Objective-C如何打印出浮点数的前导0? [英] Objective-C how to print out leading 0 for a float?

问题描述

如何使用 NSString 类型为浮点数打印前导零?

How do you print out leading zeros for a float using the NSString type?

Input: 3.14
Desired output: 03.1

Using format @"%02.1f"
Output: 3.1

推荐答案

你想要 @"04.1f".4 是总宽度.

正如您从 文档，格式字符串符合IEEE printf 规范.

As you can see from the documentation, the format strings conform to the IEEE printf specification.

您指定的格式字符串分解如下:

The format string you've specified breaks down as follows:

0 -- 用零填充.
2 -- 整个生成的格式化值的最小宽度为 2.
.1 -- 小数点后一位精度.

0 -- Pad with zeros.
2 -- The entire resulting formatted value will have a minimum width of 2.
.1 -- Precision of 1 digit following the decimal point.

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