title: How can I draw 2 MKPolyline on MKMapView with different strokes/color?
body: <p>I have a MKMapView where I'm tracking the path of the user(it's a running app), but the requirement is create a line with two colors. One for the center of the stroke, and other for the border of the stroke. For this, I'm implementing the method func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer of the UIViewController class, in order to return the renderer.</p>
  
  <p>I'm using Swift 4</p>
  
  <p>Any ideas?</p>
  
  <p>Thanks in advance.</p>