I just finished reproducing for myself the tutorial posted by zcarter here:
Easy Tutorial on Switching Views
If I understand correctly, the entire setup creates a heirarchy of Views all under one ViewController.
I then wanted to add a PickerView to one of my views. It seems that the way to implement a PickerView is to have a UIViewController that implements the UIPickerViewDelegate. That's where I got stuck. How would I have one of my buttons in the views change my window to an entirely new ViewController? This isn't specific to a PickerView either, I have the same question regarding navigating to any of the other types of View Controllers.