第18章异步编程bloc自定义状态管理示例main

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//stream_bloc_main.dart文件
import 'package:flutter/material.dart';
import 'blocs/bloc_counter.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Bloc示例',
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => _MyHomePageState(BlocCounter());
}
class _MyHomePageState extends State {
//组件计数变量
int _counter = 0;
//计数器Bloc
final BlocCounter bloc;
_MyHomePageState(this.bloc);
//计数增加方法
void _incrementCounter() {
//调用bloc的方法
bloc.increment(_counter);
}
@override
void initState() {
//监听Bloc里的数据
bloc.counter.listen((_count) {
//设置状态值
setState(() {
_counter = _count;
});
});
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Bloc示例'),
),
body: Center(
child: Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
),
//增加按钮
floatingActionButton: FloatingActionButton(
//点击事件
onPressed: _incrementCounter,
child: Icon(Icons.add),
),
);
}
}

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@作者: 亢少军

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