.md Apple Zoom: fluid zoom transitions with Link.AppleZoom (iOS 18+)
Running the App
CRITICAL: Always try Expo Go first before creating custom builds.
Most Expo apps work in Expo Go without any custom native code. Before running npx expo run:ios or npx expo run:android:
- Start with Expo Go: Run
npx expo startand scan the QR code with Expo Go - Check if features work: Test your app thoroughly in Expo Go
- Only create custom builds when required - see below
When Custom Builds Are Required
You need npx expo run:ios/android or eas build ONLY when using:
- Local Expo modules (custom native code in
modules/) - Apple targets (widgets, app clips, extensions via
@bacons/apple-targets) - Third-party native modules not included in Expo Go
- Custom native configuration that can't be expressed in
app.json
When Expo Go Works
Expo Go supports a huge range of features out of the box:
- All
expo-*packages (camera, location, notifications, etc.) - Expo Router navigation
- Most UI libraries (reanimated, gesture handler, etc.)
- Push notifications, deep links, and more
If you're unsure, try Expo Go first. Creating custom builds adds complexity, slower iteration, and requires Xcode/Android Studio setup.
Code Style
- Be cautious of unterminated strings. Ensure nested backticks are escaped; never forget to escape quotes correctly.
- Always use import statements at the top of the file.
- Always use kebab-case for file names, e.g.
comment-card.tsx - Always remove old route files when moving or restructuring navigation
- Never use special characters in file names
- Configure tsconfig.json with path aliases, and prefer aliases over relative imports for refactors.
Routes
See ./references/route-structure.md for detailed route conventions.
- Routes belong in the
appdirectory. - Never co-locate components, types, or utilities in the app directory. This is an anti-pattern.
- Ensure the app always has a route that matches "/", it may be inside a group route.
Library Preferences
- Never use modules removed from React Native such as Picker, WebView, SafeAreaView, or AsyncStorage
- Never use legacy expo-permissions
expo-audionotexpo-avexpo-videonotexpo-avexpo-imagewithsource="sf:name"for SF Symbols, notexpo-symbolsor@expo/vector-iconsreact-native-safe-area-contextnot react-native SafeAreaViewprocess.env.EXPO_OSnotPlatform.OSReact.usenotReact.useContextexpo-imageImage component instead of intrinsic elementimgexpo-glass-effectfor liquid glass backdrops
Responsiveness
- Always wrap root component in a scroll view for responsiveness
- Use
<ScrollView contentInsetAdjustmentBehavior="automatic" />instead of<SafeAreaView>for smarter safe area insets contentInsetAdjustmentBehavior="automatic"should be applied to FlatList and SectionList as well- Use flexbox instead of Dimensions API
- ALWAYS prefer
useWindowDimensionsoverDimensions.get()to measure screen size
Behavior
- Use expo-haptics conditionally on iOS to make more delightful experiences
- Use views with built-in haptics like
<Switch />from React Native and@react-native-community/datetimepicker - When a route belongs to a Stack, its first child should almost always be a ScrollView with
contentInsetAdjustmentBehavior="automatic"set - When adding a
ScrollViewto the page it should almost always be the first component inside the route component - Prefer
headerSearchBarOptionsin Stack.Screen options to add a search bar - Use the
<Text selectable />prop on text containing data that could be copied - Consider formatting large numbers like 1.4M or 38k
- Never use intrinsic elements like 'img' or 'div' unless in a webview or Expo DOM component
Styling
Follow Apple Human Interface Guidelines.
General Styling Rules
- Prefer flex gap over margin and padding styles
- Prefer padding over margin where possible
- Always account for safe area, either with stack headers, tabs, or ScrollView/FlatList
contentInsetAdjustmentBehavior="automatic" - Ensure both top and bottom safe area insets are accounted for
- Inline styles not StyleSheet.create unless reusing styles is faster
- Add entering and exiting animations for state changes
- Use
{ borderCurve: 'continuous' }for rounded corners unless creating a capsule shape - ALWAYS use a navigation stack title instead of a custom text element on the page
- When padding a ScrollView, use
contentContainerStylepadding and gap instead of padding on the ScrollView itself (reduces clipping) - CSS and Tailwind are not supported - use inline styles
Text Styling
- Add the
selectableprop to every<Text/>element displaying important data or error messages - Counters should use
{ fontVariant: 'tabular-nums' }for alignment
Shadows
Use CSS boxShadow style prop. NEVER use legacy React Native shadow or elevation styles.
