build the tabbar view

main.dart

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        title: _title,
        home: DefaultTabController(
            length: createTabs().length,
            child: Builder(builder: (BuildContext context) {
              return Scaffold(
                appBar: AppBar(
                  title: const Text(_title),
                  centerTitle: true,
                  bottom: TabBar(
                    tabs: createTabs(),
                  ),
                ),
                body: TabBarView(
                  children: generateTabColumns(),
                ),
              );
            })));
  }