CODEWITHSUNDEEP
iosswiftxcodecocoa-touchuinavigationcontroller
Naresh
Naresh

Reputation: 17942

I have issue to remove ViewController from Navigation stack?

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

Upvotes: 2

Views: 1658

Answers (4)

maxwell
maxwell

Reputation: 4166

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.

Upvotes: 0

Kishan Suthar
Kishan Suthar

Reputation: 658

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

Upvotes: 0

Prakash Shaiva
Prakash Shaiva

Reputation: 1095

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)
}

Upvotes: 2

Sahil Manchanda
Sahil Manchanda

Reputation: 10577

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

Upvotes: 3

Related Questions