App crashes on iPhone 5 when calling the Viewcontroller in delegate - ios

Question

I have a project that works well in other simulators including The New iPad. However, with the iPhone5, it crashes when calling the Viewcontroller in delegate
I don't know why this error happens. Please let me know if you discover any possible causes in the code below:
self.rootviewController = [[RootViewController alloc] initWithNibName:#"RootViewController" bundle:nil];
self.rootNavController = [[UINavigationController alloc]
self.rootNavController.navigationBar.hidden=YES;
[window addSubview:rootNavController.view];'
Please see image below:
Thank you very much

Answer 1

I think you do something wrong with the creation of your UINavigationController, try the following code to replace yours in your AppDelegate.m :
EDIT add code to display and remove splashscreen with UIViewController
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Create View Controller
RootViewController *rootViewController = [[RootViewController alloc] initWithNibName:#"RootViewController" bundle:nil];
// Create Navigation Controller
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:rootViewController];
// Create Navigation Controller
self.window.rootViewController = navigationController;
[self.window makeKeyAndVisible];
// SplashScreen
[self displaySplashscreen];
return YES;
}
#pragma mark - SplashScreen Methods
- (void)displaySplashscreen
{
// Create View
self.splashscreenViewController = [[SplashscreenViewController alloc] init];
// Display Splashscreen
[_window addSubview:_splashscreenViewController.view];
// Dismiss Splashscreen
[self performSelector:#selector(dismissSplashscreen) withObject:nil afterDelay:3.0f]; // Modify the time
}
- (void)dismissSplashscreen
{
// Splashscreen Animation
[UIView animateWithDuration:0.5f
animations:^{
_splashscreenViewController.view.alpha = 0.0f;
} completion:^(BOOL finished) {
[_splashscreenViewController.view removeFromSuperview];
}];
}