drawRouteOnMap.swift

//STEP 2: - DRAW A ROUTE ON THE MAP
    func drawRouteOnMap(route: String?) {
        guard let route = route else {return}
        guard let path = GMSPath(fromEncodedPath: route) else {return}
        self.path = path
        
        let polyline = GMSPolyline(path: path)
        polyline.strokeColor = .gray
        polyline.strokeWidth = 2
        polyline.map = mapView
        
        // (Optional) Add bounds and insets to let the route is at the center of the map
        let bounds = GMSCoordinateBounds(path: path)
        let insets = UIEdgeInsets(top: 20, left: 40, bottom: 20, right: 40)
        let camera = GMSCameraUpdate.fit(bounds, with: insets)
        mapView.animate(with: camera)
        
        //STEP 3: - ANIMATIONS
        startAnimationTimer()
    }