Pushing a navigation controller is not supported- performing segues

Question

I created a new navigation controller in my storyboard (not programmatically!) and set it to be \"Root View Controller\" to a regular UIViewController and added a button in

Answer 1

I've tried this and have no problems, its all done in IB with no additional code required ...

1. Start a new project, "Single View Application" using story boards
2. Select storyboard and delete the views its produced.
3. Drag on a new Navigation Controller (it will bring a table view with it)
4. Delete the table and the table view controller, so you are just left with the Navigation Controller
5. Drag on a normal view controller
6. Right Click and drag from the Navigation controller to the new View and choose "Relationship - Root View Controller"
7. Drag a "Bar Button Item" on to the Navbar which should be visible on the top of your ViewController, you can rename this Forward if you wish.
8. Now drag on another view controller which is the one your "Forward" button will push in to view.
9. Right Click and drag from the bar button to the 2nd View Controller, and choose "Push"

Run the project and you will get a Single view with a Navbar and your button, clicking your button will Push the other view and give you a Back Button to return to the first View Controller. I'll try and post a picture of my storyboard if it helps.

Plasma

Answer 2

I had the same trouble. I wanted to have a navigation controller on each storyboard, so that each could run independently, be individually debugged, and so that the look would be right with the navigation bar.

Using other approaches, I found the UINavigationController would be retained from the original storyboard -- which I didn't want -- or I'd get errors.

Using the AppDelegate in your view controller to set the rootViewController worked for me (borrowing segue naming conventions from Segue to another storyboard?):

- (void)showStartupNavigationController {
NSLog(@"-- Loading storyboard --");

//Get the storyboard from the main bundle.
UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"Startup" bundle:nil];
//The navigation controller, not the view controller, is marked as the initial scene.
UINavigationController *theInitialViewController = [storyBoard instantiateInitialViewController];

NSLog(@"-- Loading storyboard -- Nav controller: %@", theInitialViewController);

//Remove the current navigation controller.
[self.navigationController.view removeFromSuperview];
UIWindow *window = [(AppDelegate *)[[UIApplication sharedApplication] delegate] window];
window.rootViewController = theInitialViewController;

Answer 3

To swap views Programatically you would need to select the segue and give it an Identifier like "PushView" then call it like this ....

[self performSegueWithIdentifier:@"PushView" sender:self];

That will programatically do the same as clicking the forward button. I've created you an example project with the code discussed above. Has an -(IBAction) with code in you can use for programatially changing the view.

PushView.zip

Answer 4

I also wanted to do this, present a screen (that had an embedded navigation controller) when the user pushes a button.

At my first attempt, I connected the segue from the button in the fist screen to the Navigation Controller, and the app was crashing with this error "Pushing a navigation controller is not supported".

This is the solution I found:

Select the segue from the button in the first screen to the navigation controller. If it had an identifier, copy its name. Then delete that segue.

Then create a new segue by CTRL-clicking the button in the first view controller and dragging to the VIEW CONTROLLER YOU WANT TO PRESENT (not to the Navigation Controller that is pointing at it), and select Push in the small pop up window.

Then click the icon in the middle of the segue and paste the name you copied in the first step as an identifier for it.

IB is going to give you a warning "Scene is unreachable due to lack of entry points and does not have an identifier for runtime access via -instantiateViewControllerWithIdentifier:." Don't worry, it works perfectly.

If you want to customize the string that is shown as the Back button to return, you can add this line in the viewDidLoad method OF THE VIEW CONTROLLER THAT IS BEING SHOWED AFTER THE BUTTON IS PRESSED, that is the Child view controller.
(replace "Settings" with the name you need)

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.navigationController.navigationBar.topItem.title = @"Settings";
    ...

}