20 Flutter: IconButton

main.dart
import 'package:flutter/material.dart';
void main(){
runApp(new MaterialApp(
home: new MyApp(),
));
}
class MyApp extends StatefulWidget {
_State createState() => new _State();
}
//State is information of the application that can change over time or when some actions are taken.
class _State extends State<MyApp>{
int _value = 0;
void _add() {
setState(() {
_value++;
});
}
void _subtract() {
setState(() {
_value--;
});
}
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('Name here'),
),
//hit Ctrl+space in intellij to know what are the options you can use in flutter widgets
body: new Container(
padding: new EdgeInsets.all(32.0),
child: new Center(
child: new Column(
children: <Widget>[
new Text('Value = ${_value}'),
new IconButton(icon: new Icon(Icons.add), onPressed: _add),
new IconButton(icon: new Icon(Icons.remove), onPressed: _subtract),
],
),
),
),
);
}
}