如何在React Native中使用SignalR？

import React, { useEffect, useState } from 'react';
import { HubConnectionBuilder } from '@microsoft/signalr';

const App = () => {
  const [connection, setConnection] = useState(null);
  const [message, setMessage] = useState('');

  useEffect(() => {
    // 创建SignalR连接
    const createConnection = async () => {
      const hubUrl = 'https://example.com/signalr'; // 替换为实际的SignalR服务器URL
      const newConnection = new HubConnectionBuilder()
        .withUrl(hubUrl)
        .build();

      // 定义事件处理程序
      newConnection.on('ReceiveMessage', (receivedMessage) => {
        setMessage(receivedMessage);
      });

      // 启动连接
      try {
        await newConnection.start();
        setConnection(newConnection);
      } catch (error) {
        console.log('SignalR连接错误:', error);
      }
    };

    createConnection();
  }, []);

  const sendMessage = async () => {
    if (connection) {
      try {
        await connection.invoke('SendMessage', message); // 发送消息到SignalR服务器
        setMessage('');
      } catch (error) {
        console.log('发送消息错误:', error);
      }
    }
  };

  return (
    <View>
      <TextInput
        value={message}
        onChangeText={setMessage}
        placeholder="输入消息"
      />
      <Button title="发送" onPress={sendMessage} />
      <Text>{message}</Text>
    </View>
  );
};

export default App;