OnBoardingScreen

https://github.com/icodingchef/onboarding_lecture

main.dart

mport 'package:flutter/material.dart';

import 'onboarding.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      debugShowCheckedModeBanner: false,
      home: OnBoardingPage(),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text(
            'Main page'), // 한번 정해지면 바뀌지 않는 데이터를 사용하는 위젯 앞에는 const를 붙이도록 한다.
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            const Text(
              'Main Screen',
              style: TextStyle(
                fontWeight: FontWeight.bold,
                fontSize: 25,
              ),
            ),
            ElevatedButton(
              onPressed: (){
                Navigator.of(context).pushReplacement(
                  MaterialPageRoute(
                    builder: (context) => const OnBoardingPage(),
                  ),
                );
              },
              child: const Text('Go to onboarding screen'),
            ),
          ],
        ),
      ),
    );
  }
}

onboarding.dart

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

import 'main.dart';

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

  @override
  Widget build(BuildContext context) {
    return IntroductionScreen(
      pages: [
        // 대부분의 온보딩 스크린은 여러 페이지로 구성되어 있기 때문에, 칼럼 위젯처럼 pages 알규먼트는 리스트를 불러와야 한다.
        PageViewModel(
          title: 'Welcome to my app',
          body: 'This is the fist page',
          image: Image.asset('image/page1.png'),
          decoration: getPageDecoration(),
        ),
        PageViewModel(
          title: 'Welcome to my app',
          body: 'This is the second page'
              'We are making on-boarding screens.'
              'It is very interesting ',
          image: Image.asset('image/page2.png'),
          decoration: getPageDecoration(),
        ),
        PageViewModel(
          title: 'Welcome to my app',
          body: 'This is the third page'
              'We are making on-boarding screens.'
              'It is very interesting',
          image: Image.asset('image/page3.png'),
          decoration: getPageDecoration(),
        ),
      ],
      done: const Text('done'), // 온보딩 스크린을 마지막까지 보았을 때, 무엇을 할 지 지정해주는 버튼
      onDone: () {
        Navigator.of(context).pushReplacement(
          MaterialPageRoute(
            builder: (context) => const MyPage(),
          ),
        );
      }, // 버튼이 터치가 되면 무엇을 할 지 지정, onPressed와 유사
      next: const Icon(Icons.arrow_forward),
      showSkipButton: true,
      skip: const Text('skip'),
      dotsDecorator: DotsDecorator(
        color: Colors.cyan,
        size: const Size(10,10),
        activeSize: const Size(22,10),
        activeShape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(24),
        ),
        activeColor: Colors.red,
      ),
      curve: Curves.bounceOut,
    );
  }

  PageDecoration getPageDecoration() {
    return const PageDecoration(
      titleTextStyle: TextStyle(
        fontSize: 28,
        fontWeight: FontWeight.bold,
      ),
      bodyTextStyle: TextStyle(
        fontSize: 18,
        color: Colors.blue,
      ),
      imagePadding: EdgeInsets.only(top: 40),
      pageColor: Colors.orange,
    );
  }
}