how to change the rootviewcontroller - iphone

Question

I want to change the rootViewController after the authenticationViewController
-(IBAction)LoginButtonPushed:(id)sender {
if ([(VerifyId)isEqual:#"C"]){
CondidatsViewController *condidatsViewController = [[[CondidatsViewController alloc]initWithNibName:#"CondidatsViewController" bundle:nil]autorelease];
UINavigationController *navController = self.navigationController;
NSMutableArray *controllers = [[self.navigationController.viewControllers mutableCopy] autorelease];
[controllers removeLastObject];
navController.viewControllers = controllers;
[navController pushViewController:condidatsViewController animated: YES];
} else {
RecruteursViewController *recruteursViewController = [[[RecruteursViewController alloc]initWithNibName:#"RecruteursViewController" bundle:nil]autorelease];
UINavigationController *navController = self.navigationController;
NSMutableArray *controllers = [[self.navigationController.viewControllers mutableCopy] autorelease];
[controllers removeLastObject];
navController.viewControllers = controllers;
[navController pushViewController:recruteursViewController animated: YES];
}
}
this code is when i press in login button i want CondidatsViewController or RecruteursViewController will be the rootView
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
AcceuilViewController *viewController =[[[AcceuilViewController alloc]
initWithNibName:#"AcceuilViewController" bundle:nil]autorelease];
self.navController = [[[UINavigationController alloc]initWithRootViewController:viewController]
autorelease];
self.window.rootViewController = self.navController;
[self.window makeKeyAndVisible];
return YES;
}

Answer 1

You can try UINavigationController's following method with a new array of desired view controllers something like
[self.navigationController setViewControllers:#[newRootViewControllerInstance, secondVCInstanceIfRequired, thirdVC-and-so-on....] animated:NO];
It will do the trick ;)

Answer 2

How about have a view controller one level above your nav and auth view controllers? This view controller can check for a valid session and push whatever view is appropriate on top of the stack. It seems ill advised to try to change your root view controller.
Edit: More details
You have a root view controller that doesn't have a view tied to it like most other view controllers might. You set this class as the root view controller in your app delegate.
App Delegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
RootViewController *rootViewController = [[RootViewController alloc] init];
self.window.rootViewController = rootViewController;
[self.window makeKeyAndVisible];
return YES;
}
In your root view controller you can determine if you have a valid session or not. Based on that, you can render the appropriate view.
RootViewController.m
#interface RootViewController ()
#end
#implementation RootViewController
- (void)viewDidLoad
{
[super viewDidLoad];
BOOL isUserAuthenticated = [MyClasskToFigureOutIfUserIsAuthenticated isUserAuthenticated];
if(isUserAuthenticated == NO) {
AuthViewController *vcAuth = [[AuthViewController alloc] init];
[self addChildViewController:vcAuth];
[self.view addSubView:vcAuth.view];
} else {
//they are authenticated so push your other view controller.
}
}
#end
This is pretty rough, but it should point you in the right direction.