问题
In continue of my question in this post, I want to post a complete question which will be a question lots of xamarin.ios developers.
My request is having TabBar in ALL UIViewControllers. So, as I know, there are two ways to realize it.
First :
appDelegate -> set RootViewController : TabController -> UVC1
in this case, I have NULL NavigationController and I'll have no navigationItem. and in
this.NavigationController.PushViewController(new SearchViewController(), true);
It makes error that NavigationController is null.
Here is my code in AppDelegate:
_tabController = new TabController(); _window.RootViewController = _tabController;
and my TabController :
public class TabController : UITabBarController {
UIViewController tab1, tab2, tab3, tab4;
public TabController()
{
tab1 = new HomeViewController();
tab1.TabBarItem.Image = UIImage.FromFile("Icons/Home.png");
tab2 = new TagCategoryViewController(null, null, 1, null);
tab2.TabBarItem.Image = UIImage.FromFile("Icons/Tag.png");
tab3 = new SearchViewController();
tab3.TabBarItem.Image = UIImage.FromFile("Icons/Search.png");
tab4 = new ProfileViewController();
tab4.TabBarItem.Image = UIImage.FromFile("Icons/Home.png");
var tabs = new UIViewController[] {
tab1, tab2, tab3,tab4
};
ViewControllers = tabs;
}
}
And the second way :
RootViewController -> navigationController -> TabController -> UVC1 -> new UVC2 -> no tab bar !!
Here, everything sounds good, but when I navigate to new UIViewController which is not present in Tabs, the TabBar will diappear !
And the code is :
_tabController = new TabController();
var navigationController = new UINavigationController(viewController);
_window.RootViewController = new UINavigationController(_tabController);
What can I do ? Any idea?
I don't use StoryBoard !
回答1:
By wrapping all your UIViewController
with UINavigationController
you can enable the behaviour you want, but make sure that you remove TabBarController
since the NavigationBar
will overlap the NavigationBar
from your Views.
_window.RootViewController = _tabController;
And your views:
tab1 = new UINavigationController(new HomeViewController());
tab1.TabBarItem.Image = UIImage.FromFile("Icons/Home.png");
来源:https://stackoverflow.com/questions/47175839/uitabbarcontroller-in-xamarin-ios-without-using-storyboard