//Get all prevIoUs noti..
 NSLog(@"scheduled notifications: --%@----",[[UIApplication sharedApplication] scheduledLocalNotifications]);

 NSDate *now = [NSDate date];
 now = [now dateByAddingTimeInterval:60*60*24*7]; //7 for 7th day of the week.
 NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

[calendar setTimeZone:[NSTimeZone localTimeZone]];
 NSDateComponents *components = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit|NSTimeZoneCalendarUnit fromDate:now];


 NSDate *SetAlarmAt = [calendar dateFromComponents:components];


 UILocalNotification *localNotification = [[UILocalNotification alloc] init];

 localNotification.fireDate = SetAlarmAt;


 NSLog(@"FIRE DATE --%@----",[SetAlarmAt description]);

 localNotification.alertBody =@"Alert";

 localNotification.alertAction = [NSString stringWithFormat:@"My test for Weekly alarm"];

 localNotification.userInfo = @{
                           @"alarmID":[NSString stringWithFormat:@"123"],@"SOUND_TYPE":[NSString stringWithFormat:@"hello.mp3"]
                           };

  localNotification.repeatInterval=0; //[NSCalendar currentCalendar];


  [[UIApplication sharedApplication] scheduleLocalNotification:localNotification];

>对于iOS 10.0及更高版本：现在尝试使用UserNotifications框架：添加框架,并像#import一样导入.在Appdelegate Didfinishluanch方法.

UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
    [center requestAuthorizationWithOptions:(UNAuthorizationOptionBadge | UNAuthorizationOptionSound | UNAuthorizationOptionAlert)
              completionHandler:^(BOOL granted,NSError * _Nullable error) {
                  if (!error) {
                      NSLog(@"request succeeded!");
                      [self testAlrt];
                  }
              }];

在你的ibaction或方法中,写下它并测试：

NSDate *now = [NSDate date];

// NSLog(@"NSDate--before:%@",now);

now = [now dateByAddingTimeInterval:60*60*24*7];

NSLog(@"NSDate:%@",now);

NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

[calendar setTimeZone:[NSTimeZone localTimeZone]];

NSDateComponents *components = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit|NSTimeZoneCalendarUnit fromDate:now];

NSDate *todaySehri = [calendar dateFromComponents:components]; //unused



UNMutableNotificationContent *objNotificationContent = [[UNMutableNotificationContent alloc] init];
objNotificationContent.title = [NSString localizedUserNotificationStringForKey:@"Notification!" arguments:nil];
objNotificationContent.body = [NSString localizedUserNotificationStringForKey:@"This is local notification message!"
                                                                    arguments:nil];
objNotificationContent.sound = [UNNotificationSound defaultSound];

/// 4. update application icon badge number
objNotificationContent.badge = @([[UIApplication sharedApplication] applicationIconBadgeNumber] + 1);


UNCalendarNotificationTrigger *trigger = [UNCalendarNotificationTrigger triggerWithDateMatchingComponents:components repeats:NO];


UNNotificationRequest *request = [UNNotificationRequest requestWithIdentifier:@"ten"
                                                                      content:objNotificationContent trigger:trigger];
/// 3. schedule localNotification
UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
[center addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error) {
    if (!error) {
        NSLog(@"Local Notification succeeded");
    }
    else {
        NSLog(@"Local Notification Failed");
    }
}];