Swift - How to remove a viewcontroller from NavigationController?

Question

I've got 4 ViewControllers attached to a NavigationController. The order of them is 1->2->3->4. When the user presses the back button on 4, I'd like them to be redirected to 2 instead of 3. At the same time, I'd also like the user to be directed back to 2 when the back button is pressed on 3. Is this possible? Thanks in advance.

Use unwind segue, there are many similar answers. Here is [one](http://stackoverflow.com/q/24029586/5099208) — Idan, Nov 30 '16 at 05:56
If you want swift answer then have a look at this one http://stackoverflow.com/questions/31878108/ios-swift-poptoviewcontroller-by-name — Nirav D, Nov 30 '16 at 05:59
use unwined segue http://stackoverflow.com/questions/12561735/what-are-unwind-segues-for-and-how-do-you-use-them — Cruz, Nov 30 '16 at 08:24

score 1 · Accepted Answer · answered Nov 30 '16 at 05:59

1

Of course you can do this. Simply create the left bar button on 4th ViewController. and on that button action pop to 2nd viewcontroller

      if let viewcontroller = self.navigationController?.viewControllers[1] where viewcontroller.isKindOfClass(YourController) {
       self.navigationController?.popToViewController(viewcontroller, animated: false)          }

answered Nov 30 '16 at 05:59

Sahil

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Small changes in Swift3: if let viewcontroller = self.navigationController?.viewControllers[1], viewcontroller is YourViewController { let _ = self.navigationController?.popToViewController(viewcontroller, animated: false) } – Thomas G. Nov 30 '16 at 06:24
Thank you! It worked. Another question because I'm an absolute beginner: How do I assign this to a back button? I looked through the list of UIBarButtonSystemItems but there doesn't seem to be a back button available. – qunayu Nov 30 '16 at 23:35
on 4th viewcontroller viewDidload self.navigationItem.leftBarButtonItem = UIBarButtonItem(image: image, style:.Plain, target: self, action:#selector(self.back(_:))) and action func backButtonAction(sender: AnyObject) { if let viewcontroller = self.navigationController?.viewControllers[1] where viewcontroller.isKindOfClass(YourController) { self.navigationController?.popToViewController(viewcontroller, animated: false) } } – Sahil Dec 01 '16 at 05:28

score 0 · Answer 2 · answered Nov 30 '16 at 07:14

if let vc = self.viewControllerWithClass(YourVC.self) {

                    self.popToViewController(vc, animated: true)
}


extension UINavigationController {

    func viewControllerWithClass(_ aClass: AnyClass) -> UIViewController? {

        for vc in self.viewControllers {

            if vc.isMember(of: aClass) {

                return vc
            }
        }

        return nil
    }
}

score 0 · Answer 3 · answered Nov 30 '16 at 09:34

You can check for the controller in navigation stack.

let controllers = navigationController!.viewControllers.reverse()
    for controller in controllers
    {
        if controller.isKindOfClass(YourController)
        {
            self.navigationController?.popToViewController(controller, animated: true)
            return
        }
    }

Swift - How to remove a viewcontroller from NavigationController?

3 Answers3