You can checkout this tutorial for the explanation but the code from the tutorial is:
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return CupertinoApp(
title: 'Flutter Demo',
home: HomePage(),
);
}
}
class HomePage extends StatelessWidget{
@override
Widget build(BuildContext context) {
return CupertinoPageScaffold(
child: NestedScrollView(
headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled){
return <Widget>[
CupertinoSliverNavigationBar(
largeTitle: Text('Settings'),
)
];
},
body: Center(child: Text('Home Page'),),
),
);
}
}
This code makes a large text an appbar with a large title like the following image:
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