POO Act4 App Tab Bar Paginas 1,2,3

tabbarmain.dart

import 'package:flutter/material.dart';

void main() => runApp(LeslieApp());

class LeslieApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter calvillo',
      debugShowCheckedModeBanner: false,//Quitar                              baner
      theme: ThemeData(
        primarySwatch: Colors.brown,
      ), 
      home: PaginaInicio(),
    ); //Fin material
  } //Fin de Widget
}//Fin de clase LeslieApp herencia StatelessWidget

class PaginaInicio extends StatefulWidget {
  PaginaInicio({Key key, this.title}) : super(key:                            key);
  final String title;
  @override
  _PaginaInicioState createState() => _PaginaInicioState();
  
} //Fin clase PaginaInicio herencia StatefulWidget

class _PaginaInicioState extends State<PaginaInicio> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp( 
      home: DefaultTabController(
         length:3,
        child : Scaffold(
          appBar : AppBar(
            bottom: TabBar(
              tabs: [
                   Tab(icon:Icon(Icons.home)),
                   Tab(icon:Icon(Icons.bluetooth)),
                   Tab(icon:Icon(Icons.directions_railway)),
              ]//Fin de pestañas  
            ),//fin de TaBar 
            title: Text('Barras de pestañas leslie'), 
           ),//fin de appBar 
          body: TabBarView(  
            children : [
            Icon(Icons.home), 
            Icon(Icons.bluetooth), 
            Icon(Icons.directions_railway),
           ]//fin de niños 
          
          )//fin de TabbarView 
         )//fin andamio 
        )//fin de home 
       );//fin de materialApp 
    }// fin de widget 
  }//fin clase_PaginaInicioState herenciaState

link
https://dartpad.dev/8b61b21a6f97c5c0cfce689d26215b24