ios - 尝试将导航 Controller 呈现为 rootViewController 时， View 不在 View 层次结构中

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)})
}

我使用Push segue连接一个ViewController，并且在该ViewController内部有一个可以让用户退出的按钮，它不会插入我立即一路到达 rootViewController，但卡在“登录”ViewController 中，然后从底部向上推 ViewController 然后显示错误:警告:尝试其 View 不在窗口层次结构中!

Answer 1

据我了解，您试图在注销时返回到 Root View Controller ？

你可以这么做。 self.navigationController?.popToRootViewControllerAnimated(true)