expo-ui（世博会用户界面）

Expo UI

Core Functionality

Expo UI brings native SwiftUI components to React Native, providing a 1-to-1 mapping to SwiftUI views for building modern iOS, macOS, and tvOS interfaces. Use Expo UI to leverage SwiftUI's declarative syntax and native performance while maintaining React Native's flexibility.

Available in SDK 54 and above.

When to Use

Use this skill when:

• Building native iOS interfaces with SwiftUI components from React Native
• Integrating SwiftUI primitives like Button, Form, List, TextField, Picker
• Creating layouts with HStack, VStack, and Spacer
• Applying SwiftUI modifiers for styling and behavior
• Working with glass morphism effects and advanced form controls (v10 preview)
• Implementing native tab navigation with Expo Router
• Mixing SwiftUI components with React Native views

Platform Support

Supported Platforms:

• iOS (primary platform)
• macOS
• tvOS

Requirements:

• SDK 54+
• Development builds (not available in Expo Go)
• iOS 26+ and Xcode 26+ for glassEffect modifier

Roadmap: Android (Jetpack Compose) and Web (DOM) support planned for future releases.

Version Notice

⚠️ Version Conflict: Official documentation is based on v9 (stable, ~0.2.0-beta.7). Local examples use v10 which may contain breaking changes. Always check TypeScript types for current API signatures. When using v10 preview features (marked with ⚠️), be aware that APIs may differ from v9 stable documentation.

Installation

Install the package in your Expo project:

npx expo install @expo/ui

For existing React Native apps, ensure expo is installed first.

Module Overview

Getting Started Module

• Focus: Installation, SDK requirements, platform support
• Key APIs: @expo/ui, @expo/ui/swift-ui, Host component
• Documentation: references/expo-ui-guide.md

Core Components Module

• Functionality: Basic SwiftUI primitives and Host container
• Key APIs: Host, Button, Text, Image, CircularProgress, LinearProgress
• Documentation: references/expo-ui-api-reference.md

Layouts Module

• Functionality: SwiftUI layout system and container components
• Key APIs: HStack, VStack, Form, Section, List, Spacer
• Documentation: references/expo-ui-guide.md, references/expo-ui-api-reference.md

Input Controls Module

• Functionality: User input and selection components
• Key APIs: Picker, Slider, Switch, TextField, ColorPicker, DateTimePicker
• Documentation: references/expo-ui-api-reference.md, references/expo-ui-v10-examples.md

Advanced Components Module

• Functionality: Specialized UI components
• Key APIs: BottomSheet, ContextMenu, Gauge, CircularProgress, LinearProgress
• Documentation: references/expo-ui-api-reference.md

Modifiers Module

• Functionality: SwiftUI modifier system for styling and behavior
• Key APIs: padding, frame, background, glassEffect, buttonStyle, controlSize
• Documentation: references/expo-ui-guide.md, references/expo-ui-v10-examples.md

v10 Preview Module

• Functionality: Preview features in v10 (may contain breaking changes)
• Key APIs: GlassEffectContainer, LabeledContent, DisclosureGroup, ContentUnavailableView
• Documentation: references/expo-ui-v10-examples.md

Interop Module

• Functionality: Integration between React Native and SwiftUI
• Key APIs: Host, UIHostingController, UIViewRepresentable
• Documentation: references/expo-ui-guide.md

Core Concepts

Host Component

The <Host> component bridges React Native (UIKit) and SwiftUI. Use UIHostingController to render SwiftUI views within React Native.

Key characteristics:

• Acts like <svg> in DOM or <Canvas> in react-native-skia
• Accepts style prop for flexbox layouts
• Use matchContents prop to size to children
• Required to enter SwiftUI context

Basic usage:

import { CircularProgress, Host } from '@expo/ui/swift-ui';

<Host matchContents>
  <CircularProgress />
</Host>

With flexbox layout:

<Host style={{ flex: 1, margin: 32 }}>
  <VStack spacing={32}>
    <Text>Hello, world!</Text>
    <Button onPress={handlePress}>Click</Button>
  </VStack>
</Host>

Layout System

SwiftUI uses a different layout system than React Native's flexbox. Use these components for layouts:

HStack and VStack:

• Arrange children horizontally or vertically
• Use spacing prop for consistent gaps
• Supports nesting for complex layouts

import { HStack, VStack, Spacer } from '@expo/ui/swift-ui';

