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SwiftUI

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SwiftUI components for building native iOS interfaces with @expo/ui.

iOS
tvOS
Bundled version:
~0.2.0-beta.4
This library is currently in beta and subject to breaking changes. It is not available in the Expo Go app — use development builds to try it out.

The SwiftUI components in @expo/ui/swift-ui allow you to build fully native iOS interfaces using SwiftUI from React Native.

Expo UI guide for Swift UI

Learn about the basics of @expo/ui/swift-ui

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.

Components

BottomSheet

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

const { width } = useWindowDimensions();

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

See also: official SwiftUI documentation

Button

The borderless variant is not available on Apple TV.
import { Button, Host } from '@expo/ui/swift-ui';

<Host style={{ flex: 1 }}>
  <Button
    variant="default"
    onPress={() => {
      setEditingProfile(true);
    }}>
    Edit profile
  </Button>
</Host>

See also: official SwiftUI documentation

CircularProgress

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

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

See also: official SwiftUI documentation

ColorPicker

This component is 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>

See also: official SwiftUI documentation

ContextMenu

Note: Also known as DropdownMenu.

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

<Host style={{ width: 150, height: 50 }}>
  <ContextMenu>
    <ContextMenu.Items>
      <Button
        systemImage="person.crop.circle.badge.xmark"
        onPress={() => console.log('Pressed1')}>
        Hello
      </Button>
      <Button
        variant="bordered"
        systemImage="heart"
        onPress={() => console.log('Pressed2')}>
        Love it
      </Button>
      <Picker
        label="Doggos"
        options={['very', 'veery', 'veeery', 'much']}
        variant="menu"
        selectedIndex={selectedIndex}
        onOptionSelected={({ nativeEvent: { index } }) => setSelectedIndex(index)}
      />
    </ContextMenu.Items>
    <ContextMenu.Trigger>
      <Button variant="bordered">
        Show Menu
      </Button>
    </ContextMenu.Trigger>
  </ContextMenu>
</Host>

See also: official SwiftUI documentation

DateTimePicker (date)

This component is not available on Apple TV.
import { DateTimePicker, Host } from '@expo/ui/swift-ui';

<Host matchContents>
  <DateTimePicker
    onDateSelected={date => {
      setSelectedDate(date);
    }}
    displayedComponents='date'
    initialDate={selectedDate.toISOString()}
    variant='wheel'
  />
</Host>

See also: official SwiftUI documentation

DateTimePicker (time)

This component is not available on Apple TV.
import { DateTimePicker, Host } from '@expo/ui/swift-ui';

<Host matchContents>
  <DateTimePicker
    onDateSelected={date => {
      setSelectedDate(date);
    }}
    displayedComponents='hourAndMinute'
    initialDate={selectedDate.toISOString()}
    variant='wheel'
  />
</Host>

See also: official SwiftUI documentation

Gauge

This component is not available on Apple TV.
import { Gauge, Host } from "@expo/ui/swift-ui";

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

See also: official SwiftUI documentation

Host

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.

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

function Example() {
  return (
    <Host matchContents>
      <Button
        onPress={() => {
          console.log('Pressed');
        }}>
        Click
      </Button>
    </Host>
  );
}
Host with flexbox and VStack
import { Button, Host, VStack, Text } from '@expo/ui/swift-ui';

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

LinearProgress

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

<Host style={{ width: 300 }}>
  <LinearProgress progress={0.5} color="red" />
</Host>

See also: official SwiftUI documentation

List

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

<Host style={{ flex: 1 }}>
  <List
    scrollEnabled={false}
    editModeEnabled={editModeEnabled}
    onSelectionChange={(items) => alert(`indexes of selected items: ${items.join(', ')}`)}
    moveEnabled={moveEnabled}
    onMoveItem={(from, to) => alert(`moved item at index ${from} to index ${to}`)}
    onDeleteItem={(item) => alert(`deleted item at index: ${item}`)}
    listStyle='automatic'
    deleteEnabled={deleteEnabled}
    selectEnabled={selectEnabled}>
    {data.map((item, index) => (
      <LabelPrimitive key={index} title={item.text} systemImage={item.systemImage} color={color} />
    ))}
  </List>
</Host>

See also: official SwiftUI documentation

Picker (segmented)

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

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

See also: official SwiftUI documentation

Picker (wheel)

The wheel variant is not available on Apple TV.
import { Host, Picker } from '@expo/ui/swift-ui';

<Host style={{ height: 100 }}>
  <Picker
    options={['$', '$$', '$$$', '$$$$']}
    selectedIndex={selectedIndex}
    onOptionSelected={({ nativeEvent: { index } }) => {
      setSelectedIndex(index);
    }}
    variant="wheel"
  />
</Host>

See also: official SwiftUI documentation

Slider

This component is not available on Apple TV.
import { Host, Slider } from '@expo/ui/swift-ui';

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

See also: official SwiftUI documentation

Switch (toggle)

Note: Also known as Toggle.

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

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

See also: official SwiftUI documentation

Switch (checkbox)

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

<Host matchContents>
  <Switch
    checked={checked}
    onValueChange={checked => {
      setChecked(checked);
    }}
    label="Play music"
    variant="checkbox"
  />
</Host>

See also: official SwiftUI documentation

TextField

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

<Host matchContents>
  <TextField autocorrection={false} defaultValue="A single line text input" onChangeText={setValue} />
</Host>

See also: official SwiftUI documentation

More

Expo UI is still in active development. We continue to add more functionality and may change the API. Some examples in the docs may not be up to date. If you want to see the latest changes, check the examples.

API

Full documentation is not yet available. Use TypeScript types to explore the API.

// Import from the SwiftUI package
import { BottomSheet } from '@expo/ui/swift-ui';