useTheme

useTheme 钩子让我们可以访问当前活动的主题。你可以在自己的组件中使用它，让它们响应主题的更改。

¥The useTheme hook lets us access the currently active theme. You can use it in your own components to have them respond to changes in the theme.

import * as React from 'react';
import { TouchableOpacity, Text } from 'react-native';
import { useTheme } from '@react-navigation/native';

// Black background and white text in light theme, inverted on dark theme
function MyButton() {
  const { colors } = useTheme();

  return (
    <TouchableOpacity style={{ backgroundColor: colors.card }}>
      <Text style={{ color: colors.text }}>Button!</Text>
    </TouchableOpacity>
  );
}

有关如何配置主题的更多详细信息和使用指南，请参阅 主题指南。

¥See theming guide for more details and usage guide around how to configure themes.

与类组件一起使用

¥Using with class component

你可以将类组件封装在函数组件中以使用钩子：

¥You can wrap your class component in a function component to use the hook:

class MyButton extends React.Component {
  render() {
    // Get it from props
    const { theme } = this.props;
  }
}

// Wrap and export
export default function (props) {
  const theme = useTheme();

  return <MyButton {...props} theme={theme} />;
}