Should Notificationcenter observer selector methods go in the header file?

Question

One of the things i (still) have trouble getting into the back of my head is public/private methods, parameters and how it works compared to the Java world i have been living in for a long time.

I have started using the notificationcenter since a while back, and i noticed that you can declare a method within your implementation file (.m) and use that as a selector when registering your observer in the nsnotificationcenter

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(aMethodNotDefinedInTheHeaderFile:) name:NOTIFICATION_KEY object:nil];

So, my question is - what is best practice here? Should i still define the method in my header file, and to what end?

Pointers much appreciated.

Answer 1

Declaring methods in header files is used to get users of the class overview of a methods which they can use.

As soon as subscribing for a notification is usually an internal thing (you subscribe and receive notification in the same class), I'd say it's not needed.

However, if the method is a part of API, which can be used elsewhere, you'd probably want to put it in .h file.