单选按钮
一个用于单选控制的 Jetpack Compose 单选按钮组件。
Android
Included in Expo Go
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用于从一组选项中选择单个选项的单选按钮组件。映射到官方的 Jetpack Compose RadioButton API。

安装
Terminal
- npx expo install @expo/uiIf you are installing this in an existing React Native app, make sure to install expo in your project.
用法
基础单选按钮
一个带有 onClick 处理程序的独立单选按钮。
BasicRadioButton.tsx
import { useState } from 'react'; import { Host, RadioButton } from '@expo/ui/jetpack-compose'; export default function BasicRadioButton() { const [selected, setSelected] = useState(false); return ( <Host matchContents> <RadioButton selected={selected} onClick={() => setSelected(!selected)} /> </Host> ); }
单选组(推荐)
单选组的推荐模式遵循 Compose 无障碍指南:
- 使用带有
selectableGroup()修饰符的Column包裹该组,以便屏幕阅读器将这些选项视为一个组。 - 在每个
Row上应用带有role: 'radioButton'的selectable修饰符,使整行(包括标签)都可点击。 - 不要为
RadioButton本身传入onClick,由行来处理交互。这样可以提供更大的触控目标。
RadioGroup.tsx
import { useState } from 'react'; import { Host, Column, Row, RadioButton, Text } from '@expo/ui/jetpack-compose'; import { selectable, selectableGroup, fillMaxWidth, height, padding, } from '@expo/ui/jetpack-compose/modifiers'; export default function RadioGroup() { const [selectedOption, setSelectedOption] = useState('Calls'); const options = ['Calls', 'Missed', 'Friends']; return ( <Host matchContents> <Column modifiers={[selectableGroup()]}> {options.map(label => ( <Row key={label} verticalAlignment="center" modifiers={[ fillMaxWidth(), height(56), selectable(label === selectedOption, () => setSelectedOption(label), 'radioButton'), padding(16, 0, 16, 0), ]}> <RadioButton selected={label === selectedOption} /> <Text modifiers={[padding(16, 0, 0, 0)]}>{label}</Text> </Row> ))} </Column> </Host> ); }
API
import { RadioButton } from '@expo/ui/jetpack-compose';
Component
Type: React.Element<RadioButtonProps>
A Material Design radio button.