如何格式化用户语言环境的当前日期? [英] How do I format the current date for the user's locale?

问题描述

我在尝试获取当前日期并在当前语言环境中设置其格式的代码.

I have this code where I'm trying to get the current date and format it in the current locale.

NSDate *now = [NSDate date];  //  gets current date
NSString *sNow = [[NSString alloc] initWithFormat:@"%@",now];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"mm-dd-yyyy"];
insertCmd = [insertCmd stringByAppendingString: formatter setDateFormat: @"MM.dd.yyyy"];

我知道最后一行是错误的，但似乎无法弄清楚……"insertCmd"是我为FMDB命令构建的NSString.

I know the last line is wrong, but can't seem to figure it out... "insertCmd" is a NSString that I'm building for a FMDB command.

我们将不胜感激，或者提供了指向其中描述了"doc"的指针.

Help would be greatly appreciated, or a pointer to the "doc" where it's described.

推荐答案

在这种情况下，我不会使用 setDateFormat ，因为它将日期格式器限制为特定的日期格式(doh！)-您需要一种动态格式，具体取决于用户的语言环境.

I wouldn't use setDateFormat in this case, because it restricts the date formatter to a specific date format (doh!) - you want a dynamic format depending on the user's locale.

NSDateFormatter为您提供了一组内置的日期/时间样式，您可以从中进行选择，即NSDateFormatterMediumStyle，NSDateFormatterShortStyle等.

NSDateFormatter provides you with a set of built-in date/time styles that you can choose from, i.e. NSDateFormatterMediumStyle, NSDateFormatterShortStyle and so on.

所以您应该做的是:

NSDate* now = [NSDate date];
NSDateFormatter* df = [[NSDateFormatter alloc] init];
[df setDateStyle:NSDateFormatterMediumStyle];
[df setTimeStyle:NSDateFormatterShortStyle];
NSString* myString = [df stringFromDate:now];

这将为您提供一个字符串，该字符串具有中等长度的日期和较短的时间，所有这些都取决于用户的语言环境.试用设置，然后选择所需的任何内容.

This will provide you with a string with a medium-length date and a short-length time, all depending on the user's locale. Experiment with the settings and choose whichever you like.

以下是可用样式的列表:

Here's a list of available styles: https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSDateFormatter_Class/Reference/Reference.html#//apple_ref/c/tdef/NSDateFormatterStyle

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