ViewController不調用deinit方法swift 4

我有這個VC在哪裏播放視頻後臺登錄。作爲出口的兩個按鈕直接從故事板觸發UIStoryboard Push Segue。ViewController不調用deinit方法swift 4

我想要實現的是：一旦我通過segues進入VC中的任何一個視頻登錄VC deinits，以避免進一步保留週期，一旦我回到這與我的應用程序的正常流程。

在此先感謝。

@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. 
}

來源

2017-10-13 Mario Arámbula

「避免進一步保留週期」闕！？如何調用deinit導致避免保留週期？如果你說「進一步」，它發生在哪裏？ –