XAMARIN.IOS UITabBarController in some UIViewControllers

问题

I have an application (Xamarin.IOS) which start with a UIViewController (Connection view) with no TabBar. But when user Logged, I'd like to add the tabbar that I've created to other views. And vis-versa, when user logged out, I'd like to display the connection view without TabBar.

I know that when I want to display the TabBar, in appDelegate, I have to initialize _window like this :

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

and if I want to have a view without TabBar, here is appDelegate:

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

with this 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;
        }
    }

But how can I move from a view with TabBar to a view without and vis-versa ?

I don't use StoryBoard and I code on Xamarin.iOS.

回答1:

Tab -> No Tab

1. When Push

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

2. When Present

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

No Tab -> Tab

Set Connection Page as RootViewController at first, and then change it when you want to.

Code:

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();
    }
}

And change it in Connection Page

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

来源：https://stackoverflow.com/questions/47182764/xamarin-ios-uitabbarcontroller-in-some-uiviewcontrollers