Swift popToRoot not working

问题

This highlighted line is where should popToRoot proceed, after a successful registration it should redirect to Root View Controller. For some reason it's not working for me, literally nothing happens, not even error.

I tried with

self.navigationController?.popToRootViewControllerAnimated(true)

回答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.

---

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)

来源：https://stackoverflow.com/questions/29176131/swift-poptoroot-not-working