How to implement graphql subscription using apollo ios client

Question

I am trying to implement graphql subscription using apollo ios client. But not able to figure it out as lack of documentation examples. Example given on apollo documentation

Answer 1

Here's my ApolloClient setup for just a web socket transport client:

let connectingPayload = ["authToken": accessToken]
let urlRequest = URLRequest(url: baseURL)
let webSocketTransport = WebSocketTransport(request: urlRequest, sendOperationIdentifiers: false, connectingPayload: connectingPayload)

let apollo = ApolloClient(networkTransport: webSocketTransport)