flutter 原生路由封装 onGenerateRoute

import 'package:flutter/material.dart';
Map<String, WidgetBuilder> router= {
    '/':(context)=>Container(child:Text("sye"),)
  };

RouteFactory onGenerateRoute=(RouteSettings settings){
  final String? name = settings.name;
  final Function pageContentBuilder = router[name] as Function;
  if (pageContentBuilder != null) {
    if (settings.arguments != null) {
      final Route route = MaterialPageRoute(
          builder: (context) =>
              pageContentBuilder(context, arguments: settings.arguments));
      return route;
    } else {
      final Route route = MaterialPageRoute(builder: (context) => pageContentBuilder(context));
      return route;
    }
  }
};