Skip/Add a View Controller in Navigation Stack

Question

I have three View Controllers embedded in Navigation Controller. I want to go from VC1 to VC3 so that in VC3 the Navigation Item's back button would direct the user to VC2 instead of VC1. I think this should be done either by adding the VC2 to the Navigation Stack between VC1 and VC3 when VC3 is created or by skipping the second View Controller.

I tried this:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if let identifier = segue.identifier {
        switch identifier {
        case "JumpToThirdVCSegue":
            if let secondvc = segue.destinationViewController as? SecondViewController {
                secondvc.performSegueWithIdentifier("ThirdVCSegue", sender: self)
            }
        default: break
        }
    }
}

but I couldn't get it working. Perhaps performing a segue isn't possible when the View Controller isn't open yet?

What is the best way to skip a View Controller / add a View Controller in the middle of Navigation Stack? I hope this helps you to understand what I'm trying to do:

Answer 1

Something like this should work:

    self.navigationController?.pushViewController(viewController2, animated: true)
    self.navigationController?.pushViewController(viewController3, animated: true)

EDIT:

If you want to push the second view controller without being noticed by the user you need to add it to the navigation controller after the third view controller is pushed. This can be done by implementing UINavigationControllerDelegate. You can store your second view controller in a variable and insert it to the navigation controllers hierarchy in delegate method. Your main view controller will look like following:

class MyViewController: UIViewController, UINavigationControllerDelegate {

    var viewControllerToInsertBelow : UIViewController?

    override func viewDidLoad() {
        super.viewDidLoad()
        self.navigationController?.delegate = self
    }

    func pushTwoViewControllers() {
        if let viewController2 = self.storyboard?.instantiateViewControllerWithIdentifier("id1"),
            let viewController3 = self.storyboard?.instantiateViewControllerWithIdentifier("id2") { //change this to your identifiers
                self.viewControllerToInsertBelow = viewController2
                self.navigationController?.pushViewController(viewController3, animated: true)
        }
    }

    //MARK: - UINavigationControllerDelegate
    func navigationController(navigationController: UINavigationController, didShowViewController viewController: UIViewController, animated: Bool) {
        if let vc = viewControllerToInsertBelow {
            viewControllerToInsertBelow = nil
            let index = navigationController.viewControllers.indexOf(viewController)!
            navigationController.viewControllers.insert(vc, atIndex: index)
        }
    }

}

Answer 2

if var navstack = navigationController?.viewControllers{
                    navstack.append(contentsOf: [vc1,vc2])
                    navigationController?.setViewControllers(navstack, animated: true)
                }

Works well

Answer 3

Edit: using swift and segues, this should work:

override func performSegueWithIdentifier(identifier: String?, sender: AnyObject?) {
    super.performSegueWithIdentifier(identifier, sender: sender);

    if identifier == "JumpToThirdVCSegue" {
        // now the vc3 was already pushed on the navigationStack
        var navStackArray : [AnyObject]! = self.navigationController!.viewControllers
        // insert vc2 at second last position
        navStackArray.insert(viewController2, atIndex: navStackArray.count - 2)
        // update navigationController viewControllers
        self.navigationController!.setViewControllers(navStackArray, animated:false)
    }
}

So you override the performSegueWithIdentifier in the VC1 in order to change the navigation stack when the segue to VC3 has actually been performed (and is not only in preparation). This assumes, that you want to handle this special navigation logic in VC1.