如何将UIDatePicker的日期秒值设置为00？

Question

如何总是得到秒数值" 00" UIDatePicker的日期？

现在我正在获得像这种格式的价值5:30:45,我需要获得这种格式的时间5:30:00.

怎么做到这一点？

Answer 1

我用这个代码它工作正常.

NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *dateComponents = [calendar components:( NSYearCalendarUnit | NSMonthCalendarUnit |  NSDayCalendarUnit ) fromDate:datePicker.date];
    NSDateComponents *timeComponents = [calendar components:( NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit ) fromDate:datePicker.date];

    [dateComponents setHour:[timeComponents hour]];
    [dateComponents setMinute:[timeComponents minute]];
    [dateComponents setSecond:0.0];

    NSDate *newDate = [calendar dateFromComponents:dateComponents];  

Answer 2

您不必使用NSDateComponents或将日期转换为字符串并返回.您可以告诉日历将日期设置为分钟的开头(小时/日期/周/ ...)

NSDate *date = self.datePicker.date;
[[NSCalendar currentCalendar] rangeOfUnit:NSCalendarUnitMinute
                                startDate:&date
                                 interval:NULL
                                  forDate:date];
//date now is set to the beginning of the minute -> seconds == 00

Answer 3

NSDate *currentDate = [datePicker date];    
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"ss"];
[dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0.0]];
NSString *Str_Seccond=[dateFormatter stringFromDate:currentDate];

在 Str_Seccond 字符串中，您可以获取字符串格式的秒。