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POObjective-C: Using self.navigationController with a Custom UINavigationController
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  1. POObjective-C: Using self.navigationController with a Custom UINavigationController
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    copied!<p>I have created a custom navigation controller which I call <code>CatalogueNavigationController</code>. This <code>CatalogueNavigationController</code> has a property called <code>currentLevel</code> which is of type <code>int</code>.</p> <p>On one of my view controllers that are presented within this navigation controller, I would like to get the <code>CatalogueNavigationController</code>'s <code>currentLevel</code> value. However, when I try to reference it with <code>self.navigationController.currentLevel</code>, I'm faced with an error that suggests that currentLevel isn't a property of <code>UINavigationController</code> - I know, it's part of <code>CatalogueNavigationController</code>.</p> <p>CatalogueNavigationController</p> <pre><code>// .h @interface CatalogueNavigationController : UINavigationController @property int currentLevel; // .m @implementation CatalogueNavigationController @synthesize currentLevel; </code></pre> <p>Initialising View Controller</p> <pre><code>CatalogueBrowser *catalogue = [[CatalogueBrowser alloc] initWithStyle:UITableViewStyleGrouped andQuery:nil]; CatalogueNavigationController *navigation = [[CatalogueNavigationController alloc] initWithRootViewController:catalogue]; navigation.modalPresentationStyle = UIModalPresentationFormSheet; [self presentModalViewController:navigation animated:YES]; </code></pre> <p>CatalogueBrowser View Controller</p> <pre><code>NSLog(@"%i",self.navigationController.currentLevel); //ERROR: Property 'currentLevel' not found on object of type 'UINavigationController *' </code></pre> <p>The currentLevel variable is decremented when a viewController is popped and incremented when a viewController is pushed, to allow me to keep track of 'how deep' into the navigation the user is. So I need to return it's current state.</p> <p>I could use Notifications to marry a variable on my view controller and on the CatalogueNavigationController, but surely there's a more elegant solution?</p> <p>How can I reference self.navigationController to return the value of <code>currentLevel</code>, but have it refer to the <code>CatalogueNavigationController</code> and not UINavigationController?</p>
 

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