IOS How to using UILocalNotification

1) When the app is closed, schedule a local notification that will fire in 24 hours

UILocalNotification *notification = [[UILocalNotification alloc] init];
    notification.fireDate = [[NSDate date] dateByAddingTimeInterval:60*60*24];
    notification.alertBody = @"24 hours passed since last visit :(";
    [[UIApplication sharedApplication] scheduleLocalNotification:notification];

2)If the app is opened (before the local notification fires), 

    cancel the local notification

- (void)applicationDidBecomeActive:(UIApplication *)application
{
    [[UIApplication sharedApplication] cancelAllLocalNotifications];
}

3)Receiving the Notification

 - (void)application:(UIApplication *)app didReceiveLocalNotification:

                                                  (UILocalNotification *)notif {
 // Handle the notification when the app is running
 NSLog(@"Recieved Notification %@",notif);
}