<View style={{ boxShadow: "0 1px 2px rgba(0, 0, 0, 0.05)" }} />
'inset' shadows are supported.
Navigation
Link
Use <Link href="/path" /> from 'expo-router' for navigation between routes.
import { Link } from 'expo-router';
// Basic link
<Link href="/path" />
// Wrapping custom components
<Link href="/path" asChild>
<Pressable>...</Pressable>
</Link>
Whenever possible, include a <Link.Preview> to follow iOS conventions. Add context menus and previews frequently to enhance navigation.
Stack
- ALWAYS use
_layout.tsxfiles to define stacks - Use Stack from 'expo-router/stack' for native navigation stacks
Page Title
Set the page title in Stack.Screen options:
<Stack.Screen options={{ title: "Home" }} />
Context Menus
Add long press context menus to Link components:
import { Link } from "expo-router";
<Link href="/settings" asChild>
<Link.Trigger>
<Pressable>
<Card />
</Pressable>
</Link.Trigger>
<Link.Menu>
<Link.MenuAction
title="Share"
icon="square.and.arrow.up"
onPress={handleSharePress}
/>
<Link.MenuAction
title="Block"
icon="nosign"
destructive
onPress={handleBlockPress}
/>
<Link.Menu title="More" icon="ellipsis">
<Link.MenuAction title="Copy" icon="doc.on.doc" onPress={() => {}} />
<Link.MenuAction
title="Delete"
icon="trash"
destructive
onPress={() => {}}
/>
</Link.Menu>
</Link.Menu>
</Link>;
Link Previews
Use link previews frequently to enhance navigation:
<Link href="/settings">
<Link.Trigger>
<Pressable>
<Card />
</Pressable>
</Link.Trigger>
<Link.Preview />
</Link>
Link preview can be used with context menus.
Modal
Present a screen as a modal:
<Stack.Screen name="modal" options={{ presentation: "modal" }} />
Prefer this to building a custom modal component.
Sheet
Present a screen as a dynamic form sheet:
<Stack.Screen
name="sheet"
options={{
presentation: "formSheet",
sheetGrabberVisible: true,
sheetAllowedDetents: [0.5, 1.0],
contentStyle: { backgroundColor: "transparent" },
}}
/>
- Using
contentStyle: { backgroundColor: "transparent" }makes the background liquid glass on iOS 26+.
Common route structure
A standard app layout with tabs and stacks inside each tab:
app/
_layout.tsx — <NativeTabs />
(index,search)/
_layout.tsx — <Stack />
index.tsx — Main list
search.tsx — Search view
// app/_layout.tsx
import { NativeTabs, Icon, Label } from "expo-router/unstable-native-tabs";
import { Theme } from "../components/theme";
export default function Layout() {
return (
<Theme>
<NativeTabs>
<NativeTabs.Trigger name="(index)">
<Icon sf="list.dash" />
<Label>Items</Label>
</NativeTabs.Trigger>
<NativeTabs.Trigger name="(search)" role="search" />
</NativeTabs>
</Theme>
);
}
Create a shared group route so both tabs can push common screens:
// app/(index,search)/_layout.tsx
import { Stack } from "expo-router/stack";
import { PlatformColor } from "react-native";
export default function Layout({ segment }) {
const screen = segment.match(/\((.*)\)/)?.[1]!;
const titles: Record<string, string> = { index: "Items", search: "Search" };
return (
<Stack
screenOptions={{
headerTransparent: true,
headerShadowVisible: false,
headerLargeTitleShadowVisible: false,
headerLargeStyle: { backgroundColor: "transparent" },
headerTitleStyle: { color: PlatformColor("label") },
headerLargeTitle: true,
headerBlurEffect: "none",
headerBackButtonDisplayMode: "minimal",
}}
>
<Stack.Screen name={screen} options={{ title: titles[screen] }} />
<Stack.Screen name="i/[id]" options={{ headerLargeTitle: false }} />
</Stack>
);
}
Version History
- 08dc189 Current 2026-07-05 18:57
