尝试将导航控制器显示为rootViewController时，视图不在View Hierachy中

Question

@IBAction func logOut(sender: AnyObject) {
    PFUser.logOutInBackground()


    let MainView: UIViewController = self.presentingViewController!

    self.dismissViewControllerAnimated(true, completion: {let storyboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
    let vc: UIViewController = storyboard.instantiateViewControllerWithIdentifier("ViewController") as UIViewController

    let navigationController = UINavigationController(rootViewController: vc)

        MainView.presentViewController(navigationController, animated: true, completion: nil)})
}

I connect a ViewController using the Push segue and inside that ViewController i have button that log the user out, It does not push me all the way to the rootViewController instantly but get stuck in the "login" ViewController then pushes up the ViewController from the bottom then showing the error: Warning: Attempt to present on whose view is not in the window hierarchy!

Answer 1

From what I understand, you are trying to come back to the root view controller on logout?

You could just do. self.navigationController?.popToRootViewControllerAnimated(true)

Answer 2

let vc: UIViewController = storyboard!.instantiateViewControllerWithIdentifier("ViewController") as UIViewController

    let navigationController = UINavigationController(rootViewController: vc)

    self.presentViewController(navigationController, animated: false, completion: nil)

This does not create any error and connects the closest NavigationController to the ViewController.