DART

flutter appbar trailing icon

appBar: AppBar(
  title: Text('Hello'),
  actions: [
    IconButton(
      icon: Icon(Icons.settings),
      onPressed: () {},
    ),
    // add more IconButton
  ],
),

flutter appbar leading icon

appBar: AppBar(
	title: Text('AppBar'),
    leading: IconButton(icon: Icon(Icons.arrow_back)), // appbar leading icon.
   ),