格式字符串，带前导零的整数

问题描述

我想将一个整数值转换为一个带有前导零的字符串(如果需要)，这样该字符串总共有 3 个字符.例如，5 会变成 005"，10 会变成 010".p>

我试过这段代码:

NSString* strName = [NSString stringWithFormat:@"img_00%d.jpg", i];

这部分有效，但如果 i 的值为 10，例如，结果是 img_0010.jpg，而不是 img_010.jpg.

有没有办法做我想做的事?

解决方案

使用格式字符串"img_%03d.jpg"获取三位前导零的十进制数.

I want to convert an integer value to a string with leading zeroes (if necessary) such that the string has 3 total characters. For example, 5 would become "005", and 10 would become "010".

I've tried this code:

NSString* strName = [NSString stringWithFormat:@"img_00%d.jpg", i];

This partially works, but if i has the value of 10, for example, the result is img_0010.jpg, not img_010.jpg.

Is there a way to do what I want?

解决方案

Use the format string "img_%03d.jpg" to get decimal numbers with three digits and leading zeros.

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