(코딩쉐프) 17~18강 BuildContext, Snack bar

 

BuildContext개념은 강좌 확인

 

변경된 사용법

onPressed: () {
  ScaffoldMessenger.of(context)
      .showSnackBar(SnackBar(content: Text('Hello')));
}),

참고

https://yj95.tistory.com/364

 

import 'package:flutter/material.dart';

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

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

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: MyPage(),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text('Snack Bar'),
          centerTitle: true,
        ),
        body: Center(
          child: TextButton(
              child: Text(
                'show Me',
                style: TextStyle(
                  color: Colors.white,
                  backgroundColor: Colors.red,
                ),
              ),
              onPressed: () {
                ScaffoldMessenger.of(context).showSnackBar(SnackBar(
                    backgroundColor: Colors.teal,
                    duration: Duration(milliseconds: 1000),
                    content: Text(
                      'Hello',
                      textAlign: TextAlign.center,
                      style: TextStyle(color: Colors.white),
                    )));
              }),
        ));
  }
}