implementing Handling NSNotificationCenter Observers during ViewController Transitions in Objective-C
I've been researching this but I'm sure I'm missing something obvious here, but I'm working with unexpected behavior when using `NSNotificationCenter` to handle events across different view controllers... Specifically, I have a view controller (let's call it `FirstViewController`) that posts a notification when a button is tapped, and I want to listen for that notification in another view controller (`SecondViewController`). In `FirstViewController`, I am posting the notification like this: ```objective-c [[NSNotificationCenter defaultCenter] postNotificationName:@"MyNotification" object:nil]; ``` In `SecondViewController`, I am trying to observe the notification in `viewDidLoad`: ```objective-c - (void)viewDidLoad { [super viewDidLoad]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleNotification:) name:@"MyNotification" object:nil]; } - (void)handleNotification:(NSNotification *)notification { NSLog(@"Notification received!"); } ``` The question arises when I transition from `FirstViewController` to `SecondViewController`. I expect to see the log message when the notification is posted, but it doesn't get triggered. I suspect it has something to do with the timing of the notification being posted and the observer being added. I've tried moving the observer registration to `viewWillAppear`, but that didn't help either. Additionally, I made sure to remove the observer in `dealloc`: ```objective-c - (void)dealloc { [[NSNotificationCenter defaultCenter] removeObserver:self]; } ``` I'm using Xcode 14.0 and targeting iOS 15.0. Any insights on what might be going wrong? Is there a best practice for using `NSNotificationCenter` during transitions between view controllers? What am I doing wrong? I'm working on a application that needs to handle this. Am I missing something obvious?