Image

A SwiftUI Image component for displaying SF Symbols. Also called Icon (Universal).

Expo UI Image displays SF Symbols using the SwiftUI Image API. SF Symbols are a library of configurable symbols provided by Apple.

Usage

Basic SF Symbol

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

export default function BasicImageExample() {
  return (
    <Host style={{ flex: 1 }}>
      <Image systemName="star.fill" />
    </Host>
  );
}

Custom SF Symbol

Use the assetName prop to display a custom SF Symbol imported into the app asset catalog as a symbol set.

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

export default function CustomImageExample() {
  return (
    <Host matchContents>
      <Image assetName="acme.mark" />
    </Host>
  );
}

With size and color

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

export default function ImageSizeColorExample() {
  return (
    <Host style={{ flex: 1 }}>
      <HStack spacing={16}>
        <Image systemName="heart.fill" size={24} color="red" />
        <Image systemName="star.fill" size={32} color="orange" />
        <Image systemName="bell.fill" size={40} color="blue" />
      </HStack>
    </Host>
  );
}

With variable value

Some SF Symbols alter their appearance based on a variable value. Use the variableValue prop with a value between 0.0 and 1.0 to control the rendered symbol. Requires iOS 16.0+ and SF Symbols 4.0+.

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

export default function ImageVariableExample() {
  return (
    <Host style={{ flex: 1 }}>
      <HStack spacing={16}>
        <Image
          systemName="chart.bar.fill"
          size={32}
          variableValue={0.3}
        />
        <Image
          systemName="chart.bar.fill"
          size={32}
          variableValue={0.6}
        />
        <Image
          systemName="chart.bar.fill"
          size={32}
          variableValue={1.0}
        />
      </HStack>
    </Host>
  );
}

Apply an SF Symbol effect to animate the symbol by passing a symbolEffect modifier from @expo/ui/swift-ui/modifiers. This effect runs continuously by default. You can also pass value for a discrete trigger that fires once per change, or isActive for a boolean toggle that runs the effect while true. Requires iOS 17.0 and later.

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

export default function ImageSymbolEffectExample() {
  return (
    <Host style={{ flex: 1 }}>
      <Image
        systemName="wifi"
        size={48}
        color="blue"
        modifiers={[
          symbolEffect({
            effect: 'variableColor',
            fillStyle: 'iterative',
            playbackStyle: 'reversing',
          }),
        ]}
      />
    </Host>
  );
}

The following example uses value to play bounce on each button press. Write to state.value from a worklet (or via scheduleOnUI) to trigger the effect.

import {
  Button,
  Host,
  Image,
  useNativeState,
  VStack,
} from '@expo/ui/swift-ui';
import { symbolEffect } from '@expo/ui/swift-ui/modifiers';
import { scheduleOnUI } from 'react-native-worklets';

export default function ImageSymbolEffectValueExample() {
  const trigger = useNativeState(0);

  return (
    <Host style={{ flex: 1 }}>
      <VStack spacing={16}>
        <Image
          systemName="bell.fill"
          size={48}
          color="orange"
          modifiers={[
            symbolEffect(
              { effect: 'bounce', direction: 'up' },
              { value: trigger }
            ),
          ]}
        />
        <Button
          label="Bounce"
          onPress={() =>
            scheduleOnUI(() => {
              'worklet';
              trigger.value = trigger.value + 1;
            })
          }
        />
      </VStack>
    </Host>
  );
}

The following example uses isActive to toggle a continuous breathe animation.

import {
  Host,
  Image,
  SyncToggle,
  useNativeState,
  VStack,
} from '@expo/ui/swift-ui';
import { symbolEffect } from '@expo/ui/swift-ui/modifiers';

export default function ImageSymbolEffectIsActiveExample() {
  const isActive = useNativeState(true);

  return (
    <Host style={{ flex: 1 }}>
      <VStack spacing={16}>
        <Image
          systemName="cloud.fill"
          size={48}
          color="cyan"
          modifiers={[
            symbolEffect({ effect: 'breathe' }, { isActive }),
          ]}
        />
        <SyncToggle label="Breathe" isOn={isActive} />
      </VStack>
    </Host>
  );
}

API

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

Image (SwiftUI) (source-of-truth/versions/v57.0.0/sdk/ui/swift-ui/image.md)
Image (Universal) (source-of-truth/versions/v57.0.0/sdk/ui/universal/icon.md)

Usage

Basic SF Symbol

Custom SF Symbol

With size and color

With variable value

With symbol effect

API

Component

`Image`

`assetName`

`color`

`onPress`

`size`

`systemName`

`uiImage`

Modifiers

Modifiers for Image

Modifiers for any view

Sources

On this page