iOS/Swift: mapView won't update coordinates - ios

Question

I'm having an issue with updating/refreshing the map.
The code below is from the MainViewController
let forecastConstants = ForecastConstants(apiKey: forecastAPIKey)
coordinates.latitude = latPassed
coordinates.longitude = LongPassed
if latPassed == 0 && LongPassed == 0 {
coordinates.latitude = 43.161030
coordinates.longitude = -77.610922
}
LatPassed and LongPassed are passed from another controller (LocationViewController), where a new location (Lat and Long) is entered. All Controllers are in embedded in TabBar.
In MapViewController, I have:
var coordinate = MainForecastViewController()
override func viewDidLoad() {
super.viewDidLoad()
let lat = coordinate.coordinates.latitude
let lon = coordinate.coordinates.longitude
}
mapView.delegate = self
let coord = CLLocationCoordinate2D(latitude: lat, longitude: lon)
let region = MKCoordinateRegionMakeWithDistance(coord, 1000, 1000)
mapView.setRegion(region, animated: true)
pin = AnnotationPin(title: "Load temp here", subtitle: "", coordinate: coord)
mapView.addAnnotation(pin)
mapView.selectAnnotation(pin, animated: true)
}
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
let annotationView = MKAnnotationView(annotation: pin, reuseIdentifier: "forecast")
annotationView.image = UIImage(named: "weatherMapIcon")
let transform = CGAffineTransform(scaleX: 0.1, y: 0.1)
annotationView.transform = transform
return annotationView
}
The problem is, when I enter a new location, it is updated in the main controller, but when I switch to MapViewController, the pin is still pinned to the default lat and long (43.161030, -77.610922). Am I doing this right and just need to update/refresh the mapView/Pin, or is there another approach to this?
Thanks you advance!
UPDATE:
Here is the MainViewController:
class MainViewController: UIViewController {
var latPassed = Double()
var LongPassed = Double()
// These are passed from LocationViewController
var coordinates: (latitude: Double, longitude: Double) = (43.161030,-77.610922)
// These are the default coordinates
func loadWeatherTemp() {
let forecastConstants = ForecastConstants(apiKey: forecastAPIKey)
coordinates.latitude = latPassed
coordinates.longitude = LongPassed
if latPassed == 0 && LongPassed == 0 {
coordinates.latitude = 43.161030
coordinates.longitude = -77.610922
}
forecastConstants.getForecast(latitude: coordinates.latitude, longitude: coordinates.longitude) { (currentWeather) in
if let currentWeather = currentWeather {
DispatchQueue.main.async {
// stuff
}
}
}
// more stuff
}

Answer 1

I'd prefer to have a coordinate object to have in MapViewController() and set the new coordinates from MainViewController(). I'm telling Something like below:
MapViewController.swift
var newCoordinates = CLLocationCoordinate2D() {
didSet {
let region = MKCoordinateRegionMakeWithDistance(newCoordinates, 1000, 1000)
mapView.setRegion(region, animated: true)
pin = AnnotationPin(title: "Load temp here", subtitle: "", coordinate: coord)
mapView.addAnnotation(pin)
mapView.selectAnnotation(pin, animated: true)
}
UPDATE: -
MainViewController.swift
class MainViewController: UIViewController {
var latPassed = Double()
var LongPassed = Double()
weak var mapVC = MapViewController()//this will be your mapvc which is loaded in your tabbar.
var coordinates: (latitude: Double, longitude: Double) = (43.161030,-77.610922) {
didSet {
mapVC.newCoordinates = self.coordinates // Every time you update your coordinates here, send that coordinate to MapViewController() so that it stays same.
}
}
func loadWeatherTemp() {
let forecastConstants = ForecastConstants(apiKey: forecastAPIKey)
coordinates.latitude = latPassed
coordinates.longitude = LongPassed
if latPassed == 0 && LongPassed == 0 {
coordinates.latitude = 43.161030
coordinates.longitude = -77.610922
}
forecastConstants.getForecast(latitude: coordinates.latitude, longitude: coordinates.longitude) { (currentWeather) in
if let currentWeather = currentWeather {
DispatchQueue.main.async {
// stuff
}
}
}
}
Sorry for late reply.
Hope it helps!