How to get directions from user location to another specific location? - ios

Question

I have 2 locations in the map. First one is users current location with blue dot placemark and the second one is specified restaurant location near of the users current location with red dot placemark. I want to get directions from user's current location to restaurant location. I am getting directions when I define latitude and longitude values like latitude: 38.00001 and longitude: 27.08980.
Also I am getting each restaurants location from api to red dot placemark but do not get directions from user current location to restaurant location.
I am getting restaurant location with these codes:
var viewModel: DetailsViewModel? {
didSet {
updateView()
}
willSet {
updateView()
}
}
func updateView() {
if let viewModel = viewModel {
detailsFoodView?.priceLabel?.text = viewModel.price
detailsFoodView?.hoursLabel?.text = viewModel.isOpen
detailsFoodView?.locationLabel?.text = viewModel.phoneNumber
detailsFoodView?.ratingsLabel?.text = viewModel.rating
detailsFoodView?.collectionView?.reloadData()
centerMap(for: viewModel.coordinate)
print("detail restaurant destination : \(viewModel.coordinate)")
title = viewModel.name
print("title: \(title)")
}
}
func centerMap(for coordinate: CLLocationCoordinate2D) {
let region = MKCoordinateRegion(center: coordinate, latitudinalMeters: 100, longitudinalMeters: 100)
let annotation = MKPointAnnotation()
annotation.coordinate = coordinate
detailsFoodView?.mapView?.addAnnotation(annotation)
detailsFoodView?.mapView?.setRegion(region, animated: true)
}
}
And in viewDidLoad() getting directions like:
let sourceCoordinates = locationManager.location?.coordinate
Problem is here
I do not get each restaurant's latitude and longitude values to destCoordinates. Normally, I get with viewModel.coordinate.
But if I use
let destCoordinates = CLLocationCoordinate2D(latitude: viewModel?.coordinate.latitude, longitude: viewModel?.coordinate.longitude)
Instead of:
let destCoordinates = CLLocationCoordinate2D(latitude: 38.420183, longitude: 27.205559)
I am getting latitude and longitude values nil or zero.
let sourcePlaceMark = MKPlacemark(coordinate: sourceCoordinates!)
let destPlaceMark = MKPlacemark(coordinate: destCoordinates)
let sourceItem = MKMapItem(placemark: sourcePlaceMark)
let destItem = MKMapItem(placemark: destPlaceMark)
let directionRequest = MKDirections.Request()
directionRequest.source = sourceItem
directionRequest.destination = destItem
directionRequest.transportType = .automobile
let directions = MKDirections(request: directionRequest)
directions.calculate(completionHandler: {response, error in
guard let response = response else {
if error != nil {
print("Something went wrong!")
}
return
}
let route = response.routes[0]
self.detailsFoodView?.mapView?.addOverlay(route.polyline, level: .aboveRoads)
let rect = route.polyline.boundingMapRect
self.detailsFoodView?.mapView?.setRegion(MKCoordinateRegion(rect), animated: true)
Expected result is current user place as blue dot placemark to red dot placemark with red line as you can see in the screen shot.
Image: