 private var playerObserveContext = 0
 
 class MoviePlayerView: UIView {
+    // MARK: enum
+
+    enum ControlUIStatus {
+        case hidden
+        case show
+    }
+
     // MARK: UI
 
     @IBOutlet var contentView: UIView!

        #keyPath(AVPlayer.timeControlStatus),
    ]

    // MARK: Initializer

    override init(frame: CGRect) {

        }

        playerView.player?.play()

        controlUIStatus = .hidden
    }

     @objc private func sliderDidChangeValue(_ slider: UISlider) {
