This is documentation for the next SDK version. For up-to-date documentation, see the latest version (SDK 55).

图像

一个用于显示 SF Symbols 的 SwiftUI Image 组件。

iOS

tvOS

GitHub

npm

更新日志

Expo UI Image 使用 SwiftUI Image API 显示 SF Symbols。SF Symbols 是 Apple 提供的可配置符号库。

安装

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.

用法

基本 SF Symbol

BasicImageExample.tsx

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

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

带尺寸和颜色

ImageSizeColorExample.tsx

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

export default function ImageSizeColorExample() {
  return (
    <Host matchContents>
      <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>
  );
}

带可变值

某些 SF Symbols 会根据可变值改变其外观。使用 variableValue 属性并传入 0.0 到 1.0 之间的值来控制渲染出的符号。需要 iOS 16.0+ 和 SF Symbols 4.0+。

ImageVariableExample.tsx

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

export default function ImageVariableExample() {
  return (
    <Host matchContents>
      <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>
  );
}

API

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

Component

`Image`

iOS

tvOS

Type: React.Element<ImageProps>

ImageProps

`color`

iOS

tvOS

Optional • Type: ColorValue

The color of the system image. Can be a color name like '#ff00ff', 'red', 'blue', etc.

`onPress`

iOS

tvOS

Optional • Type: () => void

Callback triggered when the view is pressed.

`size`

iOS

tvOS

Optional • Type: number

The size of the system image.

`systemName`

iOS

tvOS

Optional • Type: SFSymbols7_0

The name of the system image (SF Symbol). For example: 'photo', 'heart.fill', 'star.circle'

`uiImage`

iOS

tvOS

Optional • Type: string

The URI of the local image file to display. For example: 'file:///path/to/image.jpg' Performs a synchronous read operation that blocks the main thread.

`variableValue`

iOS16.0+

tvOS16.0+

Optional • Type: number

The variable value that alters the symbol's appearance. A number between 0.0 and 1.0. Only works with SF Symbols that support variable values (SF Symbols 4.0+).

Inherited Props

CommonViewModifierProps