gistfile1.txt

UNMutableNotificationContent* content = [[UNMutableNotificationContent alloc] init];

content.title = [NSString localizedUserNotificationStringForKey:@"Hello!"
                                                      arguments:nil];

content.body = [NSString localizedUserNotificationStringForKey:@"Hello_message_body"
                                                     arguments:nil];
content.sound = [UNNotificationSound defaultSound];

UNTimeIntervalNotificationTrigger* trigger = [UNTimeIntervalNotificationTrigger triggerWithTimeInterval:5
                                                                                                repeats:NO];

UNNotificationRequest *notificationRequest = [UNNotificationRequest requestWithIdentifier:kNotificationIdentifier
                                                                                  content:content
                                                                                  trigger:trigger];

UNUserNotificationCenter* center = [UNUserNotificationCenter currentNotificationCenter];
[center addNotificationRequest:notificationRequest
         withCompletionHandler:^(NSError * _Nullable error) {
             NSLog(@"completed!");
         }];

Creating a simple local notification in Objective C