Draw rout using mapkit Swift 

mapView(mapView:rendererForOverlay)
rendererForOverlay(overlay:)  
 
func mapView(mapView: MKMapView!, rendererForOverlay overlay:  
MKOverlay!) -> MKOverlayRenderer! {
    println("rendererForOverlay");

    if (overlay is MKPolyline) {
        var pr = MKPolylineRenderer(overlay: overlay);
        pr.strokeColor = UIColor.blueColor().colorWithAlphaComponent(0.5);
        pr.lineWidth = 5;
        return pr;
    }

    return nil
}

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