NSDateFormatter和日历 [英] NSDateFormatter and Japanese calendar

问题描述

当用户没有使用公历作为iPhone的默认日历时，我遇到使用NSDateFormatter的问题。

I'm having issues using NSDateFormatter when the user isn't using the Gregorian calendar as their default calendar for the iPhone.

NSString *testString = @"2011-01-14";
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"yyyy-MM-dd"];
NSDate *eventDate = [dateFormat dateFromString:testString];
[dateFormat setDateFormat:@"yyyy-MM-dd(EEE)"];
NSString *dateAndLocString = [dateFormat stringFromDate:eventDate];
[dateFormat release];

在使用公历日期的设备上，dateAndLocString将等于2011-01-13（星期四）
但是当用户使用日历时dateAndLocString将等于2011-01-13（周三），这是错误的。

On a device using the Gregorian calendar dateAndLocString will be equal to 2011-01-13(Thu) But when the user is using the Japanese calendar dateAndLocString will be equal to 2011-01-13(Wed), which is wrong.

任何人都知道什么我可能做错了吗？

Anyone have any idea what I might be doing incorrectly?

推荐答案

我找到了一种方法让它正常工作，如果有人有更好的建议请让我知道。我们必须使用以下代码行在NSDateFormatter上设置首选用户本地。

I found a way to get this to work correctly, if anyone has a better suggestion please let me know. We have to set the preferred user local on the NSDateFormatter using the following line of code.

[dateFormat setLocale:[[[NSLocale alloc] initWithLocaleIdentifier:[[NSLocale preferredLanguages] objectAtIndex:0]] autorelease]];

这将为NSDateFormatter提供正确的用户区域设置。有些人可能会想要使用

This will provide the correct user locale to the NSDateFormatter. Some people might be tempted to use

[dateFormat setLocale:[NSLocale currentLocale]];

但这不能用作 [NSLocale currentLocale] 在具有日语日历的系统上，即使用户语言设置为日语，也会返回en_US @ calendar = japanese。

But this will not work as [NSLocale currentLocale] on a system with a Japanese calendar returns en_US@calendar=japanese even if the user language is set to Japanese.

我不知道为什么NSDateFormatter不起作用自动在非公历日历上。

I have no clue why NSDateFormatter doesn't work automatically on non Gregorian calendars.

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