UI won't update after getting json data from Openweathermap IOS 4 Xcode 10 - ios

Question

my JSON have been printed to console with the correct value request. but label.text and city.text won't update UI in main controller
#IBOutlet weak var icon: UIImageView!
#IBOutlet weak var date: UILabel!
#IBOutlet weak var weatherType: UILabel!
#IBOutlet weak var degree: UILabel!
#IBOutlet weak var city: UILabel!
var currentWeather : CurrentWeather!
override func viewDidLoad() {
super.viewDidLoad()
currentWeather = CurrentWeather()
}
override func viewDidAppear(_ animated: Bool) {
super .viewDidAppear(animated)
locationAuthStatus()
}
func locationAuthStatus() {
if CLLocationManager.authorizationStatus() == .authorizedWhenInUse {
currentLocaion = locationManager.location
//Location.sharedIntance.latitude = currentLocaion.coordinate.latitude
//Location.sharedIntance.longitude = currentLocaion.coordinate.longitude
print(currentLocaion)
currentWeather.downloadWeatherDetail {
downloadForecastData {
self.updateMainUI()
}
}
} else {
locationManager.requestWhenInUseAuthorization()
locationAuthStatus()
}
}
func updateMainUI() {
icon.image = UIImage(named: currentWeather.weatherType)
city.text = currentWeather.cityName
degree.text = "\(currentWeather.currentTemp)"
weatherType.text = currentWeather.weatherType
date.text = currentWeather.date
}
}
I am new to coding and 'm having a hard figuring out why isn't it showing since I confirmed that I am pulling data from Json to my console

Answer 1

These lines won't do what you expect.
locationManager.requestWhenInUseAuthorization()
locationAuthStatus()
Your call to requestWhenInUseAuthorization is asynchronous and should be handled by a CLLocationManagerDelegate which can be your view controller. You can do this like this:
class ViewController: UITableViewController, CLLocationManagerDelegate {
// rest of class
Add these functions to your class
func locationManager(_ manager: CLLocationManager, didUpdateLocations objects: [CLLocation]) {
let location = objects[objects.count-1]
let currentLocation = location
print(currentLocation)
currentWeather.downloadWeatherDetail {
downloadForecastData {
self.updateMainUI()
}
}
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
// handle error
}
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
locationManager.startUpdatingLocation()
}