"Presenting view controllers on detached view controllers is discouraged" 呈现模态时的消息

Question

我有一个导航控制器和根视图。然后在该根视图中，我在那里推送了一个视图，我必须单击才能观看内容，如果已登录，如果未登录，它将使用以下代码打开一个模态视图控制器。

        var vc = self.storyboard?.instantiateViewControllerWithIdentifier("LoginViewController") as! LoginViewController
        self.tabBarController!.presentViewController(vc, animated: true, completion: nil)

在 viewdidload() 中我有一个 nsnotification 以便当用户从登录模式重新登录时我可以得到通知

 NSNotificationCenter.defaultCenter().addObserver(self, selector: ("didDismissSecondViewController:"), name: "SecondViewControllerDismissed", object: nil)

完成所有工作后，我在登录控制器中编写了以下代码

 self.dismissViewControllerAnimated(true, completion: {NSNotificationCenter.defaultCenter().postNotificationName("SecondViewControllerDismissed", object: nil, userInfo: nil)});

所以在我的第一个视图控制器中我写了下面的代码

func didDismissSecondViewController(sender: AnyObject)
{
    NSLog("Called ns notifications")
    dispatch_async(dispatch_get_main_queue(),{

        let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        if Reachability.isConnectedToNetwork() == true {
let storyboard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let vc : VideoPlayViewController = storyboard.instantiateViewControllerWithIdentifier("video") as! VideoPlayViewController
        vc.movieUrl = self.movieURL
        NSLog("URL:- \(self.movieURL)")
        let navigationController = UINavigationController(rootViewController: vc)

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

        }
        else
        {

         var alert = UIAlertView(title: "No Internet connection", message: "Please ensure you are connected to the Internet. Connect to internet and and choose any sorting option to reload.", delegate: self,  cancelButtonTitle: "Cancel")
                alert.addButtonWithTitle("Ok")
                alert.show()


        }


    })

}

然而，当它试图在关闭登录控制器后显示视图控制器时，它显示 "Presenting view controllers on detached view controllers is discouraged" 错误并且崩溃了。

Answer 1

感谢上帝，我找到了答案！！！

var viewCon:UIViewController = self.presentingViewController!

self.dismissViewControllerAnimated(true, completion: {let storyboard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)

let vc : VideoPlayViewController = storyboard.instantiateViewControllerWithIdentifier("video") as! VideoPlayViewController

vc.movieUrl = self.movieUrl

let navigationController = UINavigationController(rootViewController: vc)

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

"Presenting view controllers on detached view controllers is discouraged" 呈现模态时的消息

"Presenting view controllers on detached view controllers is discouraged" message when presenting modal

model-view-controller

uiviewcontroller

ios

uistoryboard

swift