iOS – 友好的NSDate格式

- (NSString *)formattedDate:(NSDate *)date
{
     NSTimeInterval timeSinceDate = [[NSDate date] timeIntervalSinceDate:date];

     // print up to 24 hours as a relative offset
     if(timeSinceDate < 24.0 * 60.0 * 60.0)
     {
         NSUInteger houRSSinceDate = (NSUInteger)(timeSinceDate / (60.0 * 60.0));

         switch(houRSSinceDatE)
         {
              default: return [NSString StringWithFormat:@"%d hours ago",houRSSinceDate];
              case 1: return @"1 hour ago";
              case 0:
                  NSUInteger minutesSinceDate = (NSUInteger)(timeSinceDate / 60.0);
                  /* etc,etc */
              break;
         }
     }
     else
     {
          /* normal NSDateFormatter stuff here */
     }
}

所以这是打印’x分钟前’或’x小时前’从日期起24小时,通常是一天.