更改Dart的NumberFormat中的分组分隔符 [英] Change grouping separator in NumberFormat for Dart

问题描述

我有双重价值

double myNum = 110700.00;

我想使用 NumberFormat 修改其格式

110 700

110 700

如何做到?

推荐答案

您不能在不更改语言环境的情况下执行此操作，因为GROUP_SEP是最终的.

You can't do it without changing locale because GROUP_SEP is final.

但是，如果您不介意更改语言环境，则可以在任何特定实例上执行此操作，例如使用 new NumberFormat('###，000'，'fr')，然后选择使用不间断空格作为GROUP_SEP的任何语言环境(例如法语).当然，然后您将 用作小数点分隔符，但是如果您从未使用过它，那将是无聊的事.碰巧对问题中的示例有用，但不能一概而论.

However, if you don't mind changing locale, which you can do on any particular instance, for example with new NumberFormat('###,000', 'fr') then pick any locale (e.g. French) which uses non-breaking space as the GROUP_SEP. Of course, you then end up with , as your decimal separator but if you don't ever use it then it's moot. That happens to work for the example in the question, but doesn't generalize.

可以(尽管很脆弱)定义自己的语言.因此，如果您碰巧是说英语的澳大利亚人，更喜欢使用不间断空格作为组分隔符，请定义自己的语言环境(例如 zz )

It's possible (though fragile) to define your own language. So if you happen to be an English-speaking Australian who prefers non-breaking space as your group separator then define your own locale (e.g. zz)

import 'package:intl/intl.dart';
import 'package:intl/number_symbols_data.dart';
import 'package:intl/number_symbols.dart';

    main() {
      numberFormatSymbols['zz'] = new NumberSymbols(
        NAME: "zz",
        DECIMAL_SEP: '.',
        GROUP_SEP: '\u00A0',
        PERCENT: '%',
        ZERO_DIGIT: '0',
        PLUS_SIGN: '+',
        MINUS_SIGN: '-',
        EXP_SYMBOL: 'e',
        PERMILL: '\u2030',
        INFINITY: '\u221E',
        NAN: 'NaN',
        DECIMAL_PATTERN: '#,##0.###',
        SCIENTIFIC_PATTERN: '#E0',
        PERCENT_PATTERN: '#,##0%',
        CURRENCY_PATTERN: '\u00A4#,##0.00',
        DEF_CURRENCY_CODE: 'AUD',
      );

      print(new NumberFormat('###,000', 'zz').format(110700));
    }

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