<VStack spacing={16}>
  <HStack spacing={8}>
    <Text>Label</Text>
    <Spacer />
    <Switch value={enabled} onValueChange={setEnabled} />
  </HStack>
</VStack>

Form and Section:

• Group related controls together
• Automatically styled for iOS Settings appearance
• Use <Section> to create grouped content

<Form>
  <Section>
    <Text>Settings</Text>
    <Switch label="Airplane Mode" value={mode} onValueChange={setMode} />
  </Section>
</Form>

Important: Flexbox styles only work on <Host> component, not inside SwiftUI context. Use HStack/VStack for layouts once inside SwiftUI.

Modifiers System

SwiftUI modifiers customize appearance and behavior. Import from @expo/ui/swift-ui/modifiers and apply via modifiers prop.

import { Text, Host } from '@expo/ui/swift-ui';
import { padding, frame, background } from '@expo/ui/swift-ui/modifiers';

<Text
  size={32}
  modifiers={[
    padding({ all: 16 }),
    frame({ width: 200, height: 100 }),
    background('#007aff')
  ]}>
  Styled Text
</Text>

Common modifiers:

• padding() - Add insets around content
• frame() - Set explicit dimensions
• background() - Set background color or content
• clipShape() - Clip to shapes (roundedRectangle, circle, etc.)

Components

Basic Components

Button

Platform: iOS, tvOS (borderless variant not available on Apple TV)

import { Button, Host } from '@expo/ui/swift-ui';

<Host style={{ flex: 1 }}>
  <Button variant="default" onPress={handlePress}>
    Edit profile
  </Button>
</Host>

Props:

• onPress?: () => void - Callback when button is pressed
• systemImage?: SFSymbol - SF Symbol name (only used if children is a string)
• role?: 'default' | 'cancel' | 'destructive' - Button role (iOS only)
• controlSize?: 'mini' | 'small' | 'regular' | 'large' | 'extraLarge' - Control size
• variant?: ButtonVariant - Button style variant
• children?: string | React.ReactNode - Button content
• color?: string - Button color
• disabled?: boolean - Disabled state

Variants: default, bordered, borderless, borderedProminent, plain, glass, glassProminent, accessoryBar, accessoryBarAction, card, link

Text

Platform: iOS, macOS, tvOS

import { Text, Host } from '@expo/ui/swift-ui';

<Host>
  <Text size={24} weight="bold" color="primary">
    Hello, world!
  </Text>
</Host>

Props:

• children: string - Text content (must be a string, not React.ReactNode)
• size?: number - Font size
• weight?: 'ultraLight' | 'thin' | 'light' | 'regular' | 'medium' | 'semibold' | 'bold' | 'heavy' | 'black' - Font weight
• design?: 'default' | 'rounded' | 'serif' | 'monospaced' - Font design
• lineLimit?: number - Maximum number of lines
• color?: string - Text color

Important: Text children must be a string. Use individual size and weight props instead of a font object.

Image

import { Image, Host } from '@expo/ui/swift-ui';

<Host>
  <Image
    systemName="airplane"
    color="white"
    size={18}
    modifiers={[
      frame({ width: 28, height: 28 }),
      background('#ffa500'),
      clipShape('roundedRectangle')
    ]}
  />
</Host>

CircularProgress and LinearProgress

import { CircularProgress, LinearProgress, Host } from '@expo/ui/swift-ui';

<Host style={{ width: 300 }}>
  <CircularProgress progress={0.5} color="blue" />
  <LinearProgress progress={0.7} color="orange" />
</Host>

Form Controls

Switch (Toggle)

Platform: iOS, tvOS

import { Switch, Host } from '@expo/ui/swift-ui';

<Host matchContents>
  <Switch
    checked={checked}
    onValueChange={setChecked}
    label="Play music"
    variant="switch"
    color="#ff0000"
  />
</Host>

Variants: switch (toggle), checkbox

TextField

Platform: iOS, tvOS

import { TextField, Host } from '@expo/ui/swift-ui';

<Host matchContents>
  <TextField
    autocorrection={false}
    defaultValue="Enter text"
    onChangeText={setValue}
  />
</Host>

Picker

Platform: iOS (wheel not available on Apple TV)

import { Picker, Host } from '@expo/ui/swift-ui';

