在GoogleMap上显示交通详情

Question

我想总是在谷歌地图上显示交通细节，我搜索了很多，我找到的唯一解决方案是。 设置为isTrafficEnabled GMSMapView属性的true。但它不起作用，我的地图视图不显示交通细节。 有我的代码show MapView，有人知道问题出在哪里了吗？

fileprivate func initMapView() {

    mapView.animate(toLocation: CLLocationCoordinate2D(latitude: originlocationlan,longitude: originlocationlng))
    mapView.animate(toZoom: 20)
    self.mapView.delegate = self
    mapView.mapType = .normal
    mapView.isTrafficEnabled = true
    mapView.settings.zoomGestures = true
    mapView.settings.rotateGestures = true
  }
  override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {

    if !didFindMyLocation {
      print("if allow access to location")
      let mylocation : CLLocation = change![NSKeyValueChangeKey.newKey] as! CLLocation

      myLat = mylocation.coordinate.latitude
      myLon = mylocation.coordinate.longitude

      mapView.camera = GMSCameraPosition.camera(withTarget: mylocation.coordinate, zoom: 15.0)
      registerGetAddressForCenterCoordinateOfMap(lat: mylocation.coordinate.latitude, lng: mylocation.coordinate.longitude)
      mapView.animate(toZoom: 15.0)
      mapView.settings.myLocationButton = true
      mapView.settings.allowScrollGesturesDuringRotateOrZoom = true
      mapView.settings.indoorPicker = true
      didFindMyLocation = true
    }

  }