Effettua una chiamata API REST in Swift

Sto cercando di utilizzare Swift per effettuare una chiamata GET a un'API REST e ho provato a seguire numerosi tutorial, ma non riesco a capirlo. O perché non riesco a capire come tradurre tutto l'Obj-C in Swift, o perché metà dei metodi n 'tali sono deprecati. Qualcuno sa come effettuare la chiamata e analizzare i dati JSON restituiti?

Puoi fare così:

var url : String = "http://google.com?test=toto&test2=titi"
var request : NSMutableURLRequest = NSMutableURLRequest()
request.URL = NSURL(string: url)
request.HTTPMethod = "GET"

NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue(), completionHandler:{ (response:NSURLResponse!, data: NSData!, error: NSError!) -> Void in
    var error: AutoreleasingUnsafeMutablePointer<NSError?> = nil
    let jsonResult: NSDictionary! = NSJSONSerialization.JSONObjectWithData(data, options:NSJSONReadingOptions.MutableContainers, error: error) as? NSDictionary

    if (jsonResult != nil) {
        // process jsonResult
    } else {
       // couldn't load JSON, look at error
    }


})

EDIT: Per le persone che hanno problemi con questo, forse il tuo flusso JSON è un array [] e non un oggetto {}, quindi devi cambiare jsonResult in NSArrayinvece diNSDictionary

Swift 5 e 4

let params = ["username":"john", "password":"123456"] as Dictionary<String, String>

var request = URLRequest(url: URL(string: "http://localhost:8080/api/1/login")!)
request.httpMethod = "POST"
request.httpBody = try? JSONSerialization.data(withJSONObject: params, options: [])
request.addValue("application/json", forHTTPHeaderField: "Content-Type")

let session = URLSession.shared
let task = session.dataTask(with: request, completionHandler: { data, response, error -> Void in
    print(response!)
    do {
        let json = try JSONSerialization.jsonObject(with: data!) as! Dictionary<String, AnyObject>
        print(json)
    } catch {
        print("error")
    }
})

task.resume()

Penso che l' NSURLSessionAPI si adatti meglio a questa situazione. Perché se scrivi codice swift, l'obiettivo del tuo progetto è almeno iOS 7 e iOS 7 supporta NSURLSessionapi. Comunque ecco il codice

let url = "YOUR_URL"

NSURLSession.sharedSession().dataTaskWithURL(NSURL(string: url)) { data, response, error in
    // Handle result
}.resume()

Ecco il codice completo per le richieste API REST utilizzando NSURLSession in swift

For GET Request

 let configuration = NSURLSessionConfiguration .defaultSessionConfiguration()
    let session = NSURLSession(configuration: configuration)


    let urlString = NSString(format: "your URL here")

    print("get wallet balance url string is \(urlString)")
    //let url = NSURL(string: urlString as String)
    let request : NSMutableURLRequest = NSMutableURLRequest()
    request.URL = NSURL(string: NSString(format: "%@", urlString) as String)
    request.HTTPMethod = "GET"
    request.timeoutInterval = 30

    request.addValue("application/json", forHTTPHeaderField: "Content-Type")
    request.addValue("application/json", forHTTPHeaderField: "Accept")

    let dataTask = session.dataTaskWithRequest(request) {
        (let data: NSData?, let response: NSURLResponse?, let error: NSError?) -> Void in

        // 1: Check HTTP Response for successful GET request
        guard let httpResponse = response as? NSHTTPURLResponse, receivedData = data
            else {
                print("error: not a valid http response")
                return
        }

        switch (httpResponse.statusCode)
        {
        case 200:

            let response = NSString (data: receivedData, encoding: NSUTF8StringEncoding)
            print("response is \(response)")


            do {
                let getResponse = try NSJSONSerialization.JSONObjectWithData(receivedData, options: .AllowFragments)

                EZLoadingActivity .hide()

               // }
            } catch {
                print("error serializing JSON: \(error)")
            }

            break
        case 400:

            break
        default:
            print("wallet GET request got response \(httpResponse.statusCode)")
        }
    }
    dataTask.resume()

Per richiesta POST ...

