ViewController+InstaFoodService.swift

import UIKit
import Moya

class ViewController: UIViewController {
  
  private let instaFoodProvider = MoyaProvider<InstaFoodService>()
    
  override func viewDidLoad() {
    super.viewDidLoad()
    
    instaFoodProvider.request(.createUser(firstName: "Leo", lastName: "Kwan")) { (result) in
      
      switch result {
        
      case .success(let response):
        
        // let data = response.data
        // let statusCode = response.statusCode
        
        
        // Or you can use this wrapper from Moya
        // convenient method to filter status codes from 200-399
        do {
          try response.filterSuccessfulStatusCodes()
          let data = try response.mapJSON()
          print(data)
        } catch let error{
          print(error)
        }
        
      case .failure(let error): break
        print(error)
      }
    }
    
  }
}



// InstaFood Service APIManager ... Moya-Style
enum InstaFoodService {
  case createUser(firstName: String, lastName: String)
}

extension InstaFoodService: TargetType {
  
  var baseURL: URL {
    return URL(string: "https://api.instafood.com")!
  }
  
  var path: String {
    switch self {
    case .createUser(_, _):
      return "/user/"
    }
  }
  
  var method: Moya.Method {
    switch self {
    case .createUser:
      return .get
    }
  }
  
  var task: Task {
    switch self {
    case .createUser:
      return .request
    }
  }
  
  var parameters: [String: Any]? {
    switch self {
    case .createUser(let firstName, let lastName):
      return ["first_name": firstName, "last_name": lastName]
    }
  }
  
  var parameterEncoding: ParameterEncoding {
    switch self {
    case .createUser:
      // Send parameters as JSON in request body
      return JSONEncoding.default
    }
  }
  
  var sampleData: Data {
    switch self {
    case .createUser(let firstName, let lastName):
      let userJson = [
        "firstName": firstName,
        "lastName": lastName
      ]
      return jsonSerializedUTF8(json: userJson)
    }
  }
  
  private func jsonSerializedUTF8(json: [String: Any]) -> Data {
    return try! JSONSerialization.data(withJSONObject: json, options: [.prettyPrinted])
  }
}

struct User {
    let firstName: String
    let lastName: String
}