Cancelling a specific UILocalNotification

Question

I have this code for local notification, and I have a scheduleNotification and clearNotification using my own method. These are the codes:

- (void)clearNotificat         


        

Answer 1

NSArray *notifications = [[UIApplication sharedApplication] scheduledLocalNotifications];
for (UILocalNotification *not in notifications) {
    NSString *dateString=[not.userInfo valueForKey:@"EndDate"];
    if([dateString isEqualToString:@"CompareString"])
    { 
        [[UIApplication sharedApplication] cancelLocalNotification:not];
    }
}

1. Give user info whenever you create local notification (this is a key-value pair).
2. Iterate through notifications (it contains All Local Notifications) and compare value for the known key. In the above example I am using EndDate as the key and CompareString as the value.

Its Working Fine With Me.

Cheers..

Answer 2

(void)cancelLocalNotification:(NSString*)notificationID
{

   // UILocalNotification *cancelThisNotification = nil;
  //  BOOL hasNotification = NO;

    for (int j =0;j<[[[UIApplication sharedApplication]scheduledLocalNotifications]count]; j++)
    {
        UILocalNotification *someNotification = [[[UIApplication sharedApplication]scheduledLocalNotifications]objectAtIndex:j];
        if([[someNotification.userInfo objectForKey:@"drdid"] isEqualToString:notificationID])
        {
            NSLog(@"id,notificationID(App) %@ %@ ",[someNotification.userInfo objectForKey:@"drdid"],notificationID);
            NSLog(@"canceled notifications %@",someNotification);
           [[UIApplication sharedApplication] cancelLocalNotification:someNotification];
        }

    }
}

Answer 3

I would suggest using the userInfo property on UILocalNotification, as others have mentioned. A simpler implementation that the accepted answer would be:

for(UILocalNotification* notification in [[UIApplication sharedApplication]scheduledLocalNotifications])
{
       if([[notification.userInfo objectForKey:@"notification_identifier"] isEqualToString:@"notification_001"])
       {
            [[UIApplication sharedApplication] cancelLocalNotification:notification];
       }
}

A for loop like this is much simpler. I'm not sure if it's more or less optimal, but it's certainly easier to read, and I assume you only have a few notifications to loop through anyway.