let configuration = NSURLSessionConfiguration .defaultSessionConfiguration()
    let session = NSURLSession(configuration: configuration)

    let params = ["username":bindings .objectForKey("username"), "provider":"walkingcoin", "securityQuestion":securityQuestionField.text!, "securityAnswer":securityAnswerField.text!] as Dictionary<String, AnyObject>

    let urlString = NSString(format: “your URL”);
    print("url string is \(urlString)")
    let request : NSMutableURLRequest = NSMutableURLRequest()
    request.URL = NSURL(string: NSString(format: "%@", urlString)as String)
    request.HTTPMethod = "POST"
    request.timeoutInterval = 30
    request.addValue("application/json", forHTTPHeaderField: "Content-Type")
    request.addValue("application/json", forHTTPHeaderField: "Accept")      
    request.HTTPBody  = try! NSJSONSerialization.dataWithJSONObject(params, options: [])

    let dataTask = session.dataTaskWithRequest(request)
        {
            (let data: NSData?, let response: NSURLResponse?, let error: NSError?) -> Void in
            // 1: Check HTTP Response for successful GET request
            guard let httpResponse = response as? NSHTTPURLResponse, receivedData = data
                else {
                    print("error: not a valid http response")
                    return
            }

            switch (httpResponse.statusCode)
            {
            case 200:

                let response = NSString (data: receivedData, encoding: NSUTF8StringEncoding)


                if response == "SUCCESS"
                {

                }

            default:
                print("save profile POST request got response \(httpResponse.statusCode)")
            }
    }
    dataTask.resume()

Spero che funzioni.

modificato per swift 2

let url = NSURL(string: "http://www.test.com")

    let task = NSURLSession.sharedSession().dataTaskWithURL(url!) {(data, response, error) in
        print(NSString(data: data!, encoding: NSUTF8StringEncoding))
    }

    task.resume()

Swift 4 - GET request

var request = URLRequest(url: URL(string: "http://example.com/api/v1/example")!)
request.httpMethod = "GET"

URLSession.shared.dataTask(with: request, completionHandler: { data, response, error -> Void in
    do {
        let jsonDecoder = JSONDecoder()
        let responseModel = try jsonDecoder.decode(CustomDtoClass.self, from: data!)
        print(responseModel)
    } catch {
        print("JSON Serialization error")
    }
}).resume()

Non dimenticare di configurare le impostazioni di sicurezza del trasporto app per aggiungere il tuo dominio alle eccezioni e consentire richieste http non sicure se stai raggiungendo gli endpoint senza utilizzare HTTPS.

Puoi utilizzare uno strumento come http://www.json4swift.com/ per generare automaticamente le tue mappature codificabili dalle tue risposte JSON.

Swift 3.0

let request = NSMutableURLRequest(url: NSURL(string: "http://httpstat.us/200")! as URL)
let session = URLSession.shared
request.httpMethod = "GET"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")

let task = session.dataTask(with: request as URLRequest, completionHandler: {data, response, error -> Void in
      if error != nil {
          print("Error: \(String(describing: error))")
      } else {
          print("Response: \(String(describing: response))")
      }
 })

 task.resume()

Swift 4

Crea un'app utilizzando Alamofire con il metodo Api Post

Installa il file pod -pod 'Alamofire', '~> 4.0' per Swift 3 con Xcode 9

Crea la classe Webservices.swift, importa Alamofire

Design storyBoard, Visualizzazione accesso

inserire il seguente codice per ViewControllerClass

import UIKit

class ViewController: UIViewController {

    @IBOutlet var usernameTextField: UITextField!

    @IBOutlet var passwordTextField: UITextField!
    var usertypeStr :String = "-----------"
    var loginDictionary : NSDictionary?
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func loginButtonClicked(_ sender: Any) {
        WebServices.userLogin(userName: usernameTextField.text!, password: passwordTextField.text!,userType: usertypeStr) {(result, message, status )in
            if status {
                let loginDetails = result as? WebServices
                self.loginDictionary = loginDetails?.loginData
                if self.loginDictionary?["status"] as? String == "error"
                {
                    self.alertMessage(alerttitle: "Login Error", (self.loginDictionary?["message"] as? String)!)
                } else if self.loginDictionary?["status"] as? String == "ok" {
                    self.alertMessage(alerttitle: "", "Success")

