I have a view controller. I choose Editor->Embed In->Navigation Controller option. A navigation controller is added to storyboard and my view controller becomes root view controller. Besides, A Navigation Item is added at the top of my view controller.
On the other hand, we can put a navigation bar on view controllers and we can create forward backward transition between view controllers without navigation controller.
What is difference between navigation item and navigation bar ?
The navigation item manages the buttons (left and right) and views (mainly the title view) to be displayed in a navigation bar.
Each navigation item points to a specific view controller.
The navigation bar is the container for the navigation item and mainly handles layout, transitions and animations.
You can read more about them in the official docs:
https://developer.apple.com/documentation/uikit/uinavigationitem
https://developer.apple.com/documentation/uikit/uinavigationbar
Related
How do I create a "back" button on a View Controller that was initiated from a UITab Bar?
I am initiating the View Controller form the UI Tab Controller. How do I add a back button?
The short answer is "don't". Apples HIG (Human Interface Guidelines) say that when you use a tab bar controller, it should be the top-level navigational control of your app.
You could have one of the tabs contain a navigation controller, and that child view controller could have a navigation bar that includes a back button, but you should not have the tab bar controller be a child of a navigation controller.
If you wanted to violate Apples HIG and make the root level view controller be a navigation controller that contained a tab bar controller you could do that but it would make for a confusing interface. You'd make the root view controller of your app a navigation controller. Then one of the view controllers you pushed onto that navigation controller would be a tab bar controller. When you pressed the back button the navigation controller would pop that navigation controller off the stack and leave you with whatever view controller was under the tab bar controller.
I don't understand why SignIn and SignUp navigation Bar and the back buttons are not visible even when embedding both of these views in the navigation controllers.
Is there anything else we have to do in code. All top bars are inferred in this case and I haven't touched the visibility of any.
There is no back button because there is nowhere to go back to. Your sign up and sign in view controllers are the root view controllers of their respective navigation controllers.
There is no visible title because what you are looking at is the navigation item of the tab bar controller, which has no title.
Your architecture posits a navigation controller insider a navigation controller, which is illegal:
nav controller -> tab bar controller -> nav controller
You can't do that.
Also you can't put a tab bar controller inside a navigation controller. A navigation interface inside a tabbed interface is fine (as illustrate in Apple's own docs: https://developer.apple.com/documentation/uikit/uinavigationcontroller). The reverse, a tabbed interface inside a navigation interface, is not.
The simplest solution is to eliminate the first navigation controller completely, as there is no need for it (you are not pushing anything onto it beyond its root view controller).
IN SIMPLE TERMS
Logically, your Tabbar should not be embedded in a UINavigation Controller. Instead, delete the NavigationController and make the Tabbar the root Viewcontroller then embed each UIViewcontroller in a separate Navigation controller
I'm trying to display the navigation bar at the top of the screen, but it's not showing in embed navigation controller.
Here is how it is in the storyboard:
And here it's in the simulator:
As you can see, I created a custom TabBar (following this tutorial) at the bottom of the screen so I can navigate between the different views.
I believe that I'm going to have to load the navbar programatically because the only solution that I found was to set the navigation controller as the initial view controller, but I already set another view as the initial one so I can't do that.
Issue :
When you instantiate a viewController using storyBoard identifier they wont come with free embedded navigation controller, even if you have added a NavigationController to them. As a result you are adding a viewController without navigation bar to your tab bar VC.
Solutions:
Solution1: If you want each child viewControllers to carry their own navigation controller hence their own navigation stack, provide a storyboard identifier to Navigation Controller behind your child viewControllers and instantiate the Navigation controller itself rather than ViewController. And add NavigationController as you tab bar looking VC's child. Because navigation controller loads the embdedded VC by default you will see your child VC with nav bar.
Solution2: All that you care for is only nav bar than add the Navigation Controller behind the VC containing tab bar looking View.
Hope it helps
Have you tried constraining the navigation bar to your view? Otherwise it can move offscreen.
You need to point the tab bar controller segue to the navigation controller of your view - otherwise if you point the segue straight to the view you're just loading the view without any navigation controller attached.
I am trying to setup a Model View Controller to have a Navigation Bar just in the storyboard.
I have setup a segue from one view controller to another and marked it as Model.
I have changed the Model VC to have Top Bar : Translucent Navigation Bar.
I call the segue by name with the following:
[self performSegueWithIdentifier:#"testModel" sender:self];
When the model view controller shows up there is no Navigation Bar. Am I missing something that should make this show.
The Model View Controller is not actually in a Navigation Controller stack and shouldn't be as there is no movement other than dismiss from this Model View Controller. I am just trying to use the Navigation Bar to show a title for the model VC.
When you changed your view controller to "Top Bar : Translucent Navigation Bar.", that is under "Simulated Metrics". Changing that value tells Xcode that the view controller will have a navigation bar, it does not actually create a navigation bar. I suggest you either
Embed your view controller in a navigation controller (there is no rule that says you have to push anything from your navigation controller, and you might decide to add features in the future)
Use a toolbar instead of a navigation bar
Just use a label if all you want is a title on your view controller.
I am confused with behavior, I have Tab Bar Controller ( I enter on this controller from simple view controller which is embedded in navigation controller). I am confused why is that navigation bar from tab is covered up child navigation bar.
When I start app and I enter at Browse Controller I cannot see Browse title, neither nav bar items which I added programmatically. Can somebody give me clue what is wrong ( I am new to this, I connect with push segue from tab to browse).
Your problem appears to be the same as the one I addressed here:
Push segue from a view controller controlled by UITabBarController
What's happening is that your first NavigationController is creating a Navigation stack. Then you push-segue a TabViewController. That is added to the Nav stack, along with each of it's contained view controllers. However, when you PUSH SEGUE from one of those view controllers to some other view controller, the original navigation controller's stack is the one you are pushing on to. This is not contained inside the tab view controller, so the pushed view controller has no relationship with that tab view controller, just the original navigation controller stack. Therefore the tabs are not present.
The answer is to embed each of the tab controller's view controllers in a new navigation controller, and push on from those. The original navigation controller is just messing things up here...