fixed bugs

ios/OralTrainer/Player/PlayerSurfaceView.swift

@@ -13,15 +13,20 @@ struct PlayerSurfaceView: UIViewRepresentable {
 
     func makeUIView(context: Context) -> VideoSurfaceView {
         let view = VideoSurfaceView()
-        view.playerLayer.player = controller.player
         view.controller = controller
         view.onVerticalSwipe = onVerticalSwipe
+        view.attach(player: controller.player)
+        view.setContentHuggingPriority(.defaultLow, for: .vertical)
+        view.setContentHuggingPriority(.defaultLow, for: .horizontal)
+        view.setContentCompressionResistancePriority(.defaultLow, