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

Here we go.

This line will give you a array of UIViewControllers

self.navigationController?.viewControllers

Now what you have to do is check your viewControllerObject does exist or not?

By writing this line

if viewController.isKindOfClass(YourController){
}

and here is a complete code.

if let viewControllers = self.navigationController?.viewControllers {
            for viewController in viewControllers {

                if viewController.isKindOfClass(YourController) {
                    print("Your controller exist")
                }
       } 
}

When you write below line while going back to your 'ViewControllerA' it will remove a ViewControllerB from navigation stack.

self.navigationController?.popViewControllerAnimated(true)

It is just similar pop operation which we are doing with stack and navigationcontroller is a stack.

Let me know if you have any confusions.