XAMARIN.IOS 某些 UIViewController 中的 UITabBarController

Question

我有一个应用程序 (Xamarin.IOS)，它以没有 TabBar 的 UIViewController（连接视图）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视图中。反之亦然，当用户注销时，我想显示没有 TabBar 的连接视图。

我知道当我想显示 TabBar 时，在 appDelegate 中，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 的视图，这里是 appDelegate:

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

使用此 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 的视图移动到没有 TabBar 的视图，反之亦然？

我不使用故事板，而是在 Xamarin.iOS 上编写代码。

Answer 1

Tab -> No Tab

推送时

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

存在时

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

No Tab -> Tab

先把Connection Page设置为RootViewController，以后想改就改。

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();
}

XAMARIN.IOS 某些 UIViewController 中的 UITabBarController

XAMARIN.IOS UITabBarController in some UIViewControllers

tabbar

uiviewcontroller

uinavigationcontroller

xamarin.ios

ios

Tab -> No Tab

No Tab -> Tab