BottomSheet

一个从屏幕底部滑出的模态面板。

Android

iOS

Web

Included in Expo Go

Recommended version:

~57.0.3

一个从屏幕底部滑出的模态面板。面板的可见性是可控的——通过 React 状态切换 isPresented，并可以从 onDismiss 关闭（当用户向下滑动或点击遮罩时调用）。

🌐 A modal sheet that slides up from the bottom of the screen. The sheet's visibility is controlled — toggle isPresented from React state and dismiss it from onDismiss (called when the user swipes down or taps the overlay).

安装

🌐 Installation

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

🌐 Usage

基本底部面板

🌐 Basic bottom sheet

BottomSheetExample.tsx

import { useState } from 'react';
import { Host, Column, Button, BottomSheet, Text } from '@expo/ui';

export default function BottomSheetExample() {
  const [isPresented, setIsPresented] = useState(false);

  return (
    <Host style={{ flex: 1 }}>
      <Button label="Open sheet" onPress={() => setIsPresented(true)} />
      <BottomSheet isPresented={isPresented} onDismiss={() => setIsPresented(false)}>
        <Column spacing={12}>
          <Text textStyle={{ fontSize: 18, fontWeight: '700' }}>Sheet contents</Text>
          <Text>Drag down or tap the overlay to dismiss.</Text>
          <Button label="Close" onPress={() => setIsPresented(false)} />
        </Column>
      </BottomSheet>
    </Host>
  );
}

隐藏拖动指示器

🌐 Hiding the drag indicator

对于没有把手的板材，请传入 showDragIndicator={false}。

🌐 Pass showDragIndicator={false} for sheets without a handle.

BottomSheetNoIndicatorExample.tsx

import { useState } from 'react';
import { Host, Button, BottomSheet, Text } from '@expo/ui';

export default function BottomSheetNoIndicatorExample() {
  const [isPresented, setIsPresented] = useState(false);

  return (
    <Host style={{ flex: 1 }}>
      <Button label="Open" onPress={() => setIsPresented(true)} />
      <BottomSheet
        isPresented={isPresented}
        onDismiss={() => setIsPresented(false)}
        showDragIndicator={false}>
        <Text>No drag handle.</Text>
      </BottomSheet>
    </Host>
  );
}

吸附点

🌐 Snap points

传入 snapPoints 以让用户在多个停靠高度之间拖动底部弹出层。你可以使用语义值 'half' 和 'full' 来实现跨平台一致性。{ fraction } 和 { height } 形式在 iOS 和网页上都能准确支持。

🌐 Pass snapPoints to let the user drag the sheet between multiple resting heights. You can use the semantic values 'half' and 'full' for cross-platform parity. The { fraction } and { height } forms are honored precisely on iOS and web.

当表格内容可能比最小吸附点更高时，将其封装在 ScrollView 中，以便溢出内容能够正确滚动。

🌐 When sheet content can be taller than the smallest snap point, wrap it in a ScrollView so the overflow scrolls correctly.

BottomSheetSnapPointsExample.tsx

import { useState } from 'react';
import { Host, BottomSheet, Button, Column, ScrollView, Text } from '@expo/ui';

export default function BottomSheetSnapPointsExample() {
  const [isPresented, setIsPresented] = useState(false);

  return (
    <Host style={{ flex: 1 }}>
      <Button label="Open" onPress={() => setIsPresented(true)} />
      <BottomSheet
        isPresented={isPresented}
        onDismiss={() => setIsPresented(false)}
        snapPoints={['half', 'full']}>
        <ScrollView>
          <Column spacing={12}>
            <Text textStyle={{ fontSize: 20, fontWeight: '700' }}>Half / full sheet</Text>
            <Text>Drag the sheet between half and full screen height.</Text>
          </Column>
        </ScrollView>
      </BottomSheet>
    </Host>
  );
}

在 Android 上，{ fraction } 和 { height } 会吸附到最近的 'half' / 'full' —— 底层的 ModalBottomSheet 仅支持两个静止状态。部分状态只有在内容足够高以超过 Material 的部分阈值时才可见；如果你需要在短内容上显示半状态，请为内容指定明确的高度或填充可用空间。

应用接口

🌐 API

import { BottomSheet } from '@expo/ui';

Component

`BottomSheet`

Type: React.Element<BottomSheetProps>

A modal sheet that slides up from the bottom of the screen.

Props for the BottomSheet component, a modal sheet that slides up from the bottom of the screen.

BottomSheetProps

`children`

Optional • Type: ReactNode

Content to render inside the bottom sheet.

`isPresented`

Type: boolean

Whether the bottom sheet is currently visible.

`modifiers`

Optional • Type: ModifierConfig[]

Platform-specific modifier escape hatch. Pass an array of modifier configs from @expo/ui/swift-ui/modifiers or @expo/ui/jetpack-compose/modifiers.

`onDismiss`

Type: () => void

Called when the bottom sheet is dismissed by the user (e.g. swiping down or tapping the overlay).

`showDragIndicator`

Optional • Type: boolean • Default: true

Whether to show a drag indicator at the top of the sheet.

`snapPoints`

Optional • Type: SnapPoint[]

Heights the sheet can rest at. When omitted, the sheet auto-sizes to its content. See SnapPoint for the supported values.

Example

``['half', 'full'] — draggable between half and full

Example

``['full'] — always full height

`testID`

Optional • Type: string

Identifier used to locate the component in end-to-end tests.

Types

`SnapPoint`

A snap point describing one of the heights a BottomSheet can rest at.

'half' — Approximately half-screen.
'full' — Fully expanded.
{ fraction } — A fraction of the screen height (0–1). iOS / web only.
{ height } — A fixed pixel height. iOS / web only.

On Android, { fraction } and { height } snap to the nearest of 'half' / 'full'. See the component docs for platform behavior notes.

Type: 'half' or 'full' or object shaped as below:

Property	Type	Description
fraction	`number`	-

Or object shaped as below:

Property	Type	Description
height	`number`	-