Unable to pass arguments thro Navigator-CodePudding

Im trying to pass arguments thro Navigator.pushNamed but i get this error

type 'RouteSettings' is not a subtype of type 'String' in type cast

here is the Navigator

onTap: (){
            Navigator.pushNamed(context, "ProductDetScreen",arguments: ProductModelsvar.id);
          },

and this is where i get them in the second page

final productProviders = Provider.of<productProvider>(context);
final productId = ModalRoute.of(context)!.settings as String;
final getCurrentProduct=productProviders.findProductById(productId);

CodePudding user response：

the named routes should start with a `/'

when declaring the routes in the routes property in MaterialApp :

final Map<String, WidgetBuilder>? routes;

so you should declare routes like :

routes: {
"/ProductDetScreen": () => ProductDetScreen(),
// more routes
}

so you can use it inside your code like this :

 Navigator.pushNamed(context, "/ProductDetScreen",arguments: 
 ProductModelsvar.id);

CodePudding user response：

make sure this ProductModelsvar.id also a String.

because you cast it as String here:

final productId = ModalRoute.of(context)!.settings as String;

official documantation : link

but better avoid use ! for null-safety reason. use like below:

// set empty string if its null
final productId = (ModalRoute.of(context)?.settings ?? '') as String;

ref: link