NavigatorObserver didpop执行的时候，怎么用dispatch执行一个action?

[koalababy2024]

class CusomObserver extends NavigatorObserver{

  @override
  void didPop(Route<dynamic> route, Route<dynamic> previousRoute) {
    print("*****************");
    print(route);
    print("*****************");
    print(route.navigator.context);
    print("*****************");
    print(route.settings.name);

    if ("vehicle_manager" == route.settings.name){
      PageRoutes pageRoutes = routes as PageRoutes;

      Page page = pageRoutes.pages[route.settings.name];
      page as VehicleManagerPage   //这里想要获取到了具体的page

    }

    print("*****************");
  }
}

怎么执行这个page内effect中的一个action呢？