                }else {
                    self.alertMessage(alerttitle: "", (self.loginDictionary?["message"] as? String)!)
                }
            } else {
                self.alertMessage(alerttitle: "", "Sorry")
            }
        }
    }

    func alertMessage(alerttitle:String,_ message : String){
        let alertViewController = UIAlertController(title:alerttitle,  message:message, preferredStyle: .alert)
        alertViewController.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
        present(alertViewController, animated: true, completion: nil)
    }

}

Inserisci il seguente codice per WebserviceClass

import Foundation
import Alamofire
class WebServices: NSObject {
    enum WebServiceNames: String {
        case baseUrl = "https://---------------"
        case UserLogin = "------------"
    }

    // MARK: - Login Variables
    var loginData : NSDictionary?

    class func userLogin(userName: String,password : String,userType : String, completion : @escaping (_ response : AnyObject?, _ message: String?, _ success : Bool)-> ()) {
        let url = WebServiceNames.baseUrl.rawValue + WebServiceNames.UserLogin.rawValue
        let params = ["USER": userName,"PASS":password,"API_Key" : userType]
        WebServices.postWebService(urlString: url, params: params as [String : AnyObject]) { (response, message, status) in
            print(response ?? "Error")
            let result = WebServices()
            if let data = response as? NSDictionary {
                print(data)
                result.loginData = data
                completion(result, "Success", true)

            }else {
                completion("" as AnyObject?, "Failed", false)
            }
        }
    }
    //MARK :- Post
    class func postWebService(urlString: String, params: [String : AnyObject], completion : @escaping (_ response : AnyObject?, _ message: String?, _ success : Bool)-> Void) {
        alamofireFunction(urlString: urlString, method: .post, paramters: params) { (response, message, success) in
            if response != nil {
                completion(response as AnyObject?, "", true)
            }else{
                completion(nil, "", false)
            }
        }
    }

    class func alamofireFunction(urlString : String, method : Alamofire.HTTPMethod, paramters : [String : AnyObject], completion : @escaping (_ response : AnyObject?, _ message: String?, _ success : Bool)-> Void){

        if method == Alamofire.HTTPMethod.post {
            Alamofire.request(urlString, method: .post, parameters: paramters, encoding: URLEncoding.default, headers: nil).responseJSON { (response:DataResponse<Any>) in

                print(urlString)

                if response.result.isSuccess{
                    completion(response.result.value as AnyObject?, "", true)
                }else{
                    completion(nil, "", false)
                }
            }

        }else {
            Alamofire.request(urlString).responseJSON { (response) in

                if response.result.isSuccess{
                    completion(response.result.value as AnyObject?, "", true)
                }else{
                    completion(nil, "", false)
                }
            }
        }
    }



    //Mark:-Cancel
    class func cancelAllRequests()
    {
        Alamofire.SessionManager.default.session.getTasksWithCompletionHandler { dataTasks, uploadTasks, downloadTasks in
            dataTasks.forEach { $0.cancel() }
            uploadTasks.forEach { $0.cancel() }
            downloadTasks.forEach { $0.cancel() }
        }
    }
}

In swift 3.3 e 4. Ho creato la classe APIManager con due metodi pubblici. Basta passare il parametro richiesto, il nome api e il tipo di richiesta. Riceverai una risposta quindi passala alla chiusura.

 import UIKit   

    struct RequestType {
      static let  POST = "POST"
      static let  GET = "GET"
    }

    enum HtttpType: String {
      case POST = "POST"
      case GET  = "GET"
    }

    class APIManager: NSObject {


      static let sharedInstance: APIManager = {

        let instance = APIManager()
        return instance
      }()
     private init() {}
        // First Method

          public func requestApiWithDictParam(dictParam: Dictionary<String,Any>, apiName: String,requestType: String, isAddCookie: Bool, completionHendler:@escaping (_ response:Dictionary<String,AnyObject>?, _ error: NSError?, _ success: Bool)-> Void) {

            var apiUrl = “” // Your api url
            apiUrl =  apiUrl.appendingFormat("%@", apiName)
            let config = URLSessionConfiguration.default
            let session = URLSession(configuration: config)
            let url = URL(string: apiUrl)!
            let HTTPHeaderField_ContentType  = "Content-Type"
            let ContentType_ApplicationJson  = "application/json"
            var request = URLRequest.init(url: url)

            request.timeoutInterval = 60.0
            request.cachePolicy = URLRequest.CachePolicy.reloadIgnoringLocalCacheData
            request.addValue(ContentType_ApplicationJson, forHTTPHeaderField: HTTPHeaderField_ContentType)
            request.httpMethod = requestType

            print(apiUrl)
            print(dictParam)

            let dataTask = session.dataTask(with: request) { (data, response, error) in

              if error != nil   {
                completionHendler(nil, error as NSError?, false)
              } do {
                let resultJson = try JSONSerialization.jsonObject(with: data!, options: []) as? [String:AnyObject]
                print("Request API = ", apiUrl)
                print("API Response = ",resultJson ?? "")
                completionHendler(resultJson, nil, true)

