小编Ali*_*eza的帖子

我有一个应用程序(Xamarin.IOS),它以一个没有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,当用户退出时,我想显示没有TabBar的连接视图.

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 …