TabView

一个用于分页或选项卡内容的 SwiftUI TabView 组件。

iOS

tvOS

Included in Expo Go

GitHub

npm

更新日志

Bundled version:

~56.0.6

Expo UI TabView 与官方 SwiftUI TabView API 一致，并通过 tabViewStyle 修饰符在不同样式之间切换。

注意：对于跨全屏路由的有路由底部标签导航，请改用 expo-router/unstable-native-tabs`。

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

每个页面都是一个 <TabView.Tab> 子组件，通过 value 属性进行标识。TabView 本身不会强制设定高度——请为它设置一个 frame，或者将它放在一个会提供高度的父容器中。

页面样式（可滑动分页器）

使用 tabViewStyle({ type: 'page' }) 可获得带可选圆点指示器的横向分页器。传入 defaultSelection 可让分页器从指定页面开始，而无需由 React 来控制它。

PagerExample.tsx

import { Host, Spacer, TabView, Text, VStack } from '@expo/ui/swift-ui';
import {
  background,
  font,
  foregroundStyle,
  frame,
  tabViewStyle,
} from '@expo/ui/swift-ui/modifiers';

const fillFrame = frame({ maxWidth: Infinity, maxHeight: Infinity });
const pageFrame = frame({ minHeight: 320, maxHeight: 320 });

export default function PagerExample() {
  return (
    <Host style={{ flex: 1 }}>
      <TabView defaultSelection="1" modifiers={[pageFrame, tabViewStyle({ type: 'page' })]}>
        <TabView.Tab value="0">
          <Page label="第 1 页" color="#6200EE" />
        </TabView.Tab>
        <TabView.Tab value="1">
          <Page label="第 2 页" color="#03DAC5" />
        </TabView.Tab>
        <TabView.Tab value="2">
          <Page label="第 3 页" color="#FF5722" />
        </TabView.Tab>
      </TabView>
    </Host>
  );
}

function Page({ label, color }: { label: string; color: string }) {
  return (
    <VStack alignment="center" modifiers={[fillFrame, background(color)]}>
      <Spacer />
      <Text modifiers={[font({ size: 28, weight: 'bold' }), foregroundStyle('#FFFFFF')]}>
        {label}
      </Text>
      <Spacer />
    </VStack>
  );
}

受控选择

传入 selection 和 onSelectionChange，即可通过 React 状态驱动当前激活的标签页。每个 <TabView.Tab> 的 value 都会与 selection 进行匹配。当 selection 从 JS 发生变化时，添加 animation 修饰符可为切换添加动画。

ControlledTabViewExample.tsx

import { useState } from 'react';
import { Button, Host, Spacer, TabView, Text, VStack } from '@expo/ui/swift-ui';
import {
  animation,
  Animation,
  background,
  font,
  foregroundStyle,
  frame,
  tabViewStyle,
} from '@expo/ui/swift-ui/modifiers';

const fillFrame = frame({ maxWidth: Infinity, maxHeight: Infinity });
const pageFrame = frame({ minHeight: 320, maxHeight: 320 });

export default function ControlledTabViewExample() {
  const [selected, setSelected] = useState('0');

  return (
    <Host style={{ flex: 1 }}>
      <VStack>
        <Text>已选择：{selected}</Text>
        <Button label="跳转到第 3 页" onPress={() => setSelected('2')} />
        <TabView
          selection={selected}
          onSelectionChange={setSelected}
          modifiers={[
            pageFrame,
            tabViewStyle({ type: 'page' }),
            animation(Animation.default, Number(selected)),
          ]}>
          <TabView.Tab value="0">
            <Page label="第 1 页" color="#6200EE" />
          </TabView.Tab>
          <TabView.Tab value="1">
            <Page label="第 2 页" color="#03DAC5" />
          </TabView.Tab>
          <TabView.Tab value="2">
            <Page label="第 3 页" color="#FF5722" />
          </TabView.Tab>
        </TabView>
      </VStack>
    </Host>
  );
}

function Page({ label, color }: { label: string; color: string }) {
  return (
    <VStack alignment="center" modifiers={[fillFrame, background(color)]}>
      <Spacer />
      <Text modifiers={[font({ size: 28, weight: 'bold' }), foregroundStyle('#FFFFFF')]}>
        {label}
      </Text>
      <Spacer />
    </VStack>
  );
}

页面指示圆点

结合 tabViewStyle({ type: 'page' }) 使用 indexViewStyle 修饰符来控制圆点指示器。将 indexDisplayMode 设为 'always'、'never' 或 'automatic'，并设置 backgroundDisplayMode 以在圆点后渲染一个半透明胶囊背景。

