ViewController 没有调用 deinit 方法 swift 4

Question

我有这个 VC 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。

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

提前致谢。

@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.
}

Answer 1

也许通知中心保留了您的控制器？尝试注释掉通知订阅并查看问题是否消失。如果是，请选择一些合适的地方（viewWillDisappear？）取消订阅。

Answer 2

案例 1：

尝试在 override func viewWillDisappear(_ animated: Bool) 中写入 NotificationCenter.default.removeObserver(self) 行。可能是通知中心保留了你viewController的对象。

案例二：如果您使用 Segue 从您的控制器导航，那么 UIStoryboardSegue 保留您 viewController 的对象作为源 viewController。那么第一种情况也可以解决你的问题。

ViewController 没有调用 deinit 方法 swift 4

ViewController not calling deinit method swift 4

iphone

swift

swift4

ios11