如何在ios中设置所选日期两周前的提醒

Question

我下面有一个要求，

1. 首先需要选择日期
2. 然后应用程序需要显示提醒选项，如（2周前，1周前，3天前等）
3. 如果选择的日期是两天后，那么我需要禁用2周前和1周前选项

以下是我使用但不起作用的代码，

 - (IBAction)timePicker:(id)sender {
selectedTimeRow = [sender tag];

NSDate *date2=[NSDate date];

NSDate *DaysAgo;
if (selectedTimeRow==0) {
    DaysAgo = [date2 dateByAddingTimeInterval:14*24*60*60];
    NSLog(@"14 days ago: %@", DaysAgo);
}else if (selectedTimeRow==1){
    DaysAgo = [date2 dateByAddingTimeInterval:7*24*60*60];
    NSLog(@"7 days ago: %@", DaysAgo);
}else if (selectedTimeRow==2){
    DaysAgo = [date2 dateByAddingTimeInterval:3*24*60*60];
    NSLog(@"3 days ago: %@", DaysAgo);
}else if (selectedTimeRow==3){
    DaysAgo = [date2 dateByAddingTimeInterval:1*24*60*60];
    NSLog(@"1 days ago: %@", DaysAgo);
}

NSDateFormatter *format = [[NSDateFormatter alloc] init];
format.dateFormat = @"dd/MM/yyyy";
NSString *dateNew=[format stringFromDate:DaysAgo];
UIButton *button = (UIButton *)sender;
UITableViewCell *cell = (UITableViewCell*)[button superview];

//

NSComparisonResult result = [dateNew compare:_SavedDate];
if(result == NSOrderedAscending)
{
    NSLog(@"date1 is later than date2");
  cell.userInteractionEnabled=NO;

}else if (result == NSOrderedDescending) {
    NSLog(@"date1 is earlier than date2");
       [self calltoolrBar];
    cell.userInteractionEnabled=YES;
}
else
{
    NSLog(@"date1 is equal to date2");
    [self calltoolrBar];
    cell.userInteractionEnabled=YES;
        }
}

Answer 1

1. 获取两周前的日期

   NSDate*selectedDate=YOUR_DATE；NSDate*twoWeeksAgoDate=[selectedDateByAddingTimeInterval:-14*24*60*60]；//-14是14天前（2周）。你需要按照自己的意愿改变。NSLog（@"两周前：%@"，twoWeeksAgoDate）；

2. 设置两周前日期的本地通知

   UILocalNotification*通知=[[UILocalNotification alloc]init]；notification.repeatInterval=NSDayCalendarUnit；[通知setAlertBody:@"您的提醒"]；[通知setFireDate:towWeeksAgoDate]；[通知setTimeZone:[NSTimeZone defaultTimeZone]]；[application setScheduledLocalNotifications:[NArray arrayWithObject:notification]]；