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    <p>This is taken from one of my applications. As you say, you are not supposed to subclass <code>UINavigationController</code>, instead you use them as they are and you add viewcontroller on the <code>UINavigationController's</code>. Then after setting the root viewcontroller in each <code>UINavigationController</code>, you add the <code>UINavigationController</code> to the <code>UITabBarController</code> (phew!). </p> <p>So each tab will "point" to a <code>UINavigationController</code> which has a regular viewcontroller as root viewcontroller, and it is the root viewcontroller (the one you add) that will be shown when a tab is pressed with a (optional) navigationbar at top.</p> <pre><code> UITabBarController *tvc = [[UITabBarController alloc] init]; self.tabBarController = tvc; [tvc release]; // Instantiates three view-controllers which will be attached to the tabbar. // Each view-controller is attached as rootviewcontroller in a navigationcontroller. MainScreenViewController *vc1 = [[MainScreenViewController alloc] init]; PracticalMainViewController *vc2 = [[PracticalMainViewController alloc] init]; ExerciseViewController *vc3 = [[ExerciseViewController alloc] init]; UINavigationController *nvc1 = [[UINavigationController alloc] initWithRootViewController:vc1]; UINavigationController *nvc2 = [[UINavigationController alloc] initWithRootViewController:vc2]; UINavigationController *nvc3 = [[UINavigationController alloc] initWithRootViewController:vc3]; [vc1 release]; [vc2 release]; [vc3 release]; nvc1.navigationBar.barStyle = UIBarStyleBlack; nvc2.navigationBar.barStyle = UIBarStyleBlack; nvc3.navigationBar.barStyle = UIBarStyleBlack; NSArray *controllers = [[NSArray alloc] initWithObjects:nvc1, nvc2, nvc3, nil]; [nvc1 release]; [nvc2 release]; [nvc3 release]; self.tabBarController.viewControllers = controllers; [controllers release]; </code></pre> <p>This is how I go from one viewcontroller to another one (this is done by tapping a cell in a tableview but as you see the pushViewController method can be used wherever you want).</p> <p>(this is taken from another part of the app)</p> <pre><code>- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { if (self.detailedAnswerViewController == nil) { TestAnsweredViewController *vc = [[TestAnsweredViewController alloc] init]; self.detailedAnswerViewController = vc; [vc release]; } [self.navigationController pushViewController:self.detailedAnswerViewController animated:YES]; } </code></pre> <p>The <code>self.navigationcontroller</code> property is of course set on each viewcontroller which are pushed on the UINavigationController hierachy.</p>
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    1. COHow do you manage interactions between, say, PracticalMainViewController and PracticalSecondaryViewController? Key value observing?
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    2. COIn my case PracticalMainViewController is a UITableView where I in didSelectRowAtIndexPath pushes on a new viewcontroller with [self.navigationController push...]; Does this answer the question or do you mean how I pass data between them?
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    3. COAhhh. And it can provide a delegate or whatever. Clever. Thanks.
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