              } catch {
                completionHendler(nil, error as NSError?, false)
              }
            }
            dataTask.resume()
          }

           // Second Method
           public func requestApiWithUrlString(param: String, apiName: String,requestType: String, isAddCookie: Bool, completionHendler:@escaping (_ response:Dictionary<String,AnyObject>?, _ error: NSError?, _ success: Bool)-> Void ) {
                var apiUrl = "" // Your api url
                let config = URLSessionConfiguration.default
                let session = URLSession(configuration: config)            
                var request: URLRequest?

                if requestType == "GET" {

                  apiUrl =  String(format: "%@%@&%@", YourAppBaseUrl,apiName,param)
                  apiUrl = apiUrl.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!
                  print("URL=",apiUrl)

                  let url = URL(string: apiUrl)!
                  request = URLRequest.init(url: url)
                  request?.httpMethod = "GET"

                } else {

                  apiUrl =  String(format: "%@%@", YourAppBaseUrl,apiName)
                  apiUrl = apiUrl.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!
                  print("URL=",apiUrl)

                  let bodyParameterData = param.data(using: .utf8)
                  let url = URL(string: apiUrl)!

                  request = URLRequest(url: url)
                  request?.httpBody = bodyParameterData
                  request?.httpMethod = "POST"
                }

                request?.timeoutInterval = 60.0
                request?.cachePolicy = URLRequest.CachePolicy.reloadIgnoringLocalCacheData
                request?.httpShouldHandleCookies = true

                let dataTask = session.dataTask(with: request!) { (data, response, error) in

                  if error != nil {
                    completionHendler(nil, error as NSError?, false)
                  } do {
                    if data != nil  {
                      let resultJson = try JSONSerialization.jsonObject(with: data!, options: []) as? [String:AnyObject]

                      print("Request API = ", apiUrl)
                      print("API Response = ",resultJson ?? "")
                      completionHendler(resultJson, nil, true) 
                    } else  {
                      completionHendler(nil, error as NSError?, false)
                    }
                  } catch {
                    completionHendler(nil, error as NSError?, false)
                  }
                }
                dataTask.resume()
              }
    }

    // Here is example of calling Post API from any class

     let bodyParameters = String(format: "appid=%@&appversion=%@","1","1")
            APIManager.sharedInstance.requestApiWithUrlString(param: bodyParameters, apiName: "PASS_API_NAME", requestType: HtttpType.POST.rawValue, isAddCookie: false) { (dictResponse, error, success) in

                if success {
                    if let dictMessage = dictResponse?["message"] as? Dictionary<String, AnyObject> {
                // do you work
                    }

                }  else {
                    print("Something went wrong...")
                }
            }
        }


/// Or just use simple function 

func dataRequest() {
    let urlToRequest = "" // Your API url

    let url = URL(string: urlToRequest)!
    let session4 = URLSession.shared
    let request = NSMutableURLRequest(url: url)
    request.httpMethod = "POST"
    request.cachePolicy = NSURLRequest.CachePolicy.reloadIgnoringCacheData
    let paramString = "data=Hello"
    request.httpBody = paramString.data(using: String.Encoding.utf8)
    let task = session4.dataTask(with: request as URLRequest) { (data, response, error) in
      guard let _: Data = data, let _: URLResponse = response, error == nil else {
        print("*****error")
        return
      }
      if let dataString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue) {
          print("****Data: \(dataString)") //JSONSerialization
      }
    }
    task.resume()
  }

rapido 4

USA ALAMOFIRE nel nostro file pod di installazione App plz

pod "Alamofire", "~> 4.0"

