draw polyline between two latitude and longitude - ios

Question

I pass two lat and long for source and destination but not draw poly line between two point.always get something wrong error .below code I pass my current location in source coordinate and travel location pass in destCoordinates. I want draw poly line between sourceCoordinates to destCoordinates..
if(CLLocationManager.locationServicesEnabled()){
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.startUpdatingLocation()
}
//let sourceCoordinates = locationManager.location?.coordinate
let sourceCoordinates = CLLocationCoordinate2DMake(19.115950,72.856448)
let destCoordinates = CLLocationCoordinate2DMake(19.119670,72.853616)
let sourcePlacemark = MKPlacemark(coordinate: sourceCoordinates)
let destPlacemark = MKPlacemark(coordinate: destCoordinates)
let sourceItem = MKMapItem(placemark: sourcePlacemark)
let destItem = MKMapItem(placemark: destPlacemark)
let directionRequest = MKDirectionsRequest()
directionRequest.source=sourceItem
directionRequest.destination=destItem
directionRequest.transportType = .walking
let directions = MKDirections(request: directionRequest)
directions.calculate(completionHandler: {
response,error in
guard let response = response else{
if let error = error {
print("something wrong")
}
return
}
let route = response.routes[0]
self.upcoming_info_map.add(route.polyline,level: .aboveRoads)
let rekt = route.polyline.boundingMapRect
self.upcoming_info_map.setRegion(MKCoordinateRegionForMapRect(rekt), animated: true)
})
for draw polyline i use this function
func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
let renderer = MKPolygonRenderer(overlay:overlay)
renderer.strokeColor = UIColor.blue
renderer.lineWidth = 5.0
return renderer
}

Answer 1

use this method.takes list of locations and draw polyline
func addPolyLineToMap(googlemaplist: [CLLocation?]){
var coordinates = googlemaplist.map({ (location: CLLocation!) -> CLLocationCoordinate2D in
return location.coordinate
})
print("locatios count")
print(googlemaplist.count)
var polyline = MKPolyline(coordinates: &coordinates, count: googlemaplist.count)
DispatchQueue.main.async {
self.MapKit.add(polyline)
}
}