How to check viewcontroller is added in stack or not

Question

I have two view controllers. I have navigated from one view to another view by press the button to using below code.

 *let secondViewController = self.storyb         


        

Answer 1

All you need is to check with nibName of the viewController and you have your result

this code below will make sure you don't add one viewController again in navigatoinController,

    var VC = YourViewController
    var objVC = (storyboard.instantiateViewController(withIdentifier: "YourViewController"))
    
if navigationController.viewControllers.contains(where: { (VC) -> Bool in
            return objVC.nibName == VC.nibName
        }){
            for (i,controller) in navigationController.viewControllers.enumerated()
            {
                if controller.isKind(of: VC){
                    navigationController.viewControllers.remove(at: i)
                    navigationController.pushViewController(objVC, animated: false)
                }
            }
        }else{navigationController.pushViewController(objVC, animated: false)}

and If you just want to check if the viewController is in NaviagtionController then try this:

var checkForView = navigationController.viewControllers.contains(where: { (VC) -> Bool in
            return objVC.nibName == VC.nibName
        })