Possiamo usare l'API per i dati Json - https://swapi.co/api/people/

Quindi possiamo creare una classe di networking per il nostro progetto: networkingService.swift

import Foundation
import Alamofire
typealias JSON = [String:Any]
class networkingService{
     static let shared = networkingService()
    private init() {}
    func getPeople(success successblock: @escaping (GetPeopleResponse) -> Void)
    {
    Alamofire.request("https://swapi.co/api/people/").responseJSON { response in
        guard let json = response.result.value as? JSON else {return}
       // print(json)
        do {
                let getPeopleResponse = try GetPeopleResponse(json: json)
                successblock(getPeopleResponse)
            }catch{}
    }
    }
    func getHomeWorld(homeWorldLink:String,completion: @escaping(String) ->Void){
        Alamofire.request(homeWorldLink).responseJSON {(response) in
            guard let json = response.result.value as? JSON,
            let name = json["name"] as? String
                else{return}
            completion(name)
        }
}
}

Quindi crea la classe NetworkingError.swift

import Foundation
enum networkingError : Error{
    case badNetworkigStuff

}

Quindi crea la classe Person.swift

import Foundation
struct Person {
    private let homeWorldLink : String
    let birthyear : String
    let gender : String
    let haircolor : String
    let eyecolor : String
    let height : String
    let mass : String
    let name : String
    let skincolor : String
    init?(json : JSON) {
        guard let birthyear = json["birth_year"] as? String,
        let eyecolor = json["eye_color"] as? String,
        let gender = json["gender"] as? String,
        let haircolor = json["hair_color"] as? String,
        let height = json["height"] as? String,
        let homeWorldLink = json["homeworld"] as? String,
        let mass = json["mass"] as? String,
        let name = json["name"] as? String,
        let skincolor = json["skin_color"] as? String
        else { return nil }
        self.homeWorldLink = homeWorldLink
        self.birthyear = birthyear
        self.gender = gender
        self.haircolor = haircolor
        self.eyecolor = eyecolor
        self.height = height
        self.mass = mass
        self.name = name
        self.skincolor = skincolor
    }
    func homeWorld(_ completion: @escaping (String) -> Void)  {
        networkingService.shared.getHomeWorld(homeWorldLink: homeWorldLink){ (homeWorld) in
            completion(homeWorld)
        }
    }
}

Quindi crea DetailVC.swift

import UIKit
class DetailVC: UIViewController {
    var person :Person!
    @IBOutlet var name: UILabel!
    @IBOutlet var birthyear: UILabel!
    @IBOutlet var homeworld: UILabel!
    @IBOutlet var eyeColor: UILabel!
    @IBOutlet var skinColor: UILabel!
    @IBOutlet var gender: UILabel!
    @IBOutlet var hairColor: UILabel!
    @IBOutlet var mass: UILabel!
    @IBOutlet var height: UILabel!
    override func viewDidLoad() {
        super.viewDidLoad()
       print(person)
        name.text = person.name
        birthyear.text = person.birthyear
        eyeColor.text = person.eyecolor
        gender.text = person.gender
        hairColor.text = person.haircolor
        mass.text = person.mass
        height.text = person.height
        skinColor.text = person.skincolor
        person.homeWorld{(homeWorld) in
            self.homeworld.text = homeWorld
        }
    }
}

Quindi crea la classe GetPeopleResponse.swift

import Foundation
struct GetPeopleResponse {
    let people : [Person]
    init(json :JSON) throws {
        guard let results = json["results"] as? [JSON] else { throw networkingError.badNetworkigStuff}
        let people = results.map{Person(json: $0)}.flatMap{ $0 }
        self.people = people
        }
}

Quindi la nostra classe controller di visualizzazione

import UIKit

class ViewController: UIViewController {

    @IBOutlet var tableVieww: UITableView!
    var people = [Person]()


    @IBAction func getAction(_ sender: Any)
    {
    print("GET")
        networkingService.shared.getPeople{ response in
            self.people = response.people
           self.tableVieww.reloadData()
        }
    }
    override func prepare(for segue: UIStoryboardSegue, sender: Any?)
    {
        guard segue.identifier == "peopleToDetails",
        let detailVC = segue.destination as? DetailVC,
        let person = sender as AnyObject as? Person
        else {return}
        detailVC.person = person
        }
}
    extension ViewController:UITableViewDataSource{
        func numberOfSections(in tableView: UITableView) -> Int {
            return 1
        }
        func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
            return people.count
        }
        func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
         let cell = UITableViewCell()
            cell.textLabel?.text = people[indexPath.row].name

            return cell

        }
    }
extension ViewController:UITableViewDelegate{
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        performSegue(withIdentifier: "peopleToDetails", sender: people[indexPath.row])
    }
}

