Swift popToRoot not working

Question

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Answer 1

You don't appear to be using navigation controller at all, so I'd wager that self.navigationController is nil.

You could use an unwind segue. So in your root view controller, add a method like so:

@IBAction func unwindToRoot(segue: UIStoryboardSegue) {
    print("successfully unwound")
}

Then in your scoreboard scene from which you want to unwind, you can control-drag from the button to the "exit outlet":

When you let go, you can pick the unwind action:

This achieves the "pop to root" sort of functionality, but is not contingent upon using navigation controller.

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If you want to perform this unwind programmatically, rather than doing the segue from the button to the exit outlet, do it from the view controller icon to the exit outlet:

Then, select the segue in the document outline and give this segue a unique storyboard id:

Then you can programmatically perform the segue, using the same identifier string:

performSegueWithIdentifier("UnwindToRoot", sender: self)