To use the generated operations inRocketReserverAPI, you first create an instance ofApolloClient. This instance takes your generated code and uses it to make network calls to your server. It's recommended that this instance is a singleton or static instance that's accessible from anywhere in your codebase.

Create an ApolloClient

1. Create a new Swift file withinRocketReserver calledNetwork.swift. Set the target toRocketReserver and addimport Apollo to the top of the file.

2. Now add the following code into the file:

1class Network {2  static let shared= Network()34  private(set)lazy var apollo= ApolloClient(url:URL(string:"https://apollo-fullstack-tutorial.herokuapp.com/graphql")!)5}

Implement the query

To make sure yourApolloClient instance is communicating correctly with the server, go toLaunchListViewModel, add these imports, then add the following code to theinit() method just below the TODO:

1import Apollo2import RocketReserverAPI34...56init() {7    // TODO (Section 13 - https://www.apollographql.com/docs/ios/tutorial/tutorial-subscriptions#use-your-subscription)8    Network.shared.apollo.fetch(query:LaunchListQuery()) { resultin9        switch result {10        case .success(let graphQLResult):11            print("Success! Result:\(graphQLResult)")12        case .failure(let error):13            print("Failure! Error:\(error)")14        }15    }16}

Test your query

Build and run your application. The web host might take a few seconds to spin up your GraphQL server if nobody's been using it recently, but once it's up, you should see a response that resembles the following:

This means the request was correctly executed and you now have a list oflaunch sites 🚀🚀🚀.

Go ahead and remove the code added to theinit() method so there is just the TODO for later:

1init() {2    // TODO (Section 13 - https://www.apollographql.com/docs/ios/tutorial/tutorial-subscriptions#use-your-subscription)3}