I recommend a simpler way: Do all your organization in the app delegate and create a singleton object version of it in each subclass. Then apply that to each level in your navigation controller sequentially.
So, you make an alteration. Send that data to the app delegate by sending the app delegate a message with the information required. That custom message sends it off to the root view controller. That root viewcontroller sets the property of the next one and so on.
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