推荐使用：React Native Touch ID —— 生物识别认证的利器

import React from 'react';
import { View, Text } from 'react-native';
import RNTouchID from 'react-native-touch-id';
 
export default class App extends React.Component {
  componentDidMount() {
    this._authenticateUser();
  }
 
  _authenticateUser = async () => {
    try {
      const isAuthenticated = await RNTouchID.authenticate('Scan your fingerprint to authenticate.');
      if (isAuthenticated) {
        // User authenticated successfully
        console.log('Authentication successful');
      } else {
        // User did not authenticate successfully
        console.log('Authentication failed');
      }
    } catch (e) {
      console.error(e);
      // Handle possible errors:
      // - RNTouchID.PasscodeNotFoundError (User has no passcode set)
      // - RNTouchID.SystemCancelError (System cancelled authentication)
      // - RNTouchID.UserCancelError (User cancelled authentication)
      // - RNTouchID.AuthenticationFailedError (User failed authentication)
      // - RNTouchID.LockoutError (User attempted authentication with too many failed attempts)
      // - RNTouchID.LAError (An error occurred in the LocalAuthentication API)
      // You can also handle other errors if you'd like
    }
  };
 
  render() {
    return (
      <View>
        <Text>Touch ID Authentication Example</Text>
      </View>
    );
  }
}

这段代码示例展示了如何在React Native应用中集成Touch ID认证。它首先导入了必要的React Native组件和react-native-touch-id库。在组件挂载后，它调用_authenticateUser方法进行用户认证。如果用户通过了生物识别认证，控制台会输出"Authentication successful"；如果未能通过，则输出"Authentication failed"并处理可能的错误。这是一个简洁而完整的示例，展示了如何在React Native应用中使用生物特征认证。