Custom view in a subclass of an NSObject class

I have an NSObject class, Adwindow where I set the frame of a view to begin at the top of the screen. In its subclass, I have to change the frame of that view as per my customization, to begin at 100 pts from the top of the screen. If it is possible, how can I achieve this is, in Objective c?

Any help is highly appreciated! Thank you!

Best to ask over at an Apple-specific forum, like the Apple Developer forums, StackOverflow, or elsewhere. The question is about Apple frameworks and Objective-C, not Swift.