CODEWITHSUNDEEP
iosswiftuinavigationcontroller
Kex
Kex

Reputation: 8629

How to insert a new view controller in the navigation stack and then pop to it?

I want to insert a new view controller just before the view controller that is currently presented on the stack. I have tried something like this:

let vc: ECAssessmentVC = ECAssessmentVC.createViewController()
vc.mode = .assessmentResults
vc.quizzes = quizzes
if var vcs: [UIViewController] = navigationController?.viewControllers {
    vcs.insert(vc, at: vcs.count - 1)
    navigationController?.popViewController(animated: true )
}

However when I pop the new view controller is not showing. How would I achieve this?

Upvotes: 0

Views: 1825

Answers (2)

Shehata Gamal
Shehata Gamal

Reputation: 100541

You have to re assign the array

if var vcs: [UIViewController] = navigationController?.viewControllers {
     vcs.insert(vc, at: vcs.count - 1)
     navigationController?.viewControllers = vcs
    navigationController?.popViewController(animated: true )
}

Upvotes: 1

matt
matt

Reputation: 535988

You are saying this:

if var vcs: [UIViewController] = navigationController?.viewControllers {
    vcs.insert(vc, at: vcs.count - 1)

But that code, alone, is pointless. You have inserted a view controller into vcs, yes; but navigationController.viewControllers is unaffected. And then vcs is thrown away; it is useless.

You need to add this line:

    navigationController?.viewControllers = vcs

Upvotes: 3

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