Method ViewDidLoad not called from sub-class?

Question

In my iPhone App.

I have two view controllers.

They have SuperClass-SubClass Relation.(Inheritance).

Let Say ViewController1 is a SuperClass and ViewController2 is a SubClass.

They both share a common nib file of super class.

So, Ideally all the methods of ViewController1 is inherited to ViewController2 (If I am not overriding it in ViewController2).

So, To check this When I am

My viewcontroller2 Loads viewDidLoad not called from super class.

**ViewController1

-ViewDidLoad

-ViewWillApper


**ViewController2

Other methods but I am not writing ViewDidLoad and ViewWillAppear
//---------------

So,When this separate page ViewController2 is called. ViewDidLoad is not called of SuperClass. But ViewWillAppear is called.

Andrew Andrew · Accepted Answer · 2011-11-01T08:09:32

It may be that -viewDidLoad: is only called once because the same nib file is shared between the two classes. After the first time the nib is loaded into memory, -viewDidLoad: is called. It isn't called a second time because it's simply being reused from memory where it already resides, so it does not need to be reloaded. This would explain why -viewWillAppear: is still called.

UIViewController Class Reference: -viewDidLoad:

viewDidLoad

Called after the controller’s view is loaded into memory.

(void)viewDidLoad

Discussion

This method is called after the view controller has loaded its associated views into memory. This method is called regardless of whether the views were stored in a nib file or created programmatically in the loadView method. This method is most commonly used to perform additional initialization steps on views that are loaded from nib files.

Method ViewDidLoad not called from sub-class?

2 Answers