ios - 某些 UIViewController 中的 XAMARIN.IOS UITabBarController

Question

我有一个应用程序 (Xamarin.IOS)，它以没有 TabBar 的 UIViewController(连接 View )开头。但是当用户登录时，我想将我创建的标签栏添加到其他 View 中。反之亦然，当用户注销时，我想显示没有 TabBar 的连接 View 。

我知道当我想在 appDelegate 中显示 TabBar 时，我必须像这样初始化 _window :

_tabController = new TabController();
_window.RootViewController = _tabController;
_window.MakeKeyAndVisible();

如果我想要一个没有 TabBar 的 View ，这里是 appDelegate:

viewController = new ConnectionViewController();
_window.RootViewController = new UINavigationController(viewController);
_window.MakeKeyAndVisible();

使用这个 TabController :

public class TabController : UITabBarController
    {

        UIViewController tab1, tab2, tab3, tab4;

        public TabController()
        {
            tab1 = new UINavigationController(new ListViewController());
            tab1.Title = Texts.Home;
            tab1.TabBarItem.Image = UIImage.FromFile("Icons/Home@2x.png");

            tab2 = new UINavigationController(new OViewController(1));
            tab2.Title = Texts.Categories;
            tab2.TabBarItem.Image = UIImage.FromFile("Icons/Tag@2x.png");

            tab3 = new UINavigationController(new SearchViewController());
            tab3.Title = Texts.Search;
            tab3.TabBarItem.Image = UIImage.FromFile("Icons/Search@2x.png");

            tab4 = new UINavigationController(new BookmarkViewController(1));
            tab4.Title = Texts.Bookmarks;
            tab4.TabBarItem.Image = UIImage.FromFile("Icons/Favorite@2x.png");


            var tabs = new UIViewController[] {
                tab1, tab2, tab3, tab4
            };

            this.TabBar.BackgroundColor = UIColor.White;

            ViewControllers = tabs;
        }
    }

但是我怎样才能从有 TabBar 的 View 移动到没有 TabBar 的 View ，反之亦然？

我不使用 StoryBoard，而是在 Xamarin.iOS 上编写代码。

Answer 1

Tab -> No Tab

1. 推送时

   ViewController2 vc2 = new ViewController2();
   vc2.HidesBottomBarWhenPushed = true; //add this line
   this.NavigationController.PushViewController(vc2, true);
   

2. 存在时

   this.PresentViewController(new ViewController2(), true, null);
   

No Tab -> Tab

先把Connection Page设置成RootViewController，以后想改的时候再改。

代码:

public partial class AppDelegate : UIApplicationDelegate
{
    UIWindow window;

    public override bool FinishedLaunching (UIApplication app, NSDictionary options)
    {
        window = new UIWindow (UIScreen.MainScreen.Bounds);

        window.RootViewController = new UINavigationController(new ViewController1());
        window.MakeKeyAndVisible();
        return true;
    }

    public void changeRootVC()
    {
        window.RootViewController = new TabController();
    }
}

并在 Connection Page 中更改它

if(connected){
     AppDelegate app = UIApplication.SharedApplication.Delegate as AppDelegate;
     app.changeRootVC();
}