UISplitviewcontroller not as a rootview controller

Question

I am building my first iPad application. And one of my requirements is to deal with UISplitviewcontroller and UINavigationController.
our proposed view hierarchy is
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Answer 1

Modified Ryan CY's version with storyboard.

Put this code to login controller.
1. Set storyboard id of UISplitViewController to SplitViewController;
2. Set UISplitViewController delegate and save instance

UISplitViewController* splitController = [self.storyboard instantiateViewControllerWithIdentifier:@"SplitViewController"];
UINavigationController* navigationController = [splitController.viewControllers lastObject];
splitController.delegate = (id)navigationController.topViewController;

3. Change rootViewController after login

self.view.window.rootViewController = splitController;