Reference version

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进度视图

一个用于显示进度指示器的 SwiftUI ProgressView 组件。

iOS
tvOS
Included in Expo Go
Recommended version:
~56.0.16

Expo UI ProgressView 与官方 SwiftUI ProgressView API 保持一致,并支持通过 progressViewStyle 修饰符进行样式设置。

不确定状态的 spinner 和一个带标签的确定性 ProgressView

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

不确定进度

当未提供 value 时,进度视图会显示不确定状态指示器(spinner)。

IndeterminateExample.tsx
import { Host, ProgressView } from '@expo/ui/swift-ui'; export default function IndeterminateExample() { return ( <Host matchContents> <ProgressView /> </Host> ); }

确定进度

提供一个介于 01 之间的 value 来显示确定进度。

DeterminateExample.tsx
import { Host, ProgressView } from '@expo/ui/swift-ui'; export default function DeterminateExample() { return ( <Host style={{ flex: 1 }}> <ProgressView value={0.5} /> </Host> ); }

进度视图样式

使用 progressViewStyle 修饰符来更改进度视图的外观。可用样式有:automaticlinearcircular

ProgressViewStylesExample.tsx
import { Host, ProgressView, VStack } from '@expo/ui/swift-ui'; import { progressViewStyle } from '@expo/ui/swift-ui/modifiers'; export default function ProgressViewStylesExample() { return ( <Host style={{ flex: 1 }}> <ProgressView value={0.5} modifiers={[progressViewStyle('linear')]} /> </Host> ); }

带标签

你可以将自定义组件作为 children 传入,为进度视图提供标签。

LabelExample.tsx
import { Host, ProgressView, Text } from '@expo/ui/swift-ui'; export default function LabelExample() { return ( <Host style={{ flex: 1 }}> <ProgressView value={0.25}> <Text>加载中...</Text> </ProgressView> </Host> ); }

着色进度视图

使用 tint 修饰符来更改进度视图的颜色。

TintedExample.tsx
import { Host, ProgressView } from '@expo/ui/swift-ui'; import { tint } from '@expo/ui/swift-ui/modifiers'; export default function TintedExample() { return ( <Host style={{ flex: 1 }}> <ProgressView value={0.7} modifiers={[tint('red')]} /> </Host> ); }

基于计时器的进度

使用 timerInterval 属性创建一个可在时间范围内自动动画的进度视图。这对于显示倒计时器或定时操作很有用。

TimerExample.tsx
import { Host, ProgressView, Text, VStack } from '@expo/ui/swift-ui'; export default function TimerExample() { const startDate = new Date(); const endDate = new Date(Date.now() + 10000); // 距现在 10 秒 return ( <Host style={{ flex: 1 }}> <VStack spacing={16}> <ProgressView timerInterval={{ lower: startDate, upper: endDate }} /> <ProgressView timerInterval={{ lower: startDate, upper: endDate }} countsDown={false}> <Text>向上计数</Text> </ProgressView> </VStack> </Host> ); }

API

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

Component

ProgressView

iOS
tvOS

Type: React.Element<ProgressViewProps>

Renders a SwiftUI ProgressView component.

ProgressViewProps

children

iOS
tvOS
Optional • Type: React.ReactNode

A label describing the progress view's purpose.

countsDown

iOS 16.0+
tvOS 16.0+
Optional • Type: boolean • Default: true

A Boolean value that determines whether the view empties or fills as time passes. If true, which is the default, the view empties.

timerInterval

iOS 16.0+
tvOS 16.0+
Optional • Type: ClosedRangeDate

The lower and upper bounds for automatic timer progress.

value

iOS
tvOS
Optional • Literal type: union

The current progress value. A value between 0 and 1. When undefined, the progress view displays an indeterminate indicator.

Acceptable values are: number | null