Question

我正在尝试显示过去5天的日期。但它只显示最后日期（昨天）。我使用以下代码来显示它。

.h文件：

NSInteger getDist;
NSString *lastdate;
NSDateFormatter *dateFormatter;
NSDate *sevenDaysAgo;
NSDate *dateAfterDecrement;
NSString *dateString;
int i;

viewDidLoad中：

NSDate *currDate = [NSDate date];
dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:@"dd.MM.YY"];
dateString = [dateFormatter stringFromDate:currDate];
_currentDate.text=dateString;

-(void)display
{
  for(i=1;i<=5;i++)
  {
    lastdate = _currentDate.text;
    [dateFormatter setDateFormat:@"dd.MM.YY"];
    sevenDaysAgo = [dateFormatter dateFromString:lastdate];
    dateAfterDecrement=[sevenDaysAgo initWithTimeIntervalSinceNow:-
    (24*60*60)];
    }
    _currentDate.text =  [dateFormatter stringFromDate:dateAfterDecrement];

}

请建议我。

Answer 1

您可以按照您希望获得的天数减少当前日期

    NSCalendar *calendar = [NSCalendar autoupdatingCurrentCalendar]; 
    NSDateComponents *datecomponents = [calendar components:NSYearCalendarUnit
                        | NSMonthCalendarUnit | NSDayCalendarUnit
                        fromDate:[NSDate date]];
             for (int i = 0; i < 5; ++i) {
              NSDate *date = [calendar dateFromComponents:datecomponents];
              NSLog(@"%@",date);
              --datecomponents.day;
             }

Answer 2

这里是如何显示今天的日期，然后是过去的4天＆＃39;日期。

NSDateFormatter* formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"MMM dd, yyyy"];
[formatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];

int DAY_TO_SECONDS = -60*60*24;
for (int n=0; n<5; n++)
{
    NSDate* date = [[NSDate date] dateByAddingTimeInterval:DAY_TO_SECONDS*n];
    NSString* dateString = [formatter stringFromDate:date];

    NSLog(@"%@", dateString);
}

这会产生如下输出：

2015-02-23 13:18:30.657 ClientInfo[1418:557691] Feb 23, 2015
2015-02-23 13:18:30.658 ClientInfo[1418:557691] Feb 22, 2015
2015-02-23 13:18:30.658 ClientInfo[1418:557691] Feb 21, 2015
2015-02-23 13:18:30.658 ClientInfo[1418:557691] Feb 20, 2015
2015-02-23 13:18:30.658 ClientInfo[1418:557691] Feb 19, 2015

在ios中显示最后5天的日期

2 个答案: