Swift 3 Current Location to Simple location between MKPolyline - swift

Question

Hello i have working codes for current location blue dot show and simple location pin show I want to do line between them with MKPolyline my clear codes under below.
import UIKit
import CoreLocation
import MapKit
class ShowMapViewController: UIViewController,MKMapViewDelegate ,CLLocationManagerDelegate {
#IBOutlet weak var mapView: MKMapView!
var showmapListcomming = String()
let locationManager = CLLocationManager()
override func viewDidLoad() {
super.viewDidLoad()
locationManager.delegate = self
locationManager.requestLocation()
locationManager.requestWhenInUseAuthorization()
locationManager.requestAlwaysAuthorization()
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.startUpdatingLocation()
mapView.showsUserLocation = true
// Show Map
var myStringArrctakes = showmapListcomming.components(separatedBy: ",")
let annotation = MKPointAnnotation()
let latitude:CLLocationDegrees = (myStringArrctakes[6] as NSString).doubleValue
let longitude:CLLocationDegrees = (myStringArrctakes[5] as NSString).doubleValue
let latDelta:CLLocationDegrees = 30
let lonDelta:CLLocationDegrees = 30
let span:MKCoordinateSpan = MKCoordinateSpanMake(latDelta, lonDelta)
let locations:CLLocationCoordinate2D = CLLocationCoordinate2DMake(latitude, longitude)
let region:MKCoordinateRegion = MKCoordinateRegionMake(locations, span)
mapView.setRegion(region, animated: false)
annotation.coordinate = locations
annotation.title = myStringArrctakes[1]
annotation.subtitle = "\(myStringArrctakes[2])"
mapView.addAnnotation(annotation)
}
// MARK: - MKMapViewDelegate methods
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
let annotationView = MKPinAnnotationView()
return annotationView
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let location = locations.last
let center = CLLocationCoordinate2D(latitude: location!.coordinate.latitude, longitude: location!.coordinate.longitude)
let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01))
self.mapView.setRegion(region, animated: true)
if let location = locations.last {
print("Found User's location: \(location)")
print("Latitude: \(location.coordinate.latitude) Longitude: \(location.coordinate.longitude)")
}
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: NSError) {
print("Failed to find user's location: \(error.localizedDescription)")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
I think easy but I didn't resolve it. Im waiting your ideas , I think will be help many people so in swift 3 I didn't find anything like this on web.
Thanks