JSON Exresice

//-----  CityWeatherTableViewController.swift --------
import UIKit

class CityWeatherTableViewController: UITableViewController {

    @IBOutlet weak var weatherDataTableView: UITableView!

    let cellReuseIdentifier = "CityPropCellReuseIdentifier"
    let citiesList: [String] = ["Holon", "Paris", "London", "Malaga", "Madrid", "Zanzibar", "Istanbul", "Roma", "Berlin", "Moscow"]

    struct position {
        var city: String
        var description: String
        var temp: String
        var humidity: String
        var windSpeed: String
    }
    let myAPIkey:String = "e726b53e902ebe807d746eb96ffc01b7"
    var citiesProps:[position] = []

    var myURL:String = ""

    override func viewDidLoad() {
        super.viewDidLoad()
        title = "City Weather"
        navigationController?.navigationBar.prefersLargeTitles = true
        setDelegates()
        getCitiesWeatherProps()
    }

    fileprivate func getCitiesWeatherProps() {
        for city in citiesList {
            getCityWeatherData(city: city)
        }
        print(citiesProps)
    }

    fileprivate func getCityWeatherData(city: String) {
        myURL = "https://api.openweathermap.org/data/2.5/weather?q=\(city)&appid=\(myAPIkey)"
        //convert our string to URL
         let url = URL(string: myURL)!
        var newPos: position?
         //create a url async task
         URLSession.shared.dataTask(with: url){
             (data,response,error) in
             //check  if we  not have error, and if we have, print the error
             if error != nil {
                 let myError = error! as NSError
                 print (myError)
             } else {
                 do {
                    let parseData = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? [String:Any]
                    let currentWeather = parseData!["weather"] as! NSArray
                    let currentWeatherData = currentWeather[0] as! [String:Any]
                    let currentDescription = currentWeatherData["description"]  as! String
                    let currentMainData = parseData!["main"] as! [String:Any]
                    var currentTemperature = currentMainData["temp"]  as! Double
                    let currentHumidity = ((currentMainData["humidity"]  as! Double) * 1000).rounded(.toNearestOrEven) / 1000
                    let currentWindData = parseData!["wind"] as! [String:Any]
                    let currentWindSpeed = ((currentWindData["speed"]  as! Double) * 1000).rounded(.toNearestOrEven) / 1000
                    newPos = position(city: city, description: currentDescription, temp: String(currentTemperature.f2c()), humidity: String(currentHumidity), windSpeed: String(currentWindSpeed))
                    print(newPos!)
                    print("a")
                    self.citiesProps.append(newPos!)
                    DispatchQueue.main.async {
                        self.weatherDataTableView.reloadData()
                    }
                 } catch let error as NSError {
                     print (error)
                 }
             }
         }.resume()
    }

    fileprivate func setDelegates() {
        weatherDataTableView.delegate = self
        weatherDataTableView.dataSource = self
    }

    // MARK: - Table view data source

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return citiesProps.count
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: cellReuseIdentifier, for: indexPath) as! WeatherInfoTableViewCell
        print(9)
        cell.cityNameLabel.text = citiesProps[indexPath.row].city
        cell.humidityLabel.text = citiesProps[indexPath.row].humidity
        cell.tempLabel.text = citiesProps[indexPath.row].temp
        cell.weatherDescriptionLabel.text = citiesProps[indexPath.row].description
        cell.windSpeedLabel.text = citiesProps[indexPath.row].windSpeed
        switch citiesProps[indexPath.row].description {
        case "broken clouds":
            cell.backgroundColor = .systemGray
        case "scattered clouds":
            cell.backgroundColor = .systemGray2
        case "overcast clouds":
            cell.backgroundColor = .systemGray3
        case "light rain":
            cell.backgroundColor = .systemBlue
        case "clear sky":
            cell.backgroundColor = .systemTeal
        default:
            cell.backgroundColor = .systemPink
        }
        return cell
    }

    override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return 200
    }

}

extension Double{
    mutating func f2c() -> Double{
        var x: Double
        x = (5000*(self-32))/9
        return x.rounded(.toNearestOrEven) / 1000
    }
}

// ----------- WeatherInfoTableViewCell.swift --------

import UIKit

class WeatherInfoTableViewCell: UITableViewCell {

    @IBOutlet var cityNameLabel: UILabel! = UILabel()
    @IBOutlet var weatherDescriptionLabel: UILabel! = UILabel()
    @IBOutlet var tempLabel: UILabel! = UILabel()
    @IBOutlet var humidityLabel: UILabel! = UILabel()
    @IBOutlet var windSpeedLabel: UILabel! = UILabel()

    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }

    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)

        // Configure the view for the selected state
    }

}