<Host matchContents>
  <Picker
    options={['$', '$$', '$$$', '$$$$']}
    selectedIndex={selectedIndex}
    onOptionSelected={({ nativeEvent: { index } }) => setSelectedIndex(index)}
    variant="segmented"
  />
</Host>

Variants: segmented, wheel, menu

Slider

Platform: iOS (not available on Apple TV)

import { Slider, Host } from '@expo/ui/swift-ui';

<Host style={{ minHeight: 60 }}>
  <Slider value={value} onValueChange={setValue} />
</Host>

ColorPicker

Platform: iOS (not available on Apple TV)

import { ColorPicker, Host } from '@expo/ui/swift-ui';

<Host style={{ width: 400, height: 200 }}>
  <ColorPicker
    label="Select a color"
    selection={color}
    onValueChanged={setColor}
  />
</Host>

DateTimePicker

Platform: iOS (not available on Apple TV)

import { DateTimePicker, Host } from '@expo/ui/swift-ui';

<Host matchContents>
  <DateTimePicker
    onDateSelected={setDate}
    displayedComponents="date"
    initialDate={date.toISOString()}
    variant="wheel"
  />
</Host>

Components: date (default) or hourAndMinute for time

Advanced Components

BottomSheet

Platform: iOS

import { BottomSheet, Host, Text } from '@expo/ui/swift-ui';

<Host style={{ position: 'absolute', width }}>
  <BottomSheet isOpened={isOpened} onIsOpenedChange={setIsOpened}>
    <Text>Hello, world!</Text>
  </BottomSheet>
</Host>

ContextMenu

Platform: iOS, tvOS

Also known as DropdownMenu

import { ContextMenu, Button, Picker, Host } from '@expo/ui/swift-ui';

<Host style={{ width: 150, height: 50 }}>
  <ContextMenu>
    <ContextMenu.Items>
      <Button systemImage="person.crop.circle" onPress={handleAction}>
        Hello
      </Button>
      <Picker label="Options" options={options} variant="menu" />
    </ContextMenu.Items>
    <ContextMenu.Trigger>
      <Button variant="bordered">Show Menu</Button>
    </ContextMenu.Trigger>
  </ContextMenu>
</Host>

Gauge

Platform: iOS (not available on Apple TV)

import { Gauge, Host, PlatformColor } from '@expo/ui/swift-ui';

<Host matchContents>
  <Gauge
    min={{ value: 0, label: '0' }}
    max={{ value: 1, label: '1' }}
    current={{ value: 0.5 }}
    color={[
      PlatformColor('systemRed'),
      PlatformColor('systemYellow'),
      PlatformColor('systemGreen')
    ]}
    type="circularCapacity"
  />
</Host>

List

Platform: iOS, tvOS

import { List, LabelPrimitive, Host } from '@expo/ui/swift-ui';

<Host style={{ flex: 1 }}>
  <List
    editModeEnabled={editMode}
    onSelectionChange={(items) => alert(`Selected: ${items.join(', ')}`)}
    moveEnabled={canMove}
    onMoveItem={(from, to) => alert(`Moved ${from} to ${to}`)}
    onDeleteItem={(index) => alert(`Deleted ${index}`)}
    listStyle="automatic"
  >
    {data.map((item, index) => (
      <LabelPrimitive
        key={index}
        title={item.text}
        systemImage={item.systemImage}
      />
    ))}
  </List>
</Host>

Features: Edit mode, move, delete, selection

Modifiers

Common Modifiers

Import from @expo/ui/swift-ui/modifiers:

import { padding, frame, background, clipShape } from '@expo/ui/swift-ui/modifiers';

Layout modifiers:

• padding({all, horizontal, vertical, top, bottom, leading, trailing}) - Add spacing
• frame({width, height, minWidth, maxWidth, minHeight, maxHeight}) - Set dimensions
• fixedSize() - Prevent automatic sizing

Styling modifiers:

• background(color or content) - Set background
• foregroundStyle(color) - Set foreground color
• clipShape(shape) - Clip to shape (roundedRectangle, circle, capsule)
• cornerRadius(radius) - Round corners
• font({size, weight, design}) - Font styling (Note: Text component uses individual props: size, weight, design)

Behavior modifiers:

• disabled(bool) - Enable/disable interaction
• animation(Animation.spring(), condition) - Animate changes

