55623

Changing rootviewcontroller for navigation controller dynamically

Question:

I'm trying to change RootViewController for NavigationController in didFinishLaunchingWithOptions.<br /> But I don't know how can I do that.

I have gone through this link as well:<br /><a href="http://starterstep.wordpress.com/2009/03/05/changing-a-uinavigationcontroller%E2%80%99s-root-view-controller/" rel="nofollow">http://starterstep.wordpress.com/2009/03/05/changing-a-uinavigationcontroller%E2%80%99s-root-view-controller/</a>

Here is my code in didFinishLaunchingWithOptions:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; UIViewController *rootController=[[HomePageController alloc] initWithNibName:@"HomePageController" bundle:nil]; navigationController=[[UINavigationController alloc] initWithRootViewController:rootController]; // presentation=[[PresentationController alloc]initWithNibName:@"PresentationController" bundle:nil]; // // navigationController=[[UINavigationController alloc]initWithRootViewController:presentation]; // // presentationList=[[PresentationListController alloc]initWithNibName:@"PresentationListController" bundle:nil]; // // UINavigationController *listnavigation = [[UINavigationController alloc] initWithRootViewController:presentationList]; // // revealer=[[ZUUIRevealController alloc]initWithFrontViewController:navigationController rearViewController:listnavigation]; [self.window addSubview:navigationController.view]; [self.window makeKeyAndVisible]; return YES; }

Right now I comment and then run application to change rootviewcontroller. However this is not the practical approach.

Any help will be appreciated.

Answer1:

Instead of this:

[self.window addSubview:navigationController.view];

Put this:

self.window.rootViewController = navigationController;

Answer2:

A navigation controller does not care what type of view controller is its root view controller, as long as it is a subclass of UIViewController. So you can just use a pointer to a UIViewController like so:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { UIViewController *rootController = nil; if (iWantHomePageController) { rootController = [[HomePageController alloc] initWithNibName:@"HomePageController" bundle:nil]; } else if (iWantPresentationController) { rootController = [[PresentationController alloc] initWithNibName:@"PresentationController" bundle:nil]; } else if (iWantPresentationListController) { rootController = [[PresentationListController alloc] initWithNibName:@"PresentationListController" bundle:nil]; } UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:rootController]; self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; self.window.rootViewController = navController; [self.window makeKeyAndVisible]; return YES; }

Answer3:

This works really just fine for me:

self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; /* both *navigationController and *viewController are declared as properties in the .h file */ [self setViewController:[[[RootViewController alloc] initWithNibName:@"RootViewController" bundle:nil] autorelease]]; [self setNavigationController:[[[UINavigationController alloc] initWithRootViewController:self.viewController]autorelease]]; [self.window setRootViewController:[self navigationController]]; [self.window makeKeyAndVisible];

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