如何确定语言环境的日期格式是月/日还是日/月?

问题描述

在我的 iPhone 应用中，我希望能够确定用户区域设置的日期格式是月/日(即 1/5 表示 1 月 5 日)还是日/月(即 5/1 表示 1 月 5 日).我有一个自定义 NSDateFormatter 不使用基本格式之一，例如 NSDateFormatterShortStyle (11/23/37).

In my iPhone app, I'd like to be able to determine if the user's locale's date format is Month/Day (i.e. 1/5 for January fifth) or Day/Month (i.e. 5/1 for January fifth). I have a custom NSDateFormatter which does not use one of the basic formats such as NSDateFormatterShortStyle (11/23/37).

在理想情况下，我想使用 NSDateFormatterShortStyle，但不显示年份(仅显示月份和日期#).完成此任务的最佳方法是什么?

In an ideal world, I want to use NSDateFormatterShortStyle, but just not display the year (only month & day#). What's the best way to accomplish this?

推荐答案

你要使用NSDateFormatter的+dateFormatFromTemplate:options:locale:

You want to use NSDateFormatter's +dateFormatFromTemplate:options:locale:

这是一些 Apple 示例代码:

Here is some Apple sample code:

NSLocale *usLocale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];
NSLocale *gbLocale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_GB"];

NSString *dateFormat;
NSString *dateComponents = @"yMMMMd";

dateFormat = [NSDateFormatter dateFormatFromTemplate:dateComponents options:0 locale:usLocale];
NSLog(@"Date format for %@: %@",
    [usLocale displayNameForKey:NSLocaleIdentifier value:[usLocale localeIdentifier]], dateFormat);

dateFormat = [NSDateFormatter dateFormatFromTemplate:dateComponents options:0 locale:gbLocale];
NSLog(@"Date format for %@: %@",
    [gbLocale displayNameForKey:NSLocaleIdentifier value:[gbLocale localeIdentifier]], dateFormat);

// Output:
// Date format for English (United States): MMMM d, y
// Date format for English (United Kingdom): d MMMM y

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