Nel nostro StoryBoard

plz Connettiti con la nostra vista con un'altra usando segue con identificatore -peopleToDetails

• Usa UITableView nella nostra prima vista

• Usa UIButton per ottenere i dati

• Usa 9 etichette nel nostro DetailVc

Se stai lavorando in Swift 3, la sintassi cambia. L'esempio qui ha funzionato per me e ha una buona spiegazione dei passaggi: https://grokswift.com/simple-rest-with-swift/

Questo è il codice di quel tutorial:

let todoEndpoint: String = "https://jsonplaceholder.typicode.com/todos/1"
guard let url = URL(string: todoEndpoint) else {
  print("Error: cannot create URL")
  return
}
let urlRequest = URLRequest(url: url)

let task = session.dataTask(with: urlRequest) {
  (data, response, error) in
  // check for any errors
  guard error == nil else {
    print("error calling GET on /todos/1")
    print(error!)
    return
  }
  // make sure we got data
  guard let responseData = data else {
    print("Error: did not receive data")
    return
  }
  // parse the result as JSON, since that's what the API provides
  do {
    guard let todo = try JSONSerialization.jsonObject(with: responseData, options: [])
      as? [String: Any] else {
      print("error trying to convert data to JSON")
      return
    }
    // now we have the todo
    // let's just print it to prove we can access it
    print("The todo is: " + todo.description)

    // the todo object is a dictionary
    // so we just access the title using the "title" key
    // so check for a title and print it if we have one
    guard let todoTitle = todo["title"] as? String else {
      print("Could not get todo title from JSON")
      return
    }
    print("The title is: " + todoTitle)
  } catch  {
    print("error trying to convert data to JSON")
    return
  }
}
task.resume()

Chiamata API utilizzando la classe del modello

    let urlString = "http://--.154.--.78/------/index.php?route=api/coupon/all"

    let url = URL(string: urlString)
    var request = URLRequest(url: url!)
    request.httpMethod = "GET"

    URLSession.shared.dataTask(with:request) { (data, response, error) in
        if error != nil {
            print(error)
        } else {
            do {

                let parsedDictionaryArray = try JSONSerialization.jsonObject(with: data!) as! [String:AnyObject]
                print(parsedDictionaryArray)

                if let arry = parsedDictionaryArray["data"] as? [[String:AnyObject]] {
                for dic in arry {
                    let name = dic["name"]
                    let descriptionData = dic["description"]
                    self.modelReference.append(model(name: name as! String, descriptionStr: descriptionData as! String))
                    print(name!)
                }
                }
            } catch let error as NSError {
                print(error)
            }
        }

        }.resume()

creare una variabile e connettersi con la classe del modello

var modelReference = [model]()

creare una classe modello Nuovo -> classe rapida

import Foundation
class model : NSObject{
var name : String
var descriptionStr: String

init(name : String, descriptionStr: String)
{
    self.name = name
    self.descriptionStr = descriptionStr
}

}

quindi possiamo connetterci con i nostri oggetti di visualizzazione tabella

let cell = tableView.dequeueReusableCell(withIdentifier: "TableViewCellID")as! TableViewCell
    cell.listName.text = modelReference[indexPath.row].name

let headers = [
                "cache-control": "no-cache",
                "postman-token": "6f8a-12c6-87a1-ac0f25d6385a"
            ]

            let request = NSMutableURLRequest(url: NSURL(string: "Your url string")! as URL,
                                              cachePolicy: .useProtocolCachePolicy,
                                              timeoutInterval: 10.0)
            request.httpMethod = "GET"
            request.allHTTPHeaderFields = headers

            let session = URLSession.shared
            let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
                if error == nil && data != nil {
                    do {
                        // Convert NSData to Dictionary where keys are of type String, and values are of any type
                        let json = try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.mutableContainers) as! [String:AnyObject]
                        print(json)

                        //do your stuff

                      //  completionHandler(true)

                    } catch {
                       // completionHandler(false)
                    }
                }
                else if error != nil
                {
                    //completionHandler(false)
                }
            }).resume()
            }