侧边菜单未关闭 - Xamarin.iOS

Question

我正在尝试使用 component 和 example 在 Xamarin.iOS 中实现侧边菜单。 除了我要关闭侧边菜单的部分之外，一切正常。

现在它的工作原理是这样的：我可以使用 NavigationItem 中的 LeftButton 或手指滑动来打开侧边菜单。但是我不能用这两种方法中的任何一种来关闭它。

有人知道为什么会这样吗？我错过了什么？

另请参阅下面的代码。

主视图

public partial class HomeView : MvxViewController
{
    public HomeView() : base("HomeView", null)
    {
    }

    public override void ViewDidLoad()
    {
        base.ViewDidLoad();
        // Perform any additional setup after loading the view, typically from a nib.

        CGRect screenRect = UIScreen.MainScreen.Bounds;
        NavigationController.View.Frame = new CGRect(0, 0, screenRect.Width, screenRect.Height);

        var app = UIApplication.SharedApplication.Delegate as AppDelegate;
        NavigationItem.SetLeftBarButtonItem(
            new UIBarButtonItem(UIImage.FromBundle("menu"),
                                UIBarButtonItemStyle.Plain, (sender, e) =>
                                {
                                    app.SidebarController.ToggleMenu();
                                }), true);
    }

根视图

public partial class RootView : MvxViewController
{
    public RootViewModel RootViewModel
    {
        get { return (RootViewModel)ViewModel; }
        set { ViewModel = value; }
    }

    public RootView() : base("RootView", null)
    {
    }

    public override void ViewDidLoad()
    {
        base.ViewDidLoad();
        // Perform any additional setup after loading the view, typically from a nib.

        if (ViewModel == null)
            return;

        var app = UIApplication.SharedApplication.Delegate as AppDelegate;
        app.SidebarController = new SidebarController(this,
                                                  CreateViewFor(RootViewModel.Home, false), CreateViewFor(RootViewModel.Menu, true));
        app.SidebarController.MenuWidth = 220;
        app.SidebarController.ReopenOnRotate = false;
        app.SidebarController.MenuLocation = MenuLocations.Left;
    }

    public override void DidReceiveMemoryWarning()
    {
        base.DidReceiveMemoryWarning();
        // Release any cached data, images, etc that aren't in use.
    }

    private UIViewController CreateViewFor(IMvxViewModel viewModel, bool navBarHidden)
    {
        var controller = new UINavigationController();
        var screen = this.CreateViewControllerFor(viewModel) as UIViewController;
        controller.PushViewController(screen, false);
        controller.NavigationBarHidden = navBarHidden;
        return controller;
    }

Answer 1

我设法通过在 RootView.cs 的 ViewDidLoad() 中添加以下行来修复奇怪的行为：

View.Frame = new CGRect(0, 0, 0, 0);

由于某种原因，来自 RootViewController 的视图看起来高于其他两个视图，这是我设法使其工作的唯一方法。如果有人有更好的解决方案，请添加您的答案，我会尝试。我所做的看起来更像是一种解决方法。

@HeisenBerg 我们的项目之间有一个区别，我使用的是 MVVMCross，它会更多地改变屏幕之间的流程。不过谢谢你的帮助！

Answer 2

这就是我在我的应用中实现侧边栏导航的方式，并且效果很好。

RootViewController.cs

public class RootViewController : UIViewController
{
    UIStoryboard _storyboard;

    // the sidebar controller for the app
    public SidebarController LeftSidebarController { get; private set; }

    // the navigation controller
    public NavigationController NavController { get; private set; }

    // the storyboard
    public override UIStoryboard Storyboard {
        get {
            if (_storyboard == null)
                _storyboard = UIStoryboard.FromName ("Main", null);
            return _storyboard;
        }
    }

    public RootViewController () : base (null, null)
    {

    }

    public override void ViewDidLoad ()
    {
        base.ViewDidLoad ();

        var programController = (CareProgramController)Storyboard.InstantiateViewController ("careProgramController"); // This is the menu..
        var leftMenuController = (LeftMenuController)Storyboard.InstantiateViewController ("leftMenuController"); // This is the initial ViewController
        NavController = new NavigationController ();
        NavController.PushViewController (programController, false);
        LeftSidebarController = new SidebarController (this, NavController, leftMenuController) {
            HasShadowing = false,
            MenuWidth = 280,
            MenuLocation = MenuLocations.Left
        };
    }
}

BaseViewController.cs

public class BaseViewController : UIViewController
{

    // provide access to the sidebar controller to all inheriting controllers
    protected SidebarNavigation.SidebarController SidebarController {
        get {
            return (UIApplication.SharedApplication.Delegate as AppDelegate).RootViewController.LeftSidebarController;
        }
    }

    // provide access to the navigation controller to all inheriting controllers
    protected NavigationController NavController {
        get {
            return (UIApplication.SharedApplication.Delegate as AppDelegate).RootViewController.NavController;
        }
    }

    // provide access to the storyboard to all inheriting controllers
    public override UIStoryboard Storyboard {
        get {
            return (UIApplication.SharedApplication.Delegate as AppDelegate).RootViewController.Storyboard;
        }
    }

    public BaseViewController (IntPtr handle) : base (handle)
    {
    }


    public override void ViewDidLoad ()
    {
        base.ViewDidLoad ();
        SetupNavigationBar ();
        SetDrawerToogle ();
    }

    void SetupNavigationBar ()
    {
        if (NavController != null) {
            NavController.NavigationBar.BarTintColor = AZConstants.PrimaryColor;
            NavController.NavigationBar.Translucent = false;
            NavController.NavigationBar.TintColor = UIColor.White;
            NavController.NavigationBar.BarStyle = UIBarStyle.Black;
        }
    }

    void SetDrawerToogle ()
    {
        NavigationItem.SetLeftBarButtonItem (
            new UIBarButtonItem (UIImage.FromFile ("ic_menu_white.png").ImageWithRenderingMode (UIImageRenderingMode.AlwaysOriginal)
                , UIBarButtonItemStyle.Plain
                , (sender, args) => {
                    SidebarController.ToggleMenu ();
                }), true);
    }
}

现在我的应用程序中的所有 ViewControllers 都从 BaseViewController 扩展，所以它会有一个导航抽屉

AppDelegate.cs

public class AppDelegate : UIApplicationDelegate
{
    // class-level declarations

    public RootViewController RootViewController { get { return Window.RootViewController as RootViewController; } }

    public override UIWindow Window
    {
        get;
        set;
    }

    public override bool FinishedLaunching(UIApplication application, NSDictionary launchOptions)
    {
        // Override point for customization after application launch.
        // If not required for your application you can safely delete this method
        UIApplication.SharedApplication.SetStatusBarStyle(UIStatusBarStyle.LightContent, true);

        GotoRootViewController();
        return true;
    }

    public void GotoRootViewController()
    {
        Window = new UIWindow(UIScreen.MainScreen.Bounds);
        //Window.RootViewController.DismissViewController(true, null);
        //If you have defined a root view controller, set it here:
        Window.RootViewController = new RootViewController();

        // make the window visible
        Window.MakeKeyAndVisible();
    }