Glass Morphism Modifiers

⚠️ v10 Preview: glassEffect requires Xcode 26+ and iOS 26+. May differ from v9 APIs.

import { glassEffect, glassEffectId, animation, Animation } from '@expo/ui/swift-ui/modifiers';

<Text
  size={16}
  weight="medium"
  modifiers={[
    padding({ all: 16 }),
    glassEffect({
      glass: { variant: 'clear' }
    })
  ]}>
  Glass effect text
</Text>

Advanced glass effects with namespace:

import { Namespace } from '@expo/ui/swift-ui';

const namespaceId = useId();

<Namespace id={namespaceId}>
  <Image
    systemName="paintbrush.fill"
    modifiers={[
      glassEffect({ glass: { variant: 'clear' } }),
      glassEffectId('uniqueId', namespaceId),
      animation(Animation.spring({ duration: 0.8 }), isExpanded)
    ]}
  />
</Namespace>

v10 Preview Modifiers ⚠️

⚠️ v10 Preview: These modifiers may have different APIs in v9 stable. Check TypeScript types.

Button style modifiers:

• buttonStyle('glass' | 'glassProminent' | 'bordered' | 'borderless' | 'borderedProminent' | 'plain')
• controlSize('mini' | 'small' | 'regular' | 'large' | 'extraLarge')
• labelStyle('iconOnly' | 'titleAndIcon' | 'titleOnly')

<Button
  modifiers={[
    buttonStyle('glass'),
    controlSize('large')
  ]}>
  Glass Button
</Button>

Form control modifiers:

• pickerStyle('menu' | 'segmented' | 'wheel')
• tag(value) - Tag picker options for selection
• font({size}) - Font customization

<Picker
  modifiers={[pickerStyle('menu')]}
  selection={selectedIndex}
  onSelectionChange={setSelectedIndex}>
  {options.map((option, index) => (
    <Text key={index} modifiers={[tag(index)]}>
      {option}
    </Text>
  ))}
</Picker>

v10 Preview Features ⚠️

⚠️ v10 Preview: The following components and features are from v10 and may contain breaking changes from v9 stable APIs. Always check TypeScript types for current signatures.

GlassEffectContainer

Platform: iOS/macOS

Container component for glass morphism effects with coordinated animations.

import { GlassEffectContainer, Namespace } from '@expo/ui/swift-ui';

const namespaceId = useId();

<Host style={{ flex: 1 }}>
  <Namespace id={namespaceId}>
    <GlassEffectContainer
      spacing={30}
      modifiers={[
        padding({ all: 30 }),
        cornerRadius(20)
      ]}>
      <VStack spacing={25}>
        <Text>Glass content</Text>
      </VStack>
    </GlassEffectContainer>
  </Namespace>
</Host>

LabeledContent

Wrapper for labeled form elements with multi-part label support.

import { LabeledContent } from '@expo/ui/swift-ui';

<LabeledContent label="Name">
  <Text>John Doe</Text>
</LabeledContent>

<LabeledContent
  label={
    <>
      <Text>Title</Text>
      <Text>Subtitle</Text>
    </>
  }>
  <Text>Value</Text>
</LabeledContent>

DisclosureGroup

Expandable/collapsible content sections.

import { DisclosureGroup } from '@expo/ui/swift-ui';

<DisclosureGroup
  isExpanded={isExpanded}
  onStateChange={setIsExpanded}
  label="Show Details">
  <Text>Detailed content here</Text>
</DisclosureGroup>

ContentUnavailableView

Empty state or placeholder view with icon, title, and description.

import { ContentUnavailableView } from '@expo/ui/swift-ui';

<ContentUnavailableView
  title="No items"
  systemImage="tray"
  description="Add items to get started."
/>

Enhanced Button Styles (v10)

import { buttonStyle, controlSize, fixedSize } from '@expo/ui/swift-ui/modifiers';

<Button
  label="Glass"
  modifiers={[
    buttonStyle('glass'),
    controlSize('large'),
    fixedSize()
  ]}
/>

<Button
  label="Glass Prominent"
  modifiers={[
    buttonStyle('glassProminent'),
    controlSize('extraLarge')
  ]}
/>

Enhanced Form Features (v10)

ColorPicker with opacity:

<ColorPicker
  label="Select color"
  selection={color}
  supportsOpacity
  onValueChanged={setColor}
/>