PageIndicatorExample.tsx

import { Host, Spacer, TabView, Text, VStack } from '@expo/ui/swift-ui';
import {
  background,
  font,
  foregroundStyle,
  frame,
  indexViewStyle,
  tabViewStyle,
} from '@expo/ui/swift-ui/modifiers';

const fillFrame = frame({ maxWidth: Infinity, maxHeight: Infinity });
const pageFrame = frame({ minHeight: 320, maxHeight: 320 });

export default function PageIndicatorExample() {
  return (
    <Host style={{ flex: 1 }}>
      <TabView
        modifiers={[
          pageFrame,
          tabViewStyle({ type: 'page', indexDisplayMode: 'always' }),
          indexViewStyle({ backgroundDisplayMode: 'always' }),
        ]}>
        <TabView.Tab value="0">
          <Page label="第 1 页" color="#4F8DF6" />
        </TabView.Tab>
        <TabView.Tab value="1">
          <Page label="第 2 页" color="#34C759" />
        </TabView.Tab>
        <TabView.Tab value="2">
          <Page label="第 3 页" color="#FF9F0A" />
        </TabView.Tab>
      </TabView>
    </Host>
  );
}

function Page({ label, color }: { label: string; color: string }) {
  return (
    <VStack alignment="center" modifiers={[fillFrame, background(color)]}>
      <Spacer />
      <Text modifiers={[font({ size: 28, weight: 'bold' }), foregroundStyle('#FFFFFF')]}>
        {label}
      </Text>
      <Spacer />
    </VStack>
  );
}

底部标签栏

使用 tabViewStyle({ type: 'automatic' }) 可获得 SwiftUI 默认的标签栏。每个标签页的 label 和 systemImage 会填充到栏项目中。可在某个标签页上使用 badge 修饰符，为其栏项目添加徽标。

注意：对于跨全屏路由的有路由底部标签导航，请改用 expo-router/unstable-native-tabs`。

BottomTabsExample.tsx

import { useState } from 'react';
import { Host, Spacer, TabView, Text, VStack } from '@expo/ui/swift-ui';
import {
  background,
  badge,
  font,
  foregroundStyle,
  frame,
  tabViewStyle,
} from '@expo/ui/swift-ui/modifiers';

const fillFrame = frame({ maxWidth: Infinity, maxHeight: Infinity });

export default function BottomTabsExample() {
  const [selected, setSelected] = useState('inbox');

  return (
    <Host style={{ flex: 1 }}>
      <TabView
        selection={selected}
        onSelectionChange={setSelected}
        modifiers={[tabViewStyle({ type: 'automatic' })]}>
        <TabView.Tab value="inbox" label="收件箱" systemImage="tray.fill" modifiers={[badge('3')]}>
          <Page label="收件箱" color="#4F8DF6" />
        </TabView.Tab>
        <TabView.Tab value="sent" label="已发送" systemImage="paperplane.fill">
          <Page label="已发送" color="#34C759" />
        </TabView.Tab>
        <TabView.Tab value="drafts" label="草稿" systemImage="square.and.pencil">
          <Page label="草稿" color="#FF9F0A" />
        </TabView.Tab>
      </TabView>
    </Host>
  );
}

function Page({ label, color }: { label: string; color: string }) {
  return (
    <VStack alignment="center" modifiers={[fillFrame, background(color)]}>
      <Spacer />
      <Text modifiers={[font({ size: 28, weight: 'bold' }), foregroundStyle('#FFFFFF')]}>
        {label}
      </Text>
      <Spacer />
    </VStack>
  );
}

API

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

Component

`TabView`

iOS

Type: React.Element<TabViewProps>

A SwiftUI TabView. Pair with modifiers to choose the appearance:

tabViewStyle({ type: 'page' }) — swipeable pager.
tabViewStyle({ type: 'automatic' }) — bottom tab bar.
tabViewStyle({ type: 'sidebarAdaptable' }) — sidebar on iPad, tab bar on iPhone.

Use <TabView.Tab> children to define pages. Each tab is identified by its value prop, which is used for selection.

For routed bottom-tab navigation across full-screen routes, prefer expo-router/unstable-native-tabs.

TabViewProps

`children`

iOS

Type: React.ReactNode

The tab's content — rendered when this tab is selected.

`label`

iOS

Optional • Type: string

Text label shown in the tab bar or sidebar.

`systemImage`

iOS

Optional • Type: SFSymbol

SF Symbol name shown alongside the label.

`value`

iOS

Type: string

Identifies this tab. Matched against the parent TabView's selection and defaultSelection props.

Inherited Props

CommonViewModifierProps

`children`

iOS

Literal type: union

<TabView.Tab> elements defining the pages.

Acceptable values are: React.ReactElement | React.ReactElement

`defaultSelection`

iOS

Optional • Type: string

The initially selected tab when the component is uncontrolled (no selection prop). Ignored if selection is provided.

`onSelectionChange`

iOS

Optional • Type: (selection: string) => void

Called when the selected tab changes.

`selection`

iOS

Optional • Type: string

The selected tab (controlled mode). Pair with onSelectionChange. Pass defaultSelection instead to let the native view manage state.

Inherited Props

CommonViewModifierProps