This is documentation for the next SDK version. For up-to-date documentation, see the latest version (SDK 57).

RNHostView

A cross-platform component for hosting React Native views inside @expo/ui views.

Android

iOS

Web

Included in Expo Go

GitHub

npm

Changelog

Recommended version:

~58.0.0

Hosts a React Native view subtree inside a universal @expo/ui layout. On Android and iOS, it re-exports the platform-native RNHostView for Jetpack Compose/RNHostView for SwiftUI, so React Native children bridge into the surrounding Compose/SwiftUI tree. On web, there is no native host tree to bridge into, so it falls back to a React Native View that wraps the children.

Note: Pass a single React Native element as the child. RNHostView measures and lays out only its first child, so wrap several views in one parent View and let that view arrange them.

A bold label above a purple React Native chip

Installation

Terminal

- npx expo install @expo/ui

- yarn expo install @expo/ui

- pnpm expo install @expo/ui

- bun expo install @expo/ui

If you are installing this in an existing React Native app, make sure to install expo in your project.

Usage

Basic usage

Place a React Native view subtree anywhere inside a universal @expo/ui layout.

RNHostViewExample.tsx

import { Host, Column, RNHostView, Text } from '@expo/ui';
import { Text as RNText, View, useColorScheme } from 'react-native';

export default function RNHostViewExample() {
  const colorScheme = useColorScheme();

  return (
    <Host matchContents>
      <Column spacing={12} style={{ padding: 16 }}>
        <Text
          textStyle={{ color: colorScheme === 'dark' ? '#FFFFFF' : '#000000', fontWeight: 'bold' }}>
          Native UI label
        </Text>
        <RNHostView matchContents>
          <View
            style={{
              alignSelf: 'flex-start',
              padding: 16,
              backgroundColor: '#9B59B6',
              borderRadius: 10,
            }}>
            <RNText style={{ color: 'white' }}>Plain React Native content</RNText>
          </View>
        </RNHostView>
      </Column>
    </Host>
  );
}

Fill parent vs. match child

By default RNHostView fills its native parent. Set matchContents to have it shrink to fit its React Native children instead.

RNHostViewSizingExample.tsx

import { Host, Column, Row, Text, RNHostView } from '@expo/ui';
import { View, useColorScheme } from 'react-native';

export default function RNHostViewSizingExample() {
  const colorScheme = useColorScheme();
  const ink = { color: colorScheme === 'dark' ? '#FFFFFF' : '#000000' };

  return (
    <Host matchContents>
      <Column spacing={24} style={{ padding: 16 }}>
        <Column spacing={8}>
          <Text textStyle={{ ...ink, fontSize: 18, fontWeight: 'bold' }}>Fill parent size</Text>
          <Text textStyle={{ fontSize: 12, color: '#666666' }}>
            The RNHostView fills the native parent's 100×100 frame.
          </Text>
          <Row style={{ width: 100, height: 100 }}>
            <RNHostView>
              <View style={{ flex: 1, backgroundColor: '#9B59B6', borderRadius: 10, margin: 4 }} />
            </RNHostView>
          </Row>
        </Column>

        <Column spacing={8}>
          <Text textStyle={{ ...ink, fontSize: 18, fontWeight: 'bold' }}>Match child size</Text>
          <Text textStyle={{ fontSize: 12, color: '#666666' }}>
            The RNHostView shrinks to wrap its 50×50 child.
          </Text>
          <Row style={{ padding: 8 }}>
            <RNHostView matchContents>
              <View
                style={{ width: 50, height: 50, backgroundColor: '#9B59B6', borderRadius: 10 }}
              />
            </RNHostView>
          </Row>
        </Column>
      </Column>
    </Host>
  );
}

API

import { RNHostView } from '@expo/ui';

Component

`RNHostView`

Android

iOS

Web

Type: React.Element<RNHostViewProps>

Hosts React Native views inside Jetpack Compose or SwiftUI views.

Props for the RNHostView component.

RNHostViewProps

`children`

Android

iOS

Web

Type: ReactElement

The React Native view to host.

`disabled`

Android

iOS

Web

Optional • Type: boolean

Whether the component is disabled. Disabled components do not respond to user interaction.

`hidden`

Android

iOS

Web

Optional • Type: boolean

Whether the component is hidden.

`matchContents`

Android

iOS

Optional • Type: boolean • Default: false

When true, the host updates its size in the native view tree to match the children's size. When false, the host uses the size of the parent native view.

Can only be set once on mount; changing it remounts the component.

`modifiers`

Android

iOS

Optional • Type: ModifierConfig[]

Platform-specific modifier escape hatch. Pass an array of modifier configs from @expo/ui/swift-ui/modifiers or @expo/ui/jetpack-compose/modifiers. A modifier supplied here replaces any modifier of the same type that the component derives from style or other props.

`onAppear`

Android

iOS

Web

Optional • Type: () => void

Called when the component appears on screen.

`onDisappear`

Android

iOS

Web

Optional • Type: () => void

Called when the component is removed from screen.

`onLayout`

Android

iOS

Web

Optional • Type: (event: LayoutChangeEvent) => void

`onPress`

Android

iOS

Web

Optional • Type: () => void

Called when the component is pressed.

`style`

Android

iOS

Web

Optional • Type:

Pick<ViewStyle, 'padding' | 'paddingHorizontal' | 'paddingVertical' | 'paddingTop' | 'paddingBottom' | 'paddingLeft' | 'paddingRight' | 'backgroundColor' | 'borderRadius' | 'borderWidth' | 'borderColor' | 'opacity' | 'width' | 'height'>

Platform-agnostic style properties. These are translated to SwiftUI modifiers on iOS and Jetpack Compose modifiers on Android.

`testID`

Android

iOS

Web

Optional • Type: string

Identifier used to locate the component in end-to-end tests.