change color icon tabbar flutter

Icon(
  Icons.widgets,
  color: Colors.blue.shade400,
)

   appBar: AppBar(
      title: const Text('Example'),
      backgroundColor: Colors.black,
    ),

appBar: AppBar(
        brightness: Brightness.dark,
        iconTheme: IconThemeData(color: Colors.white),
        title: Text("Title TabBar"),
)