iOS Replacing a tab view with a new view

I have a tab view set up and working fine, with individual controllers for the views.

However, in one of the views, I want a button that is going to load a new view.

But! This view should not just replace the view of the tab. It should replace everything in the window, making the tab bar itself disappear.

I believe this is supposed to be achieved by UINavigationController in some way.

I started learning iPhone developing yesterday, so noobdetails are appreciated.


An illustration of what I want to achieve:

So now I have

My MainWindow and AppDelegate
This contains the navigation controller




ScheduleView - this is supposed to be view 2 of my navigation, and is illustrated in the original post right image (the "a new view")




TabViewController - this is supposed to be view 2 of my navigation, and is illustrated in the original post left image






And now I want that "Tillbaka" (Backwards) - button in ScheduleView to load the TabViewController view...

So in ScheduleViewController.m I have this code:




As you can see in the first image, I load my main window view from "ScheduleView"

But when I press the Tillbaka-button, I get:

Application tried to push a nil view controller on target <UINavigationController: 0x4b15a30>.


What am I missing?

EDIT:

aha, so I changed the button action a little bit:




and now I get a view atleast, although it's all white

gonna see if Im missing something in TabViewController





Edit 2

Still having problems, I don't get why my view and tab controller are separate from each other?

I figured it out.


What I did wrong was trying to have a NavigationView encapsule a TabView, because I wanted to get rid of the TabBar when I switched NavigationView.

However the correct way was to have a TabView encapsule a NavigationView, and then on switching to a new NavigationView, to set

self.hidesBottomBarWhenPushed = YES;


and then set it to NO when I switched back.

tutorial:
http://broadcast.oreilly.com/2009/06/tab-bars-and-navigation-bars-t.html