iOS starter App on Flutter

Start_iOS.dart

import 'package:flutter/cupertino.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.



  @override
  Widget build(BuildContext context) {
    return CupertinoApp(
      debugShowCheckedModeBanner: false,
      theme: CupertinoThemeData(
        textTheme: CupertinoTextThemeData(
          navLargeTitleTextStyle: TextStyle(
            fontWeight: FontWeight.bold,
            fontSize: 70.0,
            color: CupertinoColors.darkBackgroundGray,
          )
        )
      ) ,
      home: HomeScreen(),
    );
    
   
  }
}


class HomeScreen extends StatefulWidget {
  @override
  _HomeScreenState createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> {
  @override
  Widget build(BuildContext context) {
    return CupertinoPageScaffold(
      child: Center(
        child: Text('That\'s It',
        style: CupertinoTheme.of(context).textTheme.navLargeTitleTextStyle,
        ),
      ),
    );
  }
}