how to work initial state flutter tabbar view code example

Example 1: tab design in flutter

DefaultTabController(      length: 3,      child: Scaffold(        appBar: AppBar(          backgroundColor: Colors.white,          elevation: 0,          bottom: TabBar(              unselectedLabelColor: Colors.redAccent,              indicatorSize: TabBarIndicatorSize.label,              indicator: BoxDecoration(                  borderRadius: BorderRadius.circular(50),                  color: Colors.redAccent),              tabs: [                Tab(                  child: Container(                    decoration: BoxDecoration(                        borderRadius: BorderRadius.circular(50),                        border: Border.all(color: Colors.redAccent, width: 1)),                    child: Align(                      alignment: Alignment.center,                      child: Text("APPS"),                    ),                  ),                ),                Tab(                  child: Container(                    decoration: BoxDecoration(                        borderRadius: BorderRadius.circular(50),                        border: Border.all(color: Colors.redAccent, width: 1)),                    child: Align(                      alignment: Alignment.center,                      child: Text("MOVIES"),                    ),                  ),                ),                Tab(                  child: Container(                    decoration: BoxDecoration(                        borderRadius: BorderRadius.circular(50),                        border: Border.all(color: Colors.redAccent, width: 1)),                    child: Align(                      alignment: Alignment.center,                      child: Text("GAMES"),                    ),                  ),                ),              ]),        ),        body: TabBarView(children: [          Icon(Icons.apps),          Icon(Icons.movie),          Icon(Icons.games),        ]),      ))

Example 2: tab design in flutter

DefaultTabController(        length: 3,        child: Scaffold(          appBar: AppBar(            backgroundColor: Colors.redAccent,            elevation: 0,            bottom: TabBar(                labelColor: Colors.redAccent,                unselectedLabelColor: Colors.white,                indicatorSize: TabBarIndicatorSize.label,                indicator: BoxDecoration(                    borderRadius: BorderRadius.only(                        topLeft: Radius.circular(10),                        topRight: Radius.circular(10)),                    color: Colors.white),                tabs: [                  Tab(                    child: Align(                      alignment: Alignment.center,                      child: Text("APPS"),                    ),                  ),                  Tab(                    child: Align(                      alignment: Alignment.center,                      child: Text("MOVIES"),                    ),                  ),                  Tab(                    child: Align(                      alignment: Alignment.center,                      child: Text("GAMES"),                    ),                  ),                ]            ),          ),          body: TabBarView(children: [            Icon(Icons.apps),            Icon(Icons.movie),            Icon(Icons.games),          ]),        )     )

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