IB中的子类

Question

I have UIScrollView added to the main window of the app with IB. What I want is that view to subclass UICustomScrollView instead of UIScrollView. To do that I choose the UIScrollView and then I change Custom class to UICustomScrollView in identity inspector. I have put some NSLog messages in init method of UICustomScrollView. When I run the app UICustomScrollView seem like it is not used because NSLog messages in init are not printed.

What I miss here ?

Answer 1

Here's what the UIView Class Reference has to say about initWithFrame: :

If you use Interface Builder to design your interface, this method is not called when your view objects are subsequently loaded from the nib file. Objects in a nib file are reconstituted and then initialized using their initWithCoder: method, which modifies the attributes of the view to match the attributes stored in the nib file.

If your NSLog is only in initWithFrame , it won't be called if the view is loaded from a nib.