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图标
平台原生图标——iOS 上的 SF 符号,Android 上的 Material 符号。
平台原生图标。在 Android 上,它渲染为 Material Symbol XML 矢量可绘制对象(推荐来源:@expo/material-symbols)。在 iOS 上,它渲染为 SF Symbol。
🌐 A platform-native icon. On Android, it renders a Material Symbol XML vector drawable (recommended source: @expo/material-symbols). On iOS, it renders an SF Symbol.
注意:
Icon在网页上无法显示。
安装
🌐 Installation
- npx expo install @expo/uiIf you are installing this in an existing React Native app, make sure to install expo in your project.
可选择安装 @expo/material-symbols 以在 Android 上使用打包图标。若需不同风格或自定义坐标轴,请参阅 Jetpack Compose 图标页面上的自定义样式 — 无需安装。
🌐 Optionally, install @expo/material-symbols to use the bundled icons on Android. For a different style or custom axes, see Custom styles on the Jetpack Compose Icon page — no install needed.
- npx expo install @expo/material-symbols用法
🌐 Usage
带有 Icon.select 的跨平台图标
🌐 Cross-platform icon with Icon.select
Icon.select 为当前平台选择正确的资源。将它与 @expo/ui/babel-plugin(由 babel-preset-expo 自动加载)配对,这样 Metro 就可以按平台对未使用的部分进行 tree-shake。
import { Host, Icon } from '@expo/ui'; export default function IconSelectExample() { return ( <Host matchContents> <Icon name={Icon.select({ ios: 'star.fill', android: import('@expo/material-symbols/star.xml'), })} size={32} color="orange" /> </Host> ); }
提升了 Icon.select
🌐 Hoisted Icon.select
在多个调用点重复使用同一个图标时,提升 Icon.select 调用。
🌐 Hoist the Icon.select call when reusing the same icon across multiple call sites.
import { Host, Row, Icon } from '@expo/ui'; const STAR = Icon.select({ ios: 'star.fill', android: import('@expo/material-symbols/star.xml'), }); export default function HoistedIconExample() { return ( <Host matchContents> <Row spacing={4}> <Icon name={STAR} size={20} color="gold" /> <Icon name={STAR} size={20} color="gold" /> <Icon name={STAR} size={20} color="gold" /> </Row> </Host> ); }
特定平台的文件
🌐 Platform-specific files
在 .android.tsx 文件中,直接导入 XML 资源。在 .ios.tsx 文件中,将 SF Symbol 名称作为字符串传递。
🌐 Inside an .android.tsx file, import the XML asset directly. Inside an .ios.tsx file, pass the SF Symbol name as a string.
import StarIcon from '@expo/material-symbols/star.xml'; import { Host, Icon } from '@expo/ui'; export default function StarRow() { return ( <Host matchContents> <Icon name={StarIcon} size={24} /> </Host> ); }
import { Host, Icon } from '@expo/ui'; export default function StarRow() { return ( <Host matchContents> <Icon name="star.fill" size={24} /> </Host> ); }
应用接口
🌐 API
import { Icon } from '@expo/ui';
Component
Type: React.Element<IconProps>
A platform-native icon. Renders an XML vector drawable (typically from
@expo/material-symbols) on Android and an SF Symbol on iOS.
Example
const STAR = Icon.select({ ios: 'star.fill', android: import('@expo/material-symbols/star.xml'), }); <Icon name={STAR} size={24} color="orange" />
Example
<Icon name={Icon.select({ ios: 'star.fill', android: import('@expo/material-symbols/star.xml'), })} size={24} />
Example
Both sides ship to both platforms. Prefer Icon.select when bundle size
matters.
<Icon name={{ ios: 'star.fill', android: require('@expo/material-symbols/star.xml'), }} size={24} />
Example
import StarIcon from '@expo/material-symbols/star.xml'; <Icon name={StarIcon} size={24} />
Example
<Icon name="star.fill" size={24} />
Props for the Icon component.
stringAccessibility label for screen readers. On Android, maps to
contentDescription. iOS accessibility is not yet wired up.
booleanWhether the component is disabled. Disabled components do not respond to user interaction.
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.
IconNameIcon source. Android expects an XML vector drawable asset (typically from
@expo/material-symbols); iOS expects an SF Symbol string.
Use Icon.select for a cross-platform definition.
() => voidCalled when the component appears on screen.
() => voidCalled when the component is removed from screen.
numberIcon size in dp (Android) / points (iOS). When omitted, the icon uses its intrinsic size.
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.
Component Methods
| Parameter | Type |
|---|---|
| spec | IconSelectSpec |
Picks the icon source for the current platform — android on Android,
ios on iOS.
Pair with @expo/ui/babel-plugin to strip the unused side per platform.
SFSymbols7_0 | ImageSourcePropTypeExample
const STAR = Icon.select({ ios: 'star.fill', android: import('@expo/material-symbols/star.xml'), }); <Icon name={STAR} size={24} />
Interfaces
Argument shape accepted by Icon.select.
The android slot accepts either a synchronous require() result or a
dynamic import('*.xml') expression. The latter is preferred because
TypeScript validates the literal path through the package's exports map,
catching typos at compile time. The accompanying Babel plugin
(@expo/ui/babel-plugin, auto-loaded by babel-preset-expo) rewrites the
import() to a require() so Metro can still tree-shake the unused side.
| Property | Type | Description |
|---|---|---|
| android | ImageSourcePropType | Promise<{
default: ImageSourcePropType
}> | - |
| ios | SFSymbols7_0 | - |
Types
A platform-specific icon definition.
Pass a primitive (require()'d XML asset on Android, string SF Symbol on
iOS) or use Icon.select for a cross-platform definition.
The plain object form ({ ios, android }) is also accepted but does not
tree-shake — the Android bundle still includes the iOS asset and vice versa.
Prefer Icon.select so the babel-preset-expo plugin can rewrite the call
into a Platform.OS ternary that Metro DCE can fold per platform.
Type: SFSymbol or ImageSourcePropType or object shaped as below:
| Property | Type | Description |
|---|---|---|
| android | ImageSourcePropType | - |
| ios | SFSymbol | - |