instantiateViewControllerWithIdentifier not calling ViewDidLoad

I'm using instantiateViewControllerWithIdentifier to get a viewController from Storyboard in order to assign it as a root viewController for a navigationController, so i do that:

self.welcomeView=(WelcomeView*)[self.storyboard instantiateViewControllerWithIdentifier:@"WelcomeView"];

and in order to set self.welcomeView as a root view controller for the navigation controller i do that:

[self.navigationController setViewControllers:@[self.welcomeView] animated:NO];

the problem is that ViewDidLoad of WelcomeView didn't called and as a result the rootViewController of the navigation controller appears blank, i don't know why this happens!