How do I get NavigationController functionality without subclassing?

So my app's core is a tab bar. In each of 3 tabs is a UINavigationController subclass. Each one has a different type of table in it, which when a row is tapped, a detail is shown etc.

I currently have a 3 separate subclasses of UINavigationController, one for each tab. Then when a new tab is pressed, the table's controller is pushed.

I just read that you're not supposed to subclass UINavigationController. I'm not overriding any of UINavigation Controller's functionality, but I am overriding it's UIViewController functionality in viewDidLoad. Honestly that's just about it. It seems pretty silly, but Im unclear on how to get the Navigation Controller functionality without subclassing the way I have.

So how am i supposed to have a UINavigationController that I don't subclass? What is the approach that you're supposed to take to switch out the views when a tab is selected?

I'm pretty much a noob. Will Apple reject my app for subcalssing UINavigationController if im only overriding viewdidload?

I've heard folks say not to subclass UINavigationController, and instead 'present it modally.' I have used modal presentation a little bit, but I 开发者_JAVA技巧honestly dont' quite get how it would apply...

Thanks for your help!

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What are you doing in viewDidLoad? What about do it in root view controller, not in navigation controller?

P.S. I think Apple will not reject your app for subclassing UINavigationController.

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You should use categories to add extra functionality like that. It would look something like this:

@implementation UINavigationController (CustomViewDidLoad)

- (void)viewDidLoad
{
    //code goes here
}

@end

You can add this to the bottom of the file that initializes the navigationcontroller

More info about categories (at the bottom): http://cocoadevcentral.com/d/learn_objectivec/