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
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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