GraphQLQuery.swift

import Foundation

let swapiURL: URL = URL(string: "https://swapi.graph.cool/")!


func query() {
    let query: String =
    """
    query allFilms($filter: FilmFilter) {
      allFilms(filter: $filter) {
        title
        director
        starships {
          pilots {
            name
          }
        }
      }
    }
    """

    struct Filter: Encodable {
        let director: String
    }

    struct Variable: Encodable {
        let filter: Filter
    }

    let filter = Filter(director: "Irvin Kershner")
    let variable = Variable(filter: filter)


    struct Payload<T: Encodable>: Encodable {
        let variables: T
        let query: String
    }

    let payload = Payload(variables: variable, query: allFilmsQuery)
    var request = URLRequest(url: swapiURL)
    request.httpBody = try! JSONEncoder().encode(payload)
    request.httpMethod = "POST"
    request.addValue("application/json", forHTTPHeaderField: "Content-Type")
    request.addValue("application/json", forHTTPHeaderField: "Accept")
    URLSession.shared.dataTask(with: request) { (data, response, error) in
        guard let data = data else {
            return print("data is null")
        }
        let swiftyJsonVar = try! JSONSerialization.jsonObject(with: data, options: .allowFragments) as! [String: Any]
        print(swiftyJsonVar)
    }.resume()
}

query()