iphone - 如何合并来自两个 UIDatePickers 的日期和时间？

Question

我的应用程序中有两个 UIDatePickers，一种模式用于选择日期，另一种模式用于时间模式。当到达确切的日期和时间时，我已发出通知。我能够在正确的时间触发提醒，但问题是没有检查日期。有什么办法可以同时查看日期和时间吗？？

提前致谢...

编辑

NSDate *date1 = [datePicker date];
NSDate *date2 = [timePicker date];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

unsigned unitFlagsDate = NSYearCalendarUnit | NSMonthCalendarUnit |  NSDayCalendarUnit;
NSDateComponents *dateComponents = [gregorian components:unitFlagsDate fromDate:date1];
unsigned unitFlagsTime = NSHourCalendarUnit | NSMinuteCalendarUnit ;
NSDateComponents *timeComponents = [gregorian components:unitFlagsTime fromDate:date2];

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

NSDate *combDate = [gregorian dateFromComponents:dateComponents];   

UILocalNotification *localNotif = [[UILocalNotification alloc] init];
if (localNotif == nil) return;
NSDate *fireTime = combDate;
localNotif.fireDate = fireTime;
localNotif.alertBody = @"Alert!";
localNotif.soundName = UILocalNotificationDefaultSoundName;  
[[UIApplication sharedApplication] scheduleLocalNotification:localNotif];

Answer 1

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

NSDateComponents *newComponents = [[NSDateComponents alloc]init];
newComponents.timeZone = [NSTimeZone systemTimeZone];
[newComponents setDay:[dateComponents day]];
[newComponents setMonth:[dateComponents month]];
[newComponents setYear:[dateComponents year]];
[newComponents setHour:[timeComponents hour]];
[newComponents setMinute:[timeComponents minute]];

NSDate *combDate = [calendar dateFromComponents:newComponents]; 

NSLog(@" \ndate : %@ \ntime : %@\ncomDate : %@",self.datePicker.date,self.timePicker.date,combDate);