相对日期格式，过去日期的输出？ [英] Relative Date Formatting, output for past dates?

问题描述

我正在使用 - [NSDateFormatter setDoesRelativeDateFormatting：] 将日期显示为今天或昨天。我只是查看过去的日期，但很好奇我会为英国本地化的选项。

只是

• 今天


• 昨天

<

• 前一天

$

解决方案

b $ b

是否可能的输出列在任何地方，所以我可以了解正确显示它们所需的屏幕空间？

是的。当您运行以下程序时，它们会列在控制台窗口中：

  #import< Foundation / Foundation.h> 
 
 int main（int argc，const char * argv []）
 {
 
 @autoreleasepool {
 
 NSDateFormatter * formatter = [NSDateFormatter alloc] init]; 
 [formatter setDateStyle：NSDateFormatterFullStyle]; 
 [formatter setDoesRelativeDateFormatting：YES]; 
 
 NSCalendar * cal = [[NSLocale currentLocale] objectForKey：NSLocaleCalendar]; 
 NSDateComponents * minusOneDay = [[NSDateComponents alloc] init]; 
 [minusOneDay setDay：-1]; 
 NSDate * today = [NSDate date]; 
 NSDate * date = [NSDate date]; 
 
 while（1> [[cal components：NSYearCalendarUnit fromDate：date toDate：today options：0] year]）{
 
 NSLog（@％@ formatter stringFromDate：date]）; 
 date = [cal dateByAddingComponents：minusOneDay 
 toDate：date 
 options：0]; 
} 
 
} 
 return 0; 
} 
  

在我的语言环境中，列表似乎只是Tomorrow 和昨天。

I am looking at using -[NSDateFormatter setDoesRelativeDateFormatting:] to present dates as "Today" or "Yesterday". I am only looking at dates in the past but am curious what options I would see localised for the UK.

Just

• "Today"
• "Yesterday"

or anything more convoluted like

• "The day before yesterday"

Are the possible outputs listed anywhere so I can get an idea of the screen space needed to correctly display them?

解决方案

Yes. They are listed in your console window when you run the following program:

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{

    @autoreleasepool {

        NSDateFormatter * formatter = [[NSDateFormatter  alloc] init];
        [formatter setDateStyle:NSDateFormatterFullStyle];
        [formatter setDoesRelativeDateFormatting:YES];

        NSCalendar * cal = [[NSLocale currentLocale] objectForKey:NSLocaleCalendar];
        NSDateComponents * minusOneDay = [[NSDateComponents alloc] init];
        [minusOneDay setDay:-1];
        NSDate * today = [NSDate date];
        NSDate * date = [NSDate date];

        while( 1 > [[cal components:NSYearCalendarUnit fromDate:date toDate:today options:0] year] ){

            NSLog(@"%@", [formatter stringFromDate:date]);
            date = [cal dateByAddingComponents:minusOneDay
                                        toDate:date
                                       options:0];
        }

    }
    return 0;
}

In my locale, the list seems to just be "Tomorrow", "Today", and "Yesterday".

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