Multi layer table view/navigation controller hierarchy best practice

Hi,
I am new to iPad/iPhone development and wondering what the best practice for multiple layers of table views is? I understand the principle of a navigation controller providing the framework for moving up and down a list but have not yet quite got my head around if you should have one navigation controller for the whole tree or several navigation controllers.
In my app I need to have the following:
Main view -> window view showing some interactive elements (picker, buttons etc.)
Setup view -> Hierarchy managed by nav controller/table views
The setup view needs to manage the following hierarchy...
- Level A:
- Global app variables (one table view)
- Level B Items (table view showing list of items at belonging to Level B)
- Level B Item 1 (table view showing list of items at level C belonging to level B item 1)
- Level C Item 1 (table view showing list of items at level D belonging to level C item 1)
- Level D Item 1 (table view showing list of items at level E belonging to level D item 1)
- Level E item (table view for properties of item at Level E)
- Level D Item n
- Level C Item n
- Level B Item n
Each level in this has some properties and then a list of child items.
What would be the best way of structuring this? I would assume that creating a class that extends a view controller for each level is a given but what about the control of the navigation? Should this be handled by one navigation controller or one per level? I think I know the right answer but have not seen a neat way of implementing
I think I am also best off having each level in it's own xib but, once again, am not 100% sure that this is the best design pattern.
Many thanks in advance for any help/pointers!
Cheers
jez

Hi Julian,
I have struggled with the same questions you are addressing. On a previous project we tried to model based on packages, but during the course of the project we encountered some problems that grew overtime. The main problems were:
1. It is hard to enforce rules on package assignments
2. With multiple developers on the project and limited time we didn't have time to review package assignment
3. Devopelers would click away warnings that an object was already part of another project and just continue
4. After go-live the maintenance partner didn't care.
So, my experience is is that it is a nice feature, but only from a high level design point of view. In real life it will get messy and above all, it doesn't add much value to the development. On my neew assignment we are just working with packages based on functional area and that works just fine.
Roy

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m_userName wrote:
The user is able to select table values in the detail controller, which should update the parent controller when, and only when, the detail view is popped and the parent view is made visible again.
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That said, [viewDidDisappear:|http://developer.apple.com/library/ios/documentation/UIKit/R eference/UIViewControllerClass/Reference/Reference.html#//appleref/doc/uid/TP40006926-CH3-SW20] is called during that interval, so I think it would be a good choice for the requirement you described:
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The test for a nil navigationController pointer tells us whether the controller is actually off the stack when viewDidDisappear: runs. This is useful in case an instance of this controller class ever pushes another controller on top of it, since viewDidDisappear: will run in that situation as well. But in that case the controller doing the pushing remains on the stack, so its navigationController property won't be nil. If that property is nil when viewDidDisappear: runs, we know self has just been popped.
You can also find the above example in [Problem with text in detailTextLabel of UITableViewCell |http://discussions.apple.com/message.jspa?messageID=12495708#12495708], so if you build the code in that thread you can see how things work together.
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