How do I pass Json Data from one class to another? - ios

Question

Can someone tell what could I do?
I have a class named RequestManager where i have the URLSession and inside of it, a constant where I store the Data from the server.
import Foundation
class RequestManager {
func fetchWeather(cityName: String,completionHandler: #escaping ([String]) -> Void){
let weatherURL = "https://api.openweathermap.org/data/2.5/weather?q=\(cityName)&appid=55dbb1b10e9f55181ad910227f1460ae&units=metric"
let objectURL = URL(string: weatherURL)
let task = URLSession.shared.dataTask(with: objectURL!, completionHandler: {(data,reponse,error)in
if error != nil{
print(error!)
} else{
do{
let json = try JSONDecoder().decode(CityWeatherInfo.self, from: data!)
print(json)
let saveData: WeatherModel = WeatherModel(name: json.name,
temp: json.main.temp, feelsLike: json.main.feelsLike,
tempMin: json.main.tempMin, tempMax: json.main.tempMax,
main: json.weathers[0].main, description: json.weathers[0].main)
print(saveData)
} catch{
print("error")
}
}
})
task.resume()
}
}
I run the app and get this in console when I ask for the server data:
CityWeatherInfo(name: "Paris", main: Evaluación_Autofin_México.Main(temp: 20.3, feelsLike: 18.41,
tempMin: 18.0, tempMax: 21.67), weathers: [Evaluación_Autofin_México.Weather(main: "Clouds",
description: "broken clouds")])
WeatherModel(name: "Paris", temp: 20.3, feelsLike: 18.41,
tempMin: 18.0, tempMax: 21.67, main: "Clouds", description: "Clouds")
I need to paste this info into a "WeatherViewDetailController" labels, but I can't enter to the "let saveData" from RequestManager.
class WeatherDetailViewController: UIViewController {
var weatherPresenter: WeatherDetailPresenter?
public var cityName: String?
let request = RequestManager()
#IBOutlet weak var closeButton: UIButton!
#IBOutlet weak var cityImage: UIImageView!
#IBOutlet weak var nameLabel: UILabel!
#IBOutlet weak var mainLabel: UILabel!
#IBOutlet weak var descriptionLabel: UILabel!
#IBOutlet weak var tempLabel: UILabel!
#IBOutlet weak var feelsLikeLabel: UILabel!
#IBOutlet weak var tempMinLabel: UILabel!
#IBOutlet weak var tempMaxLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
weatherPresenter = WeatherDetailPresenter(view: self)
weatherPresenter?.retriveWeatherByCity(cityName: self.cityName ?? "")
self.view.backgroundColor = UIColor(red: 56/255.0, green: 110/255.0, blue: 185/255.0, alpha: 1.0)
self.closeButton.tintColor = UIColor(red: 0/255.0, green: 20/255.0, blue: 20/255.0, alpha: 1)
}
#IBAction func closeAction(_ sender: Any) {
self.dismiss(animated: true, completion: nil)
}
}
extension WeatherDetailViewController: WeatherDetailView {
func showWeatherSuccessful() {
print("Success")
}
func showWeatherFailure() {
print("Failure")
}
}

Answer 1

Update your fetch data with completion
func fetchWeather(cityName: String,completionHandler: #escaping (WeatherModel?) -> Void){
let weatherURL = "https://api.openweathermap.org/data/2.5/weather?q=\(cityName)&appid=55dbb1b10e9f55181ad910227f1460ae&units=metric"
let objectURL = URL(string: weatherURL)
let task = URLSession.shared.dataTask(with: objectURL!, completionHandler: {(data,reponse,error)in
if error != nil{
print(error!)
} else{
do{
let json = try JSONDecoder().decode(CityWeatherInfo.self, from: data!)
print(json)
let saveData: WeatherModel = WeatherModel(name: json.name,
temp: json.main.temp, feelsLike: json.main.feelsLike,
tempMin: json.main.tempMin, tempMax: json.main.tempMax,
main: json.weathers[0].main, description: json.weathers[0].main)
print(saveData)
completionHandler(saveData)
} catch{
completionHandler(nil)
print("error")
}
}
})
task.resume()
}
How to use
class WeatherDetailViewController: UIViewController {
var weatherPresenter: WeatherDetailPresenter?
public var cityName: String?
let request = RequestManager()
override func viewDidLoad() {
super.viewDidLoad()
request.fetchWeather(cityName: "", completionHandler: { [weak self] weatherModel in
// here you get object and you can set labels
self?.tempMinLabel.text = weatherModel.tempMin
self?. tempMaxLabel.text = weatherModel.tempMax
//....
})
}
}