Ios 正在获取MPMoviePlayerPlayback完成MPMoviePlayerController的用户密钥nil

我已经在我的应用程序中使用了MPMoviePlayerController。我正在尝试完成MPMoviePlayerController的按钮事件。但我在[MPMoviePlayerPlaybackDidFinishRasonUserInFokey]中得到的值为零，因此应用程序正在崩溃。这是我的代码：

// Define notification in class
let notificationName = Notification.Name("moviePlayerDoneButtonClicked")

//---register and  posted notification in viewDidLoad()    

// Register to receive notification
NotificationCenter.default.addObserver(self, selector: #selector(PlayVideo.moviePlayerDoneButtonClicked), name: self.notificationName, object: nil)

// Post notification
NotificationCenter.default.post(name: self.notificationName, object: nil)

//invoking player
playVideo()


//Event for moviePlayer Done Button Pressed (method for notification) 
func moviePlayerDoneButtonClicked(note: NSNotification) {       
    print ("delegate called....")

    let reason = note.userInfo?[MPMoviePlayerPlaybackDidFinishReasonUserInfoKey]
    if (MPMovieFinishReason(rawValue: reason as! Int) == MPMovieFinishReason.userExited) {

        print ("Done button clicked.")
        self.delegate.exitVideoPlayer()
    }
}

//—code for 
func playVideo() {
    //--Adjust height and width of player as per device
    activityIndicator.isHidden = false
    activityIndicator.startAnimating()

    print ("self.attachmentURL : \(self.attachmentURL)")

    DispatchQueue.main.async {
        let url:URL = URL(string: "https://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4")!
        self.moviePlayer = MPMoviePlayerController(contentURL: url)
        self.moviePlayer!.view.frame = CGRect(x: 0, y: 0, width: self.width, height: self.height);
        self.videoContainerView.addSubview(self.moviePlayer!.view)
        self.moviePlayer!.isFullscreen = false
        self.moviePlayer!.controlStyle = MPMovieControlStyle.embedded

        self.activityIndicator.stopAnimating()
        self.activityIndicator.isHidden = true
    }

}

override func viewDidDisappear(_ animated: Bool) {
    // Stop listening notification
    NotificationCenter.default.removeObserver(self, name: notificationName, object: nil);
}

---

我现在明白你的问题了。您正在发布一个“

moviePlayerDoneButtonClicked

”通知，其中没有对象和

userInfo

字典

你为什么这样做？用户单击“完成”按钮，然后iOS/movie player为您的应用程序创建“完成”通知以进行处理

删除

NotificationCenter.default.post（名称：self.notificationName，…

在那里排队

并将代码更改为：

//Event for moviePlayer Done Button Pressed (method for notification) 
func moviePlayerDoneButtonClicked(notification: NSNotification) {       
    print ("delegate called....")

    if let userInfo = notification.userInfo
    {
        let finishReason = MPMovieFinishReason(rawValue: (notification.userInfo[MPMoviePlayerPlaybackDidFinishReasonUserInfoKey] as! NSNumber).intValue)
        if (finishReason == MPMovieFinishReason.userExited) 
        {
            print ("Done button clicked.")
            self.delegate.exitVideoPlayer()
        }
    } else {
        print("I shouldn't be manually posting a moviePlayerDoneButtonClicked notification without a userInfo dictionary")
    }
}

---

你知道的，还有MPMoviePlayerController，对吗？我的FinishReson为零。应用程序在这条线上崩溃，让FinishReson=MPMovieFinishReson（rawValue:（notification.userInfo！[MPMoviePlayerPlayback diFinishResunserinFokey]as！NSNumber）.intValue）我在那里输入了一个错误-

通知

应该是

注释

。它仍然崩溃吗？是的，我更正了，它仍然崩溃。我为注册和发布通知编写的代码正确吗？我看到了注册和发布通知的行，但它们使用的是哪个功能？（例如

查看加载

）我已经在viewDidLoad中编写了register和post通知代码，然后调用playVideo（）方法。