設置DatePicker的時間

Question

如何在當前日期的00:00:00設置DatePicker的時間？

- (void) awakeFromNib 
    { 
     [datePicker setDateValue:[NSDate date]]; 
     NSDate *now = [NSDate date]; 
     int daysToAdd = 364; 
     NSDate *newDate1 = [now dateByAddingTimeInterval:60*60*24*daysToAdd]; 
     [datePicker1 setDateValue:newDate1]; 
    } 

Answer 1

畏縮

它看起來像你有兩個不同的datePickers？ datePicker和datePicker1？那是怎麼回事？

而且，這不會做你期待什麼：

NSDate *newDate1 = [now dateByAddingTimeInterval:60*60*24*364]; 

這是創建在未來究竟31449600秒一個新的日期。這是而不是做其他事情。

你想要做的是從當前日期提取所有日期的組件和零出來：

NSDate *now = [NSDate date]; 
NSDateComponents *nowComponents = [[NSCalendar currentCalendar] components:(NSEraCalendarUnit | NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit) fromDate:now]; 

// technically these next lines are unnecessary, since we only pulled out the era-year-month-day, but they're included here for understanding/completeness: 

[nowComponents setHour:0]; 
[nowComponents setMinute:0]; 
[nowComponents setSecond:0]; 

// now we can turn it back into a date: 

NSDate *todayAtMidnight = [[NSCalendar currentCalendar] dateFromComponents:nowComponents];