Picker with menu style and tags:

import { pickerStyle, tag } from '@expo/ui/swift-ui/modifiers';

<Picker
  label="Menu Picker"
  modifiers={[pickerStyle('menu')]}
  selection={selectedIndex}
  onSelectionChange={setSelectedIndex}>
  {options.map((option, index) => (
    <Text key={index} modifiers={[tag(index)]}>
      {option}
    </Text>
  ))}
</Picker>

Interop with React Native

Using React Native Components in SwiftUI

React Native components can be nested inside Expo UI components. Expo UI automatically creates a UIViewRepresentable wrapper.

import { Text, Host, VStack } from '@expo/ui/swift-ui';
import { View } from 'react-native';

<Host>
  <VStack spacing={8}>
    <Text>SwiftUI Text</Text>
    <View style={{ width: 100, height: 100, backgroundColor: 'blue' }} />
  </VStack>
</Host>

Important limitations:

• SwiftUI controls layout properties (center, bounds, frame, transform) - don't set these directly on React Native views
• Once React Native components are rendered, the SwiftUI context is left
• Add a new <Host> wrapper to return to Expo UI components
• Best practice: Keep SwiftUI layouts self-contained with clear boundaries

Platform-Specific Notes

iOS-only components:

• BottomSheet
• ColorPicker
• DateTimePicker (wheel variant)
• Gauge
• Slider
• Glass effects (iOS 26+, Xcode 26+)

Apple TV exclusions:

• Button borderless variant
• ColorPicker
• DateTimePicker
• Gauge
• Slider

Common patterns:

• Use Platform.OS checks for platform-specific code
• Provide fallbacks for unsupported platforms
• Test on tvOS for tvOS-specific behaviors (focus, remote control)

Native Tabs with Expo Router

Native tabs provide platform-native tab navigation using system tab bars. Unlike JavaScript tabs, native tabs follow platform conventions and offer native performance.

Native tabs is experimental (SDK 54+, API subject to change). For fully custom designs, consider JavaScript tabs instead.

When to Use Native Tabs

Choose native tabs for:

• Platform-native navigation feel (iOS UITabBarController, Android Material Tabs)
• Native performance and system integration
• Platform-specific features (iOS 26+ liquid glass effects, minimize behavior)
• Standard tab patterns without extensive customization

Choose JavaScript/custom tabs for:

• Complete visual control over tab bar appearance
• Complex animations or custom layouts
• Consistent cross-platform appearance

Installation

Ensure expo-router is installed and configured:

npx expo install expo-router

app.json configuration:

{
  "expo": {
    "plugins": ["expo-router"]
  }
}

Basic Usage

Create a tab layout using file-based routing:

File structure:

app/
├── _layout.tsx
├── index.tsx
└── settings.tsx

app/_layout.tsx:

import { NativeTabs, Icon, Label } from 'expo-router/unstable-native-tabs';

export default function TabLayout() {
  return (
    <NativeTabs>
      <NativeTabs.Trigger name="index">
        <Label>Home</Label>
        <Icon sf="house.fill" drawable="ic_home" />
      </NativeTabs.Trigger>
      <NativeTabs.Trigger name="settings">
        <Icon sf="gear" drawable="ic_settings" />
        <Label>Settings</Label>
      </NativeTabs.Trigger>
    </NativeTabs>
  );
}

Tabs are not automatically added. Explicitly define each tab with NativeTabs.Trigger.

Customize Tab Items

Icons:

SF Symbols (iOS):

<Icon sf={{ default: 'house', selected: 'house.fill' }} />

Android drawables:

<Icon drawable="ic_home" />

Custom images:

<Icon src={require('./assets/home.png')} />
<Icon src={{
  default: require('./assets/home.png'),
  selected: require('./assets/home-active.png')
}} />

Labels:

<Label>Home</Label>           // Show label
<Label hidden />               // Hide label

Badges:

<Badge>9+</Badge>              // Text badge
<Badge />                      // Dot badge (no text)

Tab Bar Styling

Global styling:

<NativeTabs
  backgroundColor="white"
  iconColor="blue"
  tintColor="purple"
  blurEffect="systemMaterial"
  labelStyle={{ fontSize: 12, fontWeight: '600' }}
  labelVisibilityMode="auto"
  minimizeBehavior="automatic"
>

Per-tab styling:

