rubywai

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void main() {
  // Set preferred orientations and system UI
  WidgetsFlutterBinding.ensureInitialized();
  SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]);
  SystemChrome.setSystemUIOverlayStyle(
    const SystemUiOverlayStyle(
      statusBarColor: Colors.transparent,

rubywai

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override

rubywai

// Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'dart:math' as math;

import 'package:flutter/foundation.dart';
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';

rubywai

import 'package:flutter/material.dart';

class CustomDoubleBorder extends OutlinedBorder {
  final double innerRadius;
  final double outerRadius;
  final BorderSide innerBorderSide;
  final BorderSide outerBorderSide;

  CustomDoubleBorder({
    this.innerRadius = 4,

rubywai

import 'package:shared_preferences/shared_preferences.dart';

class MyStorage{
  Future<SharedPreferences> _sharedPreference ()async{
    return await  SharedPreferences.getInstance();
  }
  void saveString({required String key,required String? value}) async{
    SharedPreferences sharedPreferences = await _sharedPreference();
    if(value != null) {
      sharedPreferences.setString(key, value);

rubywai

import 'package:flutter/material.dart';
import 'package:flutter_ui_lesson/screens/second_screen.dart';

class FirstScreen extends StatelessWidget {
   FirstScreen({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return  DefaultTabController(
      length: 2,
      child: Scaffold(

rubywai

import 'package:flutter/material.dart';
import 'package:flutter_ui_lesson/screens/first_screen.dart';
import 'package:flutter_ui_lesson/screens/second_screen.dart';
import 'package:flutter_ui_lesson/screens/third_screen.dart';

class MainScreen extends StatefulWidget {
  const MainScreen({Key? key}) : super(key: key);

  @override
  State<MainScreen> createState() => _MainScreenState();

rubywai

Navigator.push(context,
                MaterialPageRoute(builder: (context) =>  const SecondScreen(data: 'This is from first screen',)));
                
Navigator.pop(context,' Second screen data');                

rubywai

import 'package:flutter/material.dart';
import 'package:flutter_ui_lesson/screens/first_screen.dart';

class ThirdScreen extends StatelessWidget {
  const ThirdScreen({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Third Screen'),),

rubywai

import 'package:flutter/material.dart';
import 'package:flutter_ui_lesson/screens/third_screen.dart';

class SecondScreen extends StatelessWidget {
  const SecondScreen({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Second Screen'),),