POO Act5 bottomNavigationBar

Navigatorbar.dart

import 'package:flutter/material.dart'; 
  
void main() => runApp(KevinApp()); 
  
class KevinApp extends StatelessWidget { 
  @override 
  Widget build(BuildContext context) { 
    return MaterialApp( 
      title: 'Flutter Demo', 
      debugShowCheckedModeBanner: false, // quitar baner 
      theme: ThemeData( 
        primarySwatch: Colors.purple, 
      ), 
      home: PaginaInicio(), 
    ); // fin de material 
  } // fin de widget 
}// fin de clase KevinApp herencia StatelessWidget 
  
final img1 ="https://raw.githubusercontent.com/"+"Jorgeluis190260363-6/Mis-imagenes/main/iron%20man.jpg"; 
final img2 ="https://raw.githubusercontent.com/"+"Jorgeluis190260363-6/Mis-imagenes/main/hulk.jpg"; 
final img3 ="https://raw.githubusercontent.com/"+"Jorgeluis190260363-6/Mis-imagenes/main/capitan%20america.jpg"; 
  
class Tab1 extends StatelessWidget { 
  @override 
  Widget build(BuildContext context) { 
    return Image.network(img1); 
  } //fin de widget 
} // fin clase Tab1 herencia StatelessWidget 
  
class Tab2 extends StatelessWidget { 
  @override 
  Widget build(BuildContext context) { 
    return Image.network(img2); 
  } //fin de widget 
} // fin clase Tab1 herencia StatelessWidget 
  

class Tab3 extends StatelessWidget { 
  @override 
  Widget build(BuildContext context) { 
    return Image.network(img3); 
  } //fin de widget 
} // fin clase Tab1 herencia StatelessWidget 
  
class PaginaInicio extends StatelessWidget{ 
  @override 
  Widget build(BuildContext context) { 
  return DefaultTabController( 
    length: 3, 
     child: new Scaffold( 
        appBar: AppBar( 
         title: new Text("Nueva Pestañas Vengadores") 
        ),  
      body: TabBarView( 
      children: <Widget>[Tab1(), Tab2(), Tab3()], 
         ),// fin body 
        
      bottomNavigationBar: Container( 
                child: TabBar( 
                 labelColor: Colors.grey, 
                 unselectedLabelColor: Colors.purple, 
                 labelStyle: TextStyle( 
                 color: Colors.grey, fontWeight: 
                 FontWeight.w800), 
                 indicatorColor: Colors.purple, 
                 tabs: <Widget>[ 
 Tab(text: 'Cat #1', icon:Icon(Icons.keyboard_arrow_left)), 
 Tab(text: 'Cat #2', icon:Icon(Icons.keyboard_arrow_up)), 
 Tab(text: 'Cat #3', icon:Icon(Icons.keyboard_arrow_right)) 
                ])) // fin de contenedor   navigator bar  
        
        
       )// fin de andamio 
    ); // fin controlador 
  }// fin de widget 
}// fin class PaginaInicio herencia StatelessWidget 
   

Link codigo funcionando ----> https://dartpad.dev/72c33e44d4e59e2076fee179a08de1da