Navigate from NavigationController to another NavigationController with a back button - ios

Question

Hello,
so i have this storyboard structure i have a button in ViewController B i need that button to point to the bottom NavigationController in which it has the ViewController C as rootViewController so when i press a button in ViewContoller B it takes me to C now i need a back button on C to take me back to B
i have tried looking but all of the reference materials show how to navigate between ViewController not NavigationControllers

Answer 1

I think you cannot push Navigation Controller inside another uinavigation controller but alternativaly you can present another nav controller.
Hope it works for you.
I have created simple demo like this.
class ViewController: UIViewController {
#IBOutlet weak var btnCustom: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
#IBAction func btnForward(_ sender: Any) {
/*Uncomment the code if you want to present programatically*/
/*if let navi2 = self.storyboard?.instantiateViewController(withIdentifier: "nav2"){
self.present(navi2, animated: true) {
}
}*/
}
}
class ViewController2: UIViewController {
#IBOutlet weak var btnCustom: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func btnBack(_ sender: Any) {
if let parentNav = self.navigationController {
parentNav.dismiss(animated: true) {
}
}
}}

Answer 2

You can use a single navigation controller, but overwrite the back buttons action.
By default it will pop the current view controller from the navigation stack and go to the previous one.
On the back action in VC B just push to the VC C, you can do this either in storyBoard by drag-drop from the back button to VC C or by code by writing:
self.navigationControlller.push(VC C)

Answer 3

If using 2 navigationControllers is a requirement that cannot be avoided, you can solve the problem statement in the following way.
In ViewControllerC on a UIButton's tap event, get the instance of ViewControllerB in the parent navigationController and pop to it like so,
#objc func backAction() {
let parentNav = self.navigationController?.navigationController
if let vcB = parentNav?.viewControllers.first(where: { $0 is ViewControllerB }) {
parentNav?.popToViewController(vcB, animated: true)
}
}
Add the backAction() to backButton's target like,
backButton.addTarget(self, action: #selector(backAction), for: .touchUpInside)

Answer 4

Put this code inside your C's viewController back button action method. Also you have to give identifiers names to your views in the storyboard screen.
...
//It possible to change between different storyboards, but in your case all the views share the same storyboard.
UIStoryboard* storyboardOfA_B = [UIStoryboard storyboardWithName: #"storyboardOfA_B" bundle:nil];
UINavigationController* navigationControllerOfA_B = [storyboardOfA_B instantiateViewControllerWithIdentifier:#"navigationControllerOfA_B"];
UIViewController* viewControllerB = [storyboardOfA_B instantiateViewControllerWithIdentifier:#"viewControllerB"];
//I'm supposing that you have the action method of the back button in the C's view controller so I use self.
UINavigationController* navigationControllerOfC = self.navigationController;
[navigationControllerOfC pushViewController: navigationControllerOfA_B animated:NO];
[navigationControllerOfA_B pushViewController: viewControllerB animated:NO];
...
Maybe this is not the best way but is a way