How to add UINavigationBar prompt in RootViewController of UISplitviewcontroller

How i can dynamically show UINavigationBar promp in RootViewController of UISplitviewcontroller

Like : In my app delegate

// having UINavigationController inside
UISplitViewController *recentEntrySplitViewConntroller;

NSArray *array = [NSArray arrayWithObjects:recentEntrySplitViewConntroller,controller2, nil];
tabBarController = [[UITabBarController alloc] init];

[self.window addSubview:[tabBarController view]];

so In viewDidLoad of RootViewController in开发者_如何转开发side UINavigationController of recentEntrySplitViewConntroller, how can i show UINavigationBar promp

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self.navigationItem.prompt = @"My Prompt";