<NativeTabs.Trigger name="page">
  <NativeTabs.Trigger.TabBar
    backgroundColor="white"
    iconColor="red"
  />
  <Label>Page</Label>
</NativeTabs.Trigger>

Key props:

• backgroundColor: Tab bar background color
• iconColor: Default icon color
• tintColor: Selected icon color
• blurEffect: iOS blur effect ('systemMaterial', 'extraLight', 'dark', etc.)
• labelStyle: Typography settings
• labelVisibilityMode: Android label visibility ('auto' | 'selected' | 'labeled' | 'unlabeled')
• minimizeBehavior: iOS 26+ minimize behavior ('automatic' | 'never' | 'onScrollDown' | 'onScrollUp')
• backBehavior: Android back button behavior ('history' | 'none' | 'initialRoute')

Advanced Features

Hide tabs conditionally:

const shouldHideMessagesTab = true;

<NativeTabs.Trigger name="messages" hidden={shouldHideMessagesTab} />

Hidden tabs cannot be navigated to in any way.

Disable pop to top (iOS):

<NativeTabs.Trigger name="index" disablePopToTop>
  <Label>Home</Label>
</NativeTabs.Trigger>

Disable scroll to top (iOS):

<NativeTabs.Trigger name="index" disableScrollToTop>
  <Label>Home</Label>
</NativeTabs.Trigger>

iOS 26+ search tab:

<NativeTabs.Trigger name="search" role="search">
  <Label>Search</Label>
</NativeTabs.Trigger>

iOS 26+ tab bar minimize:

<NativeTabs minimizeBehavior="onScrollDown">
  <NativeTabs.Trigger name="index">
    <Label>Home</Label>
  </NativeTabs.Trigger>
</NativeTabs>

Vector icons integration:

import MaterialIcons from '@expo/vector-icons/MaterialIcons';
import { VectorIcon } from 'expo-router/unstable-native-tabs';
import { Platform } from 'react-native';

<NativeTabs.Trigger name="index">
  <Label>Home</Label>
  {Platform.select({
    ios: <Icon sf="house.fill" />,
    android: <Icon src={<VectorIcon family={MaterialIcons} name="home" />} />,
  })}
</NativeTabs.Trigger>

Platform-Specific Considerations

Android:

• Limit of 5 tabs (Material Design constraint)
• Uses Material Tabs component
• Supports ripple effects and indicators

iOS:

• No tab limit (5 recommended for UX)
• Uses UITabBarController
• Supports blur effects and liquid glass (iOS 26+)
• Separate search tab support (iOS 26+)
• Role-based system tabs (search, bookmarks, contacts, etc.)

tvOS:

• Follows tvOS platform conventions
• Different tab bar positioning

Known limitations:

• No nested native tabs (can nest JavaScript tabs inside native tabs)
• Limited FlatList support for scroll-to-top and minimize-on-scroll
• Cannot measure tab bar height (varies by device: iPad, Vision Pro, etc.)
• For FlatList scroll edge issues, use disableTransparentOnScrollEdge prop

Migration from JavaScript Tabs

Key differences:

Before (JavaScript tabs):

<Tabs.Screen
  name="home"
  options={{
    tabBarIcon: ({ focused, color, size }) => (
      <Icon name="home" color={color} size={size} />
    ),
  }}
/>

After (Native tabs):

<NativeTabs.Trigger name="home">
  <Icon sf="house.fill" />
  <Label>Home</Label>
</NativeTabs.Trigger>

Use Stacks inside tabs:

Native tabs don't have mock headers. Nest Stack layouts:

// app/home/_layout.tsx
import { Stack } from 'expo-router';

export default function HomeLayout() {
  return (
    <Stack>
      <Stack.Screen name="index" options={{ title: 'Home' }} />
      <Stack.Screen name="details" options={{ title: 'Details' }} />
    </Stack>
  );
}

Common Workflows

Conditional tabs based on auth:

const { user } = useAuth();

return (
  <NativeTabs>
    <NativeTabs.Trigger name="index">
      <Label>Home</Label>
    </NativeTabs.Trigger>
    {user && (
      <NativeTabs.Trigger name="profile">
        <Label>Profile</Label>
      </NativeTabs.Trigger>
    )}
  </NativeTabs>
);

Badge updates:

const [unreadCount, setUnreadCount] = useState(0);

