import 'package:flutter/material.dart';
void main()=>runApp(MyApp());
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(primarySwatch: Colors.blue),
home: MyHomePage(title: 'Flutter Demo Home Page')
);
}
}
class MyHomePage extends StatefulWidget { // _MyHomePageState 호출역할
const MyHomePage({Key? key, required this.title}) : super(key: key); //위에서 넘겨준 title을 쓰기 위해
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> { //주요 내용은 여기
int _counter = 0; //_가 붙으면 class 내부에서만 쓸 수 있음
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text(widget.title),),
body: Center( //가운데 정렬
child: Column(mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text('You have pushed the button this many times: '),
Text('$_counter', style:Theme.of(context).textTheme.headline3)
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment', //도움말
child: Icon(Icons.add)
),
);
}
void _incrementCounter() {
setState((){ //변동될 때마다 적용
_counter++;
});
}
}
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