ios - 警告 : Attempt to present ZMNavigationController on **. ViewController 其 View 不在窗口层次结构中

Question

伙计们，我在 NavigationController 方面遇到了一个奇怪的问题。现有的答案根本没有帮助!!!!

这是应用程序的基本场景:

1. There are two views - Main and Second view
2. In main view there is a button when i happen to tap goes into second view using segue.
3. In second view after i enter a certain field in text view and click on a button called "join" it triggers "joinMeeting()" function and meeting should be joined.

但是，当我这样做时，调试器会向我显示:

"Warning: Attempt to present on <***.ViewController: *****> whose view is not in the window hierarchy!"

所以我已经阅读了大部分内容，并且考虑到它是由于 viewDidAppear 方法而发生的，但在 viewDidAppear 之前我还需要完成 nth 操作。单击按钮后一切都会发生。

joinMeeting() is successfully called and print method returns 0 which means no issue(https://developer.zoom.us/docs/ios/error-codes/) and successful SDK connection however after this "Warning" error is shown in debugger and nothing happens in the app.

如果有帮助的话，下面是触发 joinBtn 的代码:

/**
Triggers when Join Button is clicked from second view.
*/
    @IBAction func joinMeeting(_ sender: Any) {
            if( activityID.text == "" ) {
                let alert = UIAlertController(title: "Field is Blank", message: "Activity ID cannot be blank.", preferredStyle: UIAlertControllerStyle.alert)
                alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil))
                self.present(alert, animated: true, completion: nil)

                return;
            }


            let ms: MobileRTCMeetingService? = MobileRTC.shared().getMeetingService()
            if ms != nil {
                ms?.delegate = self;

                // //For Join a meeting
                let paramDict: [AnyHashable: Any] = [
                    kMeetingParam_Username: kSDKUserName,
                    kMeetingParam_MeetingNumber: activityID.text!,
                ]

                let ret: MobileRTCMeetError? = ms?.joinMeeting(with: paramDict)
                print("onJoinaMeeting ret:\(String(describing: ret))")
            }
        }

如果有人知道或知道我在这里缺少什么，请提供帮助。

Answer 1

以下是解决问题的方法:

Storyboard配置: ViewController --Segue: Show--> JoinViewController

@IBAction func onClickJoin(_ sender: AnyObject) {
        //Main storyBoard
        let initialVC = UIStoryboard(name: "Main", bundle:nil).instantiateInitialViewController() as! UIViewController

        let appDelegate = (UIApplication.shared.delegate as! AppDelegate)

        appDelegate.window?.rootViewController = initialVC

        //Rest of the code
    }