下面是我的graphqlClient.ts文件：

import {
  ApolloClient,
  HttpLink,
  ApolloLink,
  InMemoryCache,
  concat,
  Operation,
  NextLink,
  FetchResult,
  Observable,
  split,
} from '@apollo/client';
import { getMainDefinition } from '@apollo/client/utilities';
import auth, { FirebaseAuthTypes } from '@react-native-firebase/auth';
import Config from 'react-native-config';

const httpLink = new HttpLink({ uri: Config.BE_BASE_URL });

import { GraphQLWsLink } from '@apollo/client/link/subscriptions';
import { createClient } from 'graphql-ws';

const wsLink = new GraphQLWsLink(
  createClient({
    url: 'ws://my-gqlserver.railway.app/graphql',
  }),
);

const splitLink = split(
  ({ query }) => {
    const definition = getMainDefinition(query);
    return (
      definition.kind === 'OperationDefinition' &&
      definition.operation === 'subscription'
    );
  },
  wsLink,
  httpLink,
);

const authMiddleware = new ApolloLink(
  (operation: Operation, forward: NextLink): Observable<FetchResult> => {
    return new Observable(observer => {
      (async () => {
        const currentUser: FirebaseAuthTypes.User | null = auth().currentUser;
        const token = currentUser ? await currentUser.getIdToken(false) : null;
        operation.setContext({
          headers: {
            Authorization: token ? `Bearer ${token}` : '',
          },
        });
        return forward(operation).subscribe({
          next: observer.next.bind(observer),
          error: observer.error.bind(observer),
          complete: observer.complete.bind(observer),
        });
      })();
    });
  },
);

const graphQLClient = new ApolloClient({
  cache: new InMemoryCache(),
  link: concat(authMiddleware, splitLink),
});

export default graphQLClient;

字符串
下面是查询：

export const SUBSCRIBE_TO_LOCATIONS = gql`
  subscription Subscription {
    locations
  }
`;

型
在主屏幕上，我使用@apollo/client中的useSubscription挂钩
HomeScreen.tsx：

import { useSubscription, useQuery } from '@apollo/client';
import { SUBSCRIBE_TO_LOCATIONS } from '../graphql/queries';

  const { data: subscriptionData, loading: subscritionLoading } =
    useSubscription(SUBSCRIBE_TO_LOCATIONS, {
      onData: subData => {
        console.log('onData', subData);
      },
    });

  console.log(subscriptionData, 'subscriptionData'); 
  //  iOS ==> undefined subscriptionData
 //   android ==> array of coordinates

型
我做的一切都是从官方文档开始的，对于websocekt协议，我使用graphql-ws，因为subscriptions-transport-ws已经过时了，正如文档中提到的那样。
我很确定一切都连接得很好，因为在android上它应该如何工作，所以我猜是有一些elese我需要在ios上配置，但我不确定是什么。