将双精度数限制为两位小数

问题描述

如何实现以下从双精度到字符串的转换:

How do I achieve the following conversion from double to a string:

1.4324 => "1.43"
9.4000 => "9.4"
43.000 => "43"

即我想四舍五入到小数位，但不想要任何尾随零，即我不想要

i.e. I want to round to to decimal places but dont want any trailing zeros, ie i dont want

9.4 => "9.40" (wrong)
43.000 => "43.00" (wrong)

所以我现在拥有的这段代码不起作用，因为它显示了多余的零:

So this code which I have now doesn't work as it displays excess zeros:

[NSString stringWithFormat: @"%.2f", total]

推荐答案

使用 NSNumberFormatter.请参阅 数据格式化编程指南 的关于 数字格式化程序.

Use NSNumberFormatter. See the Data Formatting Programming Guide's chapter on Number Formatters.

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