title: Remove marker on click in swift
body: <p>i tried to add marker on click and i did it !
  but i want to have just 2 marker in google maps.
  what should i do ?! 
  here is my code in swift </p>
  
  <pre><code>    mapView.delegate = self
  
      }
  
  func mapView(mapView: GMSMapView, didTapAtCoordinate coordinate: CLLocationCoordinate2D) {
  
      let marker = GMSMarker(position: coordinate)
      marker.appearAnimation = kGMSMarkerAnimationPop
      marker.title = ""
      marker.snippet = ""
      marker.map = mapView   
  }
  </code></pre>
  
  <p>i want to have a marker for home and a marker for destination</p>