Почему приложение iOS зависает при первом запуске на определенном экране?

Question

У моего приложения есть экран, который использует контроллер табличного представления для отображения списка ресторанов с изображениями, я использую Alamofire и AlamofireImage.Когда я запускаю приложение в первый раз, я захожу на экран входа в систему или регистрации, он работает просто отлично, но когда я вхожу в систему, он переходит на экран списка ресторанов и зависает, не реагируя на прикосновения.Но когда я закрываю приложение и запускаю его снова, оно работает просто отлично.

вот мой код для контроллера ресторана

import UIKit
import Alamofire
import AlamofireImage
import SwiftyJSON
import Toast_Swift

class RestaurantsVC: UITableViewController {
let URL_REQUEST_RESTAURANTS = "http://wajabatonline.ly/api/restaurants"
let userDefs = UserDefaults.standard
var restaurantId:integer_t = -1

var restaurants = [RestaurantModel]()

@IBAction func btnDrawer(_ sender: UIBarButtonItem) {
    let appDelegate = UIApplication.shared.delegate as! AppDelegate
    appDelegate.drawerController.setDrawerState(.opened, animated: true)
}


override func viewDidLoad() {
    super.viewDidLoad()
    // init cart button.
    let rightBarButtonItem = UIBarButtonItem.init(image: UIImage(named: "basket"), style: .done, target: self, action: #selector(btnCart))
    self.navigationItem.rightBarButtonItem = rightBarButtonItem

}

override func viewDidAppear(_ animated: Bool) {
    // request restaurants
    requestRestaurants(token: userDefs.string(forKey: Constatnts.defaultsKeys.userToken)!, city: "Benghazi")
}

@objc func btnCart(){
    let mStoryboard = UIStoryboard(name: "Main", bundle: nil)
    let controller = mStoryboard.instantiateViewController(withIdentifier: "CartVC")
    self.present(controller, animated: true, completion: nil)
}

override func numberOfSections(in tableView: UITableView) -> Int {
    // #warning Incomplete implementation, return the number of sections
    return 1
}

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete implementation, return the number of rows
    return restaurants.count
}

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    var cell = tableView.dequeueReusableCell(withIdentifier: "restaurantCell", for: indexPath) as! RestaurantViewCell
    cell.selectionStyle = .none

    let restaurant = restaurants[indexPath.row]

    // if restaurant closed then show closed sign
    if restaurant.open == 0 {
        cell.imgDark.isHidden = false
        cell.lblClosed.isHidden = false
    } else {
        cell.imgDark.isHidden = true
        cell.lblClosed.isHidden = true
    }

    // Init and download image
    let url = URL(string: restaurant.img_url)!
    let placeholderImage = UIImage(named: "ph2")!
    let filter = AspectScaledToFillSizeFilter(
        size: cell.restaurantImgView.frame.size
    )

    cell.restaurantImgView.af_setImage(withURL: url, placeholderImage: placeholderImage, filter: filter, imageTransition: .crossDissolve(0.1))
    cell.restaurantNameLbl?.text = restaurant.name
    cell.restaurantCuisineLbl?.text = restaurant.descriptions

    return cell
}

// Get selected row
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    // if closed return
    if restaurants[indexPath.row].open == 0 {
        DispatchQueue.main.async{
            HelperFuncs.helper.showAlert("المطعم مغلق حاليا!", vc: self)
        }
        return
    }
    restaurantId = restaurants[indexPath.row].id
    performSegue(withIdentifier: "RestaurantVCSegue", sender: self)
}

// Send data with segue
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.destination is RestaurantInfoVC{
        let vc = segue.destination as? RestaurantInfoVC
        vc?.restaurantId = self.restaurantId
    }
}

func goToScreen() {
    let wajabatStoryBoard = self.storyboard
    guard let dVC = wajabatStoryBoard?.instantiateViewController(withIdentifier: "RestaurantInfoVC") as? RestaurantInfoVC
        else {
            print("No ctrl found")
            return
    }
    self.navigationController?.pushViewController(dVC, animated: true)
}

func requestRestaurants(token:String, city:String) {
    HelperFuncs.helper.showActivityIndicator(vc: self)

    // 1- creating parameters for the post request
    let parameters: Parameters=[
        "src": "mobile",
        "token": token,
        "city": city
        ]

    // 2- Sending http post request
    Alamofire.request(URL_REQUEST_RESTAURANTS, method: .post, parameters: parameters).responseJSON {  response in

        switch response.result {
        case .success(let value):
            let jsonResponse = JSON(value)

            // Check if status = success
            if jsonResponse["status"] == "success" {
                // Map array of restaurants to restaurants objects
                let restaurantsList = jsonResponse["restaurants"].arrayValue

                // reset restaurants array to 0, if come from view did appear do not duplicate
                self.restaurants.removeAll()

                // Loop through each restaurant element in the array of json
                for restaurant in restaurantsList {
                    self.restaurants.append(RestaurantModel(id: restaurant["id"].int32Value, img_url: restaurant["img_url"].stringValue, name: restaurant["name"].stringValue, descriptions: restaurant["description"].stringValue, delivery_fee: restaurant["delivery_fee"].floatValue, city: restaurant["city"].stringValue, note: restaurant["delivery_fee"].stringValue, lat: restaurant["delivery_fee"].doubleValue, lng: restaurant["delivery_fee"].doubleValue, leastPrice: restaurant["note"].floatValue, commission: restaurant["commission"].floatValue, open: restaurant["open"].int32Value, enabled: restaurant["enabled"].int32Value))
                }

                self.tableRefresh()
                HelperFuncs.helper.hideActivityIndicator(vc: self)
            } else {
                HelperFuncs.helper.hideActivityIndicator(vc: self)
                HelperFuncs.helper.showToast(jsonResponse["message"].stringValue, self)
                if jsonResponse["message"].stringValue.starts(with: "i") {
                    HelperFuncs.helper.setLoggedoutDefs()
                }
            }

        case .failure( _):
            HelperFuncs.helper.hideActivityIndicator(vc: self)
            HelperFuncs.helper.showToast("خطأ في الشبكة!", self)
            self.networkAlert()
        }

    }
}

func tableRefresh(){
    DispatchQueue.main.async {
        self.tableView.reloadData()
    }
}

// alert with action
func networkAlert() {
    let alert = UIAlertController(title: "لا يوجد اتصال", message: nil, preferredStyle: .alert)
    // Main Actions
    alert.addAction(UIAlertAction(title: "اعادة التحميل", style: .default, handler: { (action) -> Void in
        self.requestRestaurants(token: self.userDefs.string(forKey: Constatnts.defaultsKeys.userToken)!, city: "Benghazi")
    }))
    // show alert
    self.present(alert, animated: true)
}

@IBAction func unwindToRestaurants(_ sender: UIStoryboardSegue){

}

}

И я показываю экран ресторана с библиотекой выдвижных ящиков изпредыдущий контроллер по этому коду:

// Init Drawer
    let appDelegate = UIApplication.shared.delegate as! AppDelegate

    let storyBoard = UIStoryboard.init(name: "Main", bundle: Bundle.main)

    let navVC = storyBoard.instantiateViewController(withIdentifier: "NavVC")  // is the main controller for the drawer.
    let drawerVC = storyBoard.instantiateViewController(withIdentifier: "DrawerVC")  // is the drawer, and the drawer needs a main controller

    appDelegate.drawerController.mainViewController = navVC
    appDelegate.drawerController.drawerViewController = drawerVC

    appDelegate.window?.rootViewController = appDelegate.drawerController
    appDelegate.window?.makeKeyAndVisible()

Это проблема основного потока?