一些UIViewControllers中的XAMARIN.IOS UITabBarController

问题描述

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，我想将自己创建的标签栏添加到其他视图中.反之亦然，当用户注销时，我想显示不带TabBar的连接视图.

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.

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

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();

如果我要不带TabBar的视图，则为appDelegate:

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

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

使用此TabController:

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/[email protected]");

            tab2 = new UINavigationController(new OViewController(1));
            tab2.Title = Texts.Categories;
            tab2.TabBarItem.Image = UIImage.FromFile("Icons/[email protected]");

            tab3 = new UINavigationController(new SearchViewController());
            tab3.Title = Texts.Search;
            tab3.TabBarItem.Image = UIImage.FromFile("Icons/[email protected]");

            tab4 = new UINavigationController(new BookmarkViewController(1));
            tab4.Title = Texts.Bookmarks;
            tab4.TabBarItem.Image = UIImage.FromFile("Icons/[email protected]");


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

            this.TabBar.BackgroundColor = UIColor.White;

            ViewControllers = tabs;
        }
    }

但是如何从具有TabBar的视图移动到没有视图的视图，反之亦然?

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

我不使用StoryBoard，而是在Xamarin.iOS上编写代码.

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

推荐答案

1. 按下时

1. When Push

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

出现时

When Present

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

首先将连接页面"设置为RootViewController，然后在需要时将其更改.

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

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

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

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