Generate Local Notification For every 28 days iOS 10 Objective-C

Question

I have to generate a local notification for every 28 days,i.e the user will register on a particular date i need to generate a Local notification exactly after 28 days form that registration date,and from then i need to repeatedly generate that local notification for every 28 days.

Answer 1

Check accepted answer from here : How to schedule a local notification in iOS 10 (objective-c)

1. Try it. Its deprecated but working code. Use it for Before iOS 10.0 :

   //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];
   

   2. For iOS 10.0 and later: Now try with UserNotifications framework: Add the framework, and import like #import . In Appdelegate Didfinishluanch method.

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

In your ibaction or method, write it and test:

 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");
    }
}];