Accumulator
簡述：Flutter內(nèi)置的累加器，默認初始值為0
| 屬性/函數(shù) | 釋義 |
|---|---|
| value | 獲取此時的值 |
| increment(int addend) | 累加的函數(shù) |
示例
@override
Widget build(BuildContext context) {
// TODO: implement build
return Scaffold(
appBar: AppBar(
title: Text("Accumulator"),
),
body: Center(
child: Text('${_accumulator.value}',style: TextStyle(fontSize: 20),),
),
floatingActionButton: FloatingActionButton(
onPressed: (){
setState(() {
_accumulator.increment(1);
});
},
child: Icon(Icons.add),
),
);
}
accumulator.gif
