首页 \ 问答 \ NSDateFormatter没有输出我的期望(NSDateFormatter not outputting what I expect)

NSDateFormatter没有输出我的期望(NSDateFormatter not outputting what I expect)

我有以下代码,应该格式化时间字符串(“0800”),然后我可以再次格式化为HH:MM格式进行显示。

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
if([timeString intValue] < 1000)
    dateFormatter.dateFormat = @"Hmm";
else
    dateFormatter.dateFormat = @"HHmm";

NSDate *date = [dateFormatter dateFromString:timeString];

如果时间字符串长度小于4个字符,则相应地更改格式字符串。

问题是如果时间字符串是0800,则dateFormatter从timeString的转换返回nil

我怎样才能解决这个问题?


I have the following code that is supposed to format a time string ("0800") so I can then format it again into HH:MM format for display.

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
if([timeString intValue] < 1000)
    dateFormatter.dateFormat = @"Hmm";
else
    dateFormatter.dateFormat = @"HHmm";

NSDate *date = [dateFormatter dateFromString:timeString];

If the time string length is less than 4 characters, then the format string is altered accordingly.

The problem is that if the time string is 0800, the dateFormatter returns nil from the conversion of timeString.

How can I fix this?


原文:https://stackoverflow.com/questions/24682367
更新时间:2020-03-27 09:27

最满意答案

无论时间字符串的整数值如何,都需要使用HHmm0800的格式为HHmm ,而不是Hmm 。 如果字符串是800那么使用Hmm会有意义。


You need to use HHmm regardless of the integer value of the time string. 0800 has the format HHmm, not Hmm. If the string were 800 then using Hmm would make sense.

2014-07-10

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