This is documentation for the next SDK version. For up-to-date documentation, see the latest version (SDK 54).

Host

A SwiftUI Host component that enables SwiftUI components in React Native.

iOS

tvOS

A component that allows you to put the other @expo/ui/swift-ui components in React Native. It acts like <svg> for DOM, <Canvas> for react-native-skia, which underlying uses UIHostingController to render the SwiftUI views in UIKit.

Since the Host component is a React Native View, you can pass the style prop to it or matchContents prop to make the Host component match the contents' size.

Installation

Terminal

- npx expo install @expo/ui

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

Usage

Match contents sizing

Use matchContents to let the Host automatically size itself to fit its SwiftUI content, instead of requiring explicit dimensions.

MatchContentsExample.tsx

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

export default function MatchContentsExample() {
  return (
    <Host matchContents>
      <Button
        onPress={() => {
          console.log('Pressed');
        }}>
        Click
      </Button>
    </Host>
  );
}

Explicit sizing with style

Use style to set explicit sizes on the Host, such as filling the available space with flex: 1.

ExplicitSizingExample.tsx

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

export default function ExplicitSizingExample() {
  return (
    <Host style={{ flex: 1 }}>
      <VStack spacing={8}>
        <Text>Hello, world!</Text>
        <Button
          onPress={() => {
            console.log('Pressed');
          }}>
          Click
        </Button>
      </VStack>
    </Host>
  );
}

Ignoring keyboard safe area

Use ignoreSafeArea="keyboard" when React Native is already handling keyboard avoidance (for example, with react-native-keyboard-controller), to prevent the SwiftUI host from applying its own keyboard inset.

IgnoreKeyboardExample.tsx

import { Host, TextField } from '@expo/ui/swift-ui';
import { KeyboardProvider, KeyboardStickyView } from 'react-native-keyboard-controller';
import { View } from 'react-native';

export default function IgnoreKeyboardExample() {
  return (
    <KeyboardProvider>
      <View style={{ flex: 1, backgroundColor: 'black' }}>
        <KeyboardStickyView
          style={{
            position: 'absolute',
            bottom: 0,
            left: 0,
            right: 0,
            padding: 16,
            backgroundColor: 'green',
          }}>
          <Host matchContents ignoreSafeArea="keyboard" style={{ backgroundColor: 'red' }}>
            <TextField placeholder="Enter text" multiline />
          </Host>
        </KeyboardStickyView>
      </View>
    </KeyboardProvider>
  );
}

Ignoring all safe areas

Use ignoreSafeArea="all" when you want SwiftUI content to extend behind the status bar, useful for full-screen overlays or backgrounds.

IgnoreAllSafeAreasExample.tsx

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

export default function IgnoreAllSafeAreasExample() {
  return (
    <Host
      ignoreSafeArea="all"
      style={{ position: 'absolute', top: 0, left: 0, right: 0, bottom: 0 }}>
      <VStack>
        <Text>This content extends behind the status bar and home indicator.</Text>
      </VStack>
    </Host>
  );
}

API

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

No API data file found, sorry!