Multiple view controllers on screen at once?

Question

I am trying to wrap my head around controllers in Cocoa Touch. The main problem is that I would like to have more than one controller “on screen” at once – I want to have a

Answer 1

This is a pretty old question, but since I guess there are people who might face the same problem today I'd like to share my solution. I was writing this application that had this one screen with a lot of information, pagination, controls etc. Since according to Apple's MVC documentation on the role of ViewControllers, you should not implement the logic in view itself, or access the data model directly from it, I had to choose between having a Massive ViewController with a few thousand lines of code which was both hard to maintain and debug(even with unit tests) or find a new way.

My solution was to use UIContainerView like below:

this way, you can implement each part's logic in it's own ViewController, and the parent view controller takes care of constraints and sizing of the views.

Note: This answer is just a guide to show the way, you can find a good and detailed explanation on how it works and how to implement it HERE