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In Apple's scrollView example they don't call that. I always thought that's a must. Why should I call that anyways?
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viewDidLoad method is called only once in ViewController lifecycle. The reason retrieveMessage() is called in viewDidLoad because it's adding observer to start listening for received and sent message.
viewDidLoad() is one of the initialization methods that is called on the initial view controller. viewDidLoad() is called before anything is shown to the user - and it is called only once.
-viewDidLoad will be called once whenever the view controller needs to load its view hierarchy. Obviously, that'll happen the first time that the controller accesses its view. If the view controller later unloads its view, then -viewDidLoad will be called again the next time the view is loaded.
If you are overriding the method you should still call the method in the super. Even if the super class is not doing anything with it today, Apple might one day change the implementation and your code will mysteriously stop working. If you really don't need to do anything in that method, leave it out of your code entirely, and the super's method will run as usual, without any intervention on your part.
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