CODEWITHSUNDEEP
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Bawenang Rukmoko Pardian Putra
Bawenang Rukmoko Pardian Putra

Reputation: 1411

How to do 'prepareSegue' for back button?

I've got a pretty simple question. In my app, there are some screens that have a navigation bar, and some that don't have it. So, what I did was to flag this manually between screen in prepareForSegue: using this line self.navigationController?.setNavigationBarHidden(true/false, animated: false) . Now, how do I do it if I want to go back from a view controller with a navigation bar to a view controller that doesn't have it by clicking on the back button? I tried putting it in the prepareForSegue: of the child view controller but it doesn't work.

Thanks.

Upvotes: 0

Views: 75

Answers (2)

Midhun
Midhun

Reputation: 2177

you can also use a better approach with unwind segue

override func didMoveToParentViewController(parent: UIViewController?) {
    if (parent == nil) {
        println("Back Button Pressed!")
    }
}

Upvotes: 0

Deepika
Deepika

Reputation: 468

It depends how you are maintaining your flags for hiding/unhiding the navigation Bar but you can use UINavigationControllerDelegate for the same

 @available(iOS 2.0, *)
    optional public func navigationController(_ navigationController: UINavigationController, willShow viewController: UIViewController, animated: Bool)

    @available(iOS 2.0, *)
    optional public func navigationController(_ navigationController: UINavigationController, didShow viewController: UIViewController, animated: Bool)

Alternatively, you can try to put setNavigationBarHidden in viewWillAppear and viewWillDisappear for each viewController.

Upvotes: 1

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