Programmatically set rootViewcontroller for UINavigationcontroller in Storyboard in Appdelegate - objective-c

Question

I have a value in NSUserdefaults. I am using storyboard, it is embedded in UINavigationController.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
if([[NSUserDefaults standardUserDefaults]objectForKey:#"isLoggedIn"]){
//show home page here
}else{
// show login view
}
}
I can open the app using a URL also
- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url {
NSString *text = [[url host] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
if(text.length > 0){
// show home page
}else {
// show settings page
}
return YES;
}
How can I set the rootViewController for the UINavigationController based on the value that is retrieved .Can anyone please help me out?

Answer 1

You can create an object of UINavigationController with your ViewController as per if/else condition and set the navigation controller as rootViewController property of window in AppDelegate as follows:
LoginViewController *loginController = [[UIStoryboard storyboardWithName:#"MainStoryboard" bundle:nil] instantiateViewControllerWithIdentifier:#"loginController"]; //or the homeController
UINavigationController *navController = [[UINavigationController alloc]initWithRootViewController:loginController];
self.window.rootViewController = navController;

Answer 2

This is what i used in my code
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
// Get user preference
NSString * wxyz=[defaults stringForKey:#"wxyz"];
//Get value at wxyz field
if ([self isInValidwxyz:wxyz]) {
//check if wxyz is invalid
//If wxyz is invalid, write custom code
}
else{
//if valid,
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone){
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"myStoryBoardiPhone" bundle:nil];
self.window.rootViewController = [storyboard instantiateInitialViewController];
}
else{
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"myStoryBoardiPad" bundle:nil];
self.window.rootViewController = [storyboard instantiateInitialViewController];;
}
[self.window makeKeyAndVisible];
}
and then, go through this link for implementation with navigation controller