關於 flutter Could not find a generator for route RouteSettings

路由這塊還是需要考慮下的，用popAndPushNamed傳參的時候用了onGenerateRoute

信息也給出了route search層級，我是因為在onGenerateRoute里沒做攔截，直接return null了

Generators for routes are searched for in the following order:
1. For the "/" route, the "home" property, if non-null, is used.
2. Otherwise, the "routes" table is used, if it has an entry for the route.
3. Otherwise, onGenerateRoute is called. It should return a non-null value for any valid route not handled by "home" and "routes".
4. Finally if all else fails onUnknownRoute is called.