Show back button instead of drawer button - flutter - flutter

Question

I have a Flutter project which uses material design, that as I go through routes the appbar will show the backbutton. Recently, I just implemented a drawer in my project, and the drawer icon overrides the back icon. I essentially want to undo this, showing the back button, for certain screens, and show the menu button for other screens, almost like when I define the drawer having a showIcon: false property? I understand this post is a similar question, but no code is shown for the question or the solution... My drawer looks like this:
return Scaffold(
//appbar is here
appBar: AppBar(
title: Text("Title"),
),
drawer: drawer,
body: _buildBody(),
);
And I define drawer here:
var drawer = Drawer(
child: ListView(
padding: EdgeInsets.zero,
children: <Widget>[
//My listTiles and UserAccountsDrawerHeader are removed for simplicity
],
),
);
Thanks for any help.

Answer 1

Short answer:
AppBar(
leading: IconButton(
onPressed: () {}, // Handle your on tap here.
icon: Icon(Icons.arrow_back_ios),
),
)
Screenshot:
Full code:
void main() => runApp(MaterialApp(home: MyPage()));
class MyPage extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: Center(
child: Column(
children: <Widget>[
ElevatedButton(
onPressed: () => Navigator.push(context, MaterialPageRoute(builder: (_) => Page1())),
child: Text("Go to Drawer Page"),
),
ElevatedButton(
onPressed: () => Navigator.push(context, MaterialPageRoute(builder: (_) => Page2())),
child: Text("Go to Back button Page"),
),
],
),
),
);
}
}
// This has drawer
class Page1 extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
drawer: Drawer(),
);
}
}
// This has back button and drawer
class Page2 extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
leading: IconButton(
icon: Icon(Icons.arrow_back),
onPressed: () => Navigator.pop(context),
),
),
drawer: Drawer(),
);
}
}

Answer 2

AppBar(
leading: Builder(
builder: (BuildContext context) {
return IconButton(
icon: const Icon(Icons.arrow_back),
onPressed: () { Navigator.pop(context); },
);
},
),
)