因此,目前,我有一个由柜台代表的数字。该数字是递增的,并且会不断变化。我的目标是每3位数字添加一个逗号,以使该数字在我的应用中更具可读性。我遇到的唯一问题是
String number = counter.replaceAllMapped(new RegExp(r'(\d{1,3})(?=(\d{3})+(?!\d))'),
(Match m) => '${m[1]},');
拒绝将整数counter
用作int。在通过运行之前,如何将int counter
转换为String middle
String number = middle.replaceAllMapped(new RegExp(r'(\d{1,3})(?=(\d{3})+(?!\d))'),
(Match m) => '${m[1]},');
我的目标是这样的:counter = 1000;
middle = "1000";
number = "1,000";
我当前的解决方案还能工作吗?如果没有,如何更改代码以实现目标?
更新:
这是我的代码:
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int counter = 0;
void _incrementCounter() {
setState(() {
if (counter > 99999999) {
//WinLandingPage();
} else if (counter >= 99000000) {
counter++;
} else if (counter > 990000) {
counter += 1000000;
} else if (counter > 9900) {
counter += 10000;
} else if (counter > 99) {
counter += 100;
} else counter++;
});
}
//BELOW is where the format is taking place, and I have no idea how to
//get this part working. This is my broken attempt.
var f = new NumberFormat("#,###,###,###", "en_US");
var number = f.format(counter);
//What am I doing wrong here?
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar (
title: new Text(widget.title),
),
body: new Center(
child: new Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
new Text(
'Try to get $number to 100,000,000.',
),
new Text(
'$number',
style: Theme.of(context).textTheme.display1,
),
],
),
),
floatingActionButton: new FloatingActionButton(
onPressed: _incrementCounter,
backgroundColor: Colors.pinkAccent,
tooltip: 'Increment',
child: new Icon(Icons.add),
),
);
}
}
我在这段代码中做错了什么?我对Dart不太熟悉,但是我正在竭尽全力从你们的尝试,错误和支持中找出问题。
最佳答案
您可以使用NumberFormat包中的intl来执行此操作
README.md中的一个示例
var f = new NumberFormat("###.0#", "en_US");
print(f.format(12.345));
==> 12.34
你的例子可能是
var f = new NumberFormat("#,###", "en_US");
print(f.format(1000));
==> 1,000
关于dart - 如何在Dart中将int转换为字符串?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/49200533/