iPad 导航控制器在 splitview 弹出框架中的问题

Question

我将导航控制器作为分割视图根视图控制器。 当 iPad 处于纵向模式时，根视图控制器显示在弹出控制器内。默认情况下我知道......

但我的问题是根视图控制器的顶部似乎被弹出窗口隐藏了。请参阅附图。其中主页栏按钮似乎隐藏了顶部的一小部分。

 RootViewController *objRootViewController = [[RootViewController alloc] init];

    DetailViewController *objDetailViewController = [[DetailViewController alloc] init];


    UINavigationController *rootNavigationController = [[UINavigationController alloc] initWithRootViewController:objRootViewController];


    UINavigationController *detailNavigationController = [[UINavigationController alloc] initWithRootViewController:objDetailViewController];


    UISplitViewController *objSplitViewController = [[UISplitViewController alloc] init];
    [objSplitViewController setDelegate:objDetailViewController];


    [objSplitViewController setViewControllers:[NSArray arrayWithObjects:rootNavigationController,detailNavigationController, nil]];

    self.splitViewController = objSplitViewController;

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

    [objSplitViewController release];
    objSplitViewController = nil;

    [rootNavigationController release];
    rootNavigationController = nil;

    [detailNavigationController release];
    detailNavigationController = nil;

    [objDetailViewController release];
    objDetailViewController = nil;

    [objRootViewController release];
    objRootViewController = nil;