ViewController不调用deinit方法swift 4

问题描述：

我有这个VC在哪里播放视频后台登录。作为出口的两个按钮直接从故事板触发UIStoryboard Push Segue。ViewController不调用deinit方法swift 4

我想要实现的是：一旦我通过segues进入VC中的任何一个视频登录VC deinits，以避免进一步保留周期，一旦我回到这与我的应用程序的正常流程。

在此先感谢。

@IBOutlet weak var loginButton: UIButton! 
@IBOutlet weak var registerButton: UIButton! 
weak var avPlayer: AVPlayer! 
weak var avPlayerLayer: AVPlayerLayer! 

override func viewDidLoad() { 
    super.viewDidLoad() 
    // Do any additional setup after loading the view, typically from a nib. 

    self.loginButton = Util.roundBorderButton(button: self.loginButton, color: UIColor.white.cgColor, radius: 5, width: 1) 
    self.registerButton = Util.roundBorderButton(button: self.registerButton, color: UIColor.white.cgColor, radius: 5, width: 1) 

    if let resourceUrl = Bundle.main.url(forResource: "porsche-trimmed", withExtension: "mp4") { 
     if FileManager.default.fileExists(atPath: resourceUrl.path) { 

      avPlayer = AVPlayer(url: resourceUrl) 
      avPlayerLayer = AVPlayerLayer(player: avPlayer) 
      avPlayerLayer.videoGravity = AVLayerVideoGravity.resizeAspectFill 
      avPlayer.volume = 0 
      avPlayer.actionAtItemEnd = .none 

      avPlayerLayer.frame = view.layer.bounds 
      view.backgroundColor = .clear 
      view.layer.insertSublayer(avPlayerLayer, at: 0) 

      NotificationCenter.default.addObserver(self, 
                selector: #selector(playerItemDidReachEnd(notification:)), 
                name: NSNotification.Name.AVPlayerItemDidPlayToEndTime, 
                object: avPlayer.currentItem) 
     } 
    } 
} 

@objc func playerItemDidReachEnd(notification: Notification) { 
    let p: AVPlayerItem = notification.object as! AVPlayerItem 
    p.seek(to: kCMTimeZero, completionHandler: nil) 
} 

override func viewDidAppear(_ animated: Bool) { 
    super.viewDidAppear(animated) 
    avPlayer.play() 
} 

override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 
    NotificationCenter.default.removeObserver(self) 
} 

deinit { 
    print("deinit video") 
} 

override func didReceiveMemoryWarning() { 
    super.didReceiveMemoryWarning() 
    // Dispose of any resources that can be recreated. 
}

“避免进一步保留周期”阙！？如何调用deinit导致避免保留周期？如果你说“进一步”，它发生在哪里？ –

答

也许通知中心保留您的控制器？尝试评论通知订阅并查看问题是否消失。如果有，请选择一些适当的位置（viewWillDisappear？）取消订阅。

答

案例1：

尝试在override func viewWillDisappear(_ animated: Bool)写NotificationCenter.default.removeObserver(self)线。可能是通知中心保留你viewController的对象。

案例2：如果您使用Segue从您的控制器导航，然后UIStoryboardSegue保留您viewController的对象作为源viewController。在这种情况下，第一种情况也可以解决您的问题。

ViewController不调用deinit方法swift 4

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