视图无法通过情节提要正确显示

我创建了一个基于页面的应用程序，该应用程序已经具有多个视图。RootViewController负责设置应用程序布局，除了一件事（视图大小）外，其他所有功能都做得很好。

这是我所拥有的一部分

    // Configure the page view controller and add it as a child view controller
    self.pageViewController = UIPageViewController(
        transitionStyle: .Scroll,
        navigationOrientation: .Horizontal,
        options: nil
    );

    self.pageViewController.delegate = self;

    // Setup the initial page
    let startingViewController = self.modelController.viewControllerWithProfileProvider(
        self.profileProviderPreference(),
        storyboard: self.storyboard
    );

    self.pageViewController.setViewControllers(
        [startingViewController as BrowsingViewControllerBase] as [AnyObject],
        direction: UIPageViewControllerNavigationDirection.Forward,
        animated: false,
        completion: { done in }
    );

    self.pageViewController.dataSource = self.modelController;
    self.addChildViewController(self.pageViewController);
    self.view.addSubview(pageViewController.view);

    // Set the page view controller's bounds using an inset rect so that self's view is visible around the edges of the pages
    self.pageViewController.view.frame = self.view.bounds;

    // Notify the page view controller that we just moved to it. This is a framework imposition. See the docs.
    self.pageViewController.didMoveToParentViewController(self);

    // Add the page view controller's gesture recognizers to the view controller's view so that the gestures are started more easily.
    self.view.gestureRecognizers = self.pageViewController.gestureRecognizers;

控制器中的所有其他代码都处理行为，而不处理方面，因此我使用Storyboard设置了其他所有内容。该viewControllerWithProfileProvider:方法返回正确的视图，该视图会显示在屏幕上，但显示不正确。这是我在情节提要中的内容：

然后，我根据给定的提供者（例如，Facebook，Twitter，LinkedIn ...）更改按钮的颜色和标签。但是我得到这个：

请注意该按钮如何关闭屏幕。我认为这self.pageViewController.view.frame = self.view.bounds;是关键所在，但是我不确定该使用什么。如何使我的视图正确显示？