I have issue to remove ViewController from Navigation stack?

Question

I have 5 VC's, I'm successfully removing ViewController from navigation stack. But the problem is when click back button on navigation, it's moving into previous VC and it's showing removed VC on navigation bar.

Ex: I have 5 VC's: VC1, VC2, VC3, VC4, VC5.

Now I'm navigating from VC1 -> VC2, ..... VC4 -> VC5. And I have custom navigation bar back button title. Here I'm removing VC4 from stack.

When click back button in VC5 it's directly moving into VC3. But navigation bar is VC4. When click navigation bar once again now it's displaying VC3 navigation bar in same VC.

HOW TO resolve this issue. I want to display directly VC3 and vc3 navigation bar in single click.

Code to remove VC from Navigation stack:

guard let navigationController = self.navigationController else { return }
var navigationArray = navigationController.viewControllers // To get all UIViewController stack as Array
navigationArray.remove(at: navigationArray.count - 2) // To remove previous UIViewController
self.navigationController?.viewControllers = navigationArray

I'm doing about the same things. See this for your ref. I'm not creating custom back button. Built in back button works. — beshio
– beshio, Commented Sep 24, 2019 at 11:41

Sahil Manchanda · Accepted Answer · 2019-09-24 09:34:42Z

3

Use the following:

navigationController?.setViewControllers(navigationArray!, animated: true)

E.g.

guard let navigationController = self.navigationController else { return } 
var navigationArray = navigationController.viewControllers 
navigationArray.remove(at: navigationArray.count - 2) 
navigationController.setViewControllers(navigationArray!, animated: true)

From the docs:

Use this method to update or replace the current view controller stack without pushing or popping each controller explicitly. In addition, this method lets you update the set of controllers without animating the changes, which might be appropriate at launch time when you want to return the navigation controller to a previous state.

If animations are enabled, this method decides which type of transition to perform based on whether the last item in the items array is already in the navigation stack. If the view controller is currently in the stack, but is not the topmost item, this method uses a pop transition; if it is the topmost item, no transition is performed. If the view controller is not on the stack, this method uses a push transition. Only one transition is performed, but when that transition finishes, the entire contents of the stack are replaced with the new view controllers. For example, if controllers A, B, and C are on the stack and you set controllers D, A, and B, this method uses a pop transition and the resulting stack contains the controllers D, A, and B.

Edit 1

When you are pushing VC5, use the following code

let vc = YourVC5()
var array = navigationController?.viewControllers
array?.removeLast()
array?.append(vc)
navigationController?.setViewControllers(array!, animated: true)

The idea is when you push VC5 into stack, before pushing we are excluding VC4 from the list thus it will have VC3 beneath VC5 by default and you just need to call the navigationController?.popViewController(animated: true) and it should pop directly to VC3

edited Sep 24, 2019 at 9:34

answered Sep 24, 2019 at 9:10

Sahil Manchanda

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9 Comments

Naresh Over a year ago

Difference between these two Lines ... self.navigationController?.viewControllers = navigationArray

Naresh Over a year ago

No use..

guard let navigationController = self.navigationController else { return }             var navigationArray = navigationController.viewControllers             navigationArray.remove(at: navigationArray.count - 2)             self.navigationController?.viewControllers = navigationArray             self.navigationController?.setViewControllers(navigationArray, animated: true)

Naresh Over a year ago

This is my code , ui updated but not working. getting same result.

Sahil Manchanda Over a year ago

You need to remove this line self.navigationController?.viewControllers = navigationArray

Sahil Manchanda Over a year ago

@iOS I've updated my answer with an example, please check

|

Naresh · Accepted Answer · 2019-09-24 10:03:42Z

2

Hide default back button and add custom back button with action:

override func viewDidLoad {
    super.viewDidLoad()
    self.navigationItem.hidesBackButton = true
        let customBackButton = UIBarButtonItem(title: "Back", style: UIBarButtonItem.Style.plain, target: self, action: #selector(back))
        self.navigationItem.leftBarButtonItem = customBackButton
}

Use popToViewController to move back to specific viewcontroller:

@objc func back(sender: UIBarButtonItem) {
    guard let navigationController = self.navigationController else { return }
var navigationArray = navigationController.viewControllers // To get all 
self.navigationController!.popToViewController(navigationArray[navigationArray.count - 2], animated: true)
}

edited Sep 24, 2019 at 10:03

Naresh

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answered Sep 24, 2019 at 9:18

Prakash Shaiva

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5 Comments

Prakash Shaiva Over a year ago

Write this in VC5 when you want to move to VC3

Naresh Over a year ago

When click on navigation bar back button I want to move directly in to VC3. It's default behaviour.. How to write it.

Prakash Shaiva Over a year ago

Add custom back button to navigation bar and write this code in the action of your custom back button

Prakash Shaiva Over a year ago

@iOS Updated my answer with custom back button... check

Naresh Over a year ago

Let us continue this discussion in chat.

Kishan Suthar · Accepted Answer · 2019-09-24 10:09:45Z

0

if you are using custom NavigationBar than you need to use custom back button click Action in VC5 :-

@IBAction func btnBackAction(_ sender: UIButton) {
       let vc = VC3()
       self.navigationController.popToViewController(vc, animated: true)
 }

And if you can use Default NavigationBar than need to remove VC4 in navigation stack in VC5 like this:-

guard let navigationController = self.navigationController else { return }
var navigationArray = navigationController.viewControllers // To get all UIViewController stack as Array
navigationArray.remove(at: navigationArray.count - 2) // To remove previous UIViewController
self.navigationController?.viewControllers = navigationArray

answered Sep 24, 2019 at 10:09

Kishan Suthar

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Comments

maxwell · Accepted Answer · 2019-09-24 12:27:58Z

0

You can use popToViewController(_:animated:) (as Prakash Shaiva answered above):

guard let navigationController = self.navigationController else { return }

var navigationArray = navigationController.viewControllers // To get all 
self.navigationController.popToViewController(navigationArray[navigationArray.count - 2], animated: true)

And try to update your NavigationBar in the method viewWillAppear(_:) for VC3.

edited Sep 24, 2019 at 12:27

answered Sep 24, 2019 at 9:25

maxwell

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