<NativeTabs.Trigger name="messages">
  {unreadCount > 0 && (
    <Badge>{unreadCount > 99 ? '99+' : unreadCount}</Badge>
  )}
  <Label>Messages</Label>
</NativeTabs.Trigger>

Common Workflows

Build an iOS Settings Interface

import {
  Form,
  Section,
  HStack,
  VStack,
  Button,
  Switch,
  Text,
  Image,
  Spacer,
  Host
} from '@expo/ui/swift-ui';
import { background, clipShape, frame } from '@expo/ui/swift-ui/modifiers';

function SettingsView() {
  const [airplaneMode, setAirplaneMode] = useState(true);

  return (
    <Host style={{ flex: 1 }}>
      <Form>
        <Section>
          <HStack spacing={8}>
            <Image
              systemName="airplane"
              color="white"
              size={18}
              modifiers={[
                frame({ width: 28, height: 28 }),
                background('#ffa500'),
                clipShape('roundedRectangle')
              ]}
            />
            <Text>Airplane Mode</Text>
            <Spacer />
            <Switch value={airplaneMode} onValueChange={setAirplaneMode} />
          </HStack>
        </Section>
      </Form>
    </Host>
  );
}

Create a Progress View

import { CircularProgress, LinearProgress, VStack, Host } from '@expo/ui/swift-ui';

function ProgressView() {
  return (
    <Host style={{ flex: 1, margin: 32 }}>
      <VStack spacing={32}>
        <CircularProgress progress={0.5} color="blue" />
        <LinearProgress progress={0.7} color="orange" />
      </VStack>
    </Host>
  );
}

Build a Form with Validation

import {
  Form,
  Section,
  TextField,
  Switch,
  Picker,
  Button,
  Host
} from '@expo/ui/swift-ui';

function FormView() {
  const [name, setName] = useState('');
  const [enabled, setEnabled] = useState(true);
  const [category, setCategory] = useState(0);

  return (
    <Host style={{ flex: 1 }}>
      <Form>
        <Section header="User Information">
          <TextField
            label="Name"
            defaultValue={name}
            onChangeText={setName}
          />
          <Switch
            label="Enabled"
            value={enabled}
            onValueChange={setEnabled}
          />
          <Picker
            label="Category"
            options={['General', 'Advanced', 'Expert']}
            selectedIndex={category}
            onOptionSelected={({ nativeEvent: { index } }) => setCategory(index)}
            variant="segmented"
          />
        </Section>
      </Form>
    </Host>
  );
}

Resource References

For detailed API specifications, code examples, and implementation guides, refer to:

• Installation and usage guide: references/expo-ui-guide.md

- Detailed installation steps - Host component explanation - Layout system (HStack, VStack) - Modifiers system - Common questions and FAQs

• Complete API reference: references/expo-ui-api-reference.md

- All components with examples - Platform support details - Props and events documentation - Code snippets for each component

• v10 preview features: references/expo-ui-v10-examples.md

- Glass morphism effects (GlassEffectContainer, glassEffect) - New button styles (glass, glassProminent) - Enhanced form components (LabeledContent, DisclosureGroup) - Breaking change warnings for v10

• Native tabs guide: references/native-tabs-guide.md

- Native tabs installation and setup - Platform-specific behaviors (iOS, Android, tvOS) - Advanced features (iOS 26+ search, minimize behavior) - Migration from JavaScript tabs - Common patterns and workflows

• Native tabs API reference: references/native-tabs-api.md

- Complete component API (NativeTabs, Icon, Label, Badge) - Props and types documentation - Platform-specific props - Vector icons integration - Known limitations and workarounds

Best Practices

1. Use Host boundaries wisely - Wrap SwiftUI content in <Host> and keep SwiftUI layouts self-contained
2. Prefer v9 stable APIs - Use documented v9 APIs unless v10 features are specifically needed
3. Check platform support - Some components are iOS-only, provide fallbacks for tvOS
4. Leverage TypeScript - Always check TypeScript types for accurate API signatures, especially for v10
5. Use modifiers for styling - Apply modifiers via the modifiers prop rather than inline styles
6. Test on real devices - Some features (like glass effects) require specific iOS/Xcode versions
7. Mind the layout transition - Remember that flexbox stops working inside SwiftUI context
8. Keep interop boundaries clear - Minimize mixing React Native and SwiftUI for better performance