uisplitViewController的问题

Question

iOS 5.1上的“新”UISplitViewController存在问题。

我激活了UISplitViewController.presentsWithGesture，但它确实无效。

它只能工作一次，然后我必须改为水平视图。

public override bool FinishedLaunching (UIApplication app, NSDictionary options)
    {
        // create a new window instance based on the screen size
        window = new UIWindow (UIScreen.MainScreen.Bounds);

        // load the appropriate UI, depending on whether the app is running on an iPhone or iPad
        navigationController = new RootNavigationController();
        detailViewController = new DetailViewController ();
        detailViewController.HeaderView.Hidden=true;
        navigationController.RootViewControllers[1].DetailVaiewController=detailViewController;
        navigationController.DetailView=detailViewController;
        splitDelegate = new SplitViewDelegate();

        var prefs = NSUserDefaults.StandardUserDefaults;

        String AutoUpdate= prefs.StringForKey("autoUpdate");    

        if(AutoUpdate=="Yes"){
            navigationController.StartUpdate(true);
        }

        if (UIDevice.CurrentDevice.UserInterfaceIdiom == UIUserInterfaceIdiom.Phone) {
            window.RootViewController = navigationController;
        } 
        else {

            splitViewController = new SplitViewController ();                       
            splitViewController.WeakDelegate = detailViewController;


            splitViewController.ViewControllers = new UIViewController[] {
                navigationController,
                detailViewController                    
            };

            splitViewController.Delegate=splitDelegate;
            window.RootViewController = splitViewController;
        }

        window.MakeKeyAndVisible ();


        return true;

    }


    class SplitViewController:UISplitViewController{

        public SplitViewController():base(){


        }




    }


    class SplitViewDelegate:UISplitViewControllerDelegate{

        public SplitViewDelegate():base(){


        }



        public override void WillShowViewController (UISplitViewController svc, UIViewController aViewController, UIBarButtonItem button)
        {
            // TODO: Implement - see: http://go-mono.com/docs/index.aspx?link=T%3aMonoTouch.Foundation.ModelAttribute
            Console.WriteLine("Show");

        }

        public override void WillHideViewController (UISplitViewController svc, UIViewController aViewController, UIBarButtonItem barButtonItem, UIPopoverController pc)
        {
            // TODO: Implement - see: http://go-mono.com/docs/index.aspx?link=T%3aMonoTouch.Foundation.ModelAttribute
            Console.WriteLine("Hide");




        }
        public override void WillPresentViewController (UISplitViewController svc, UIPopoverController pc, UIViewController aViewController)
        {

            Console.WriteLine("Will Present");
        }


    }