Perform Segue From Another Swift File via a class function [closed]

Question

How can I use a class function I implement to perform a segue if the class it is held in is not connected to a viewController?

Answer 1

In order to perform a segue, you need the instance of view controller where the segue originates from - for example:

class MyViewController {
}

class MyClass {
    showNextView(fromViewController: UIViewController) {
        fromViewController.performSegueWithIdentifier("segue_id", sender: fromViewController)
    }
}

However I discourage this kind of interaction. Don't tell the view controller how to show a view - let it do on its own, and just ask it.

So, I suggest creating an instance method in your view controller:

class MyViewController {
    ...
    func goToNextView() {
       performSegueWithIdentifier("segue_id", sender: self)
    }
}

and use that to make the transition:

class MyClass {
    showNextView(fromViewController: MyViewController) {
        fromViewController.goToNextView()
    }
}

Answer 2

You can instruct the currently visible view controller to segue using "performSegueWithIdentifier".

You obviously need a reference to the visible controller.

Inside your method use:

currentViewController.performSegueWithIdentifier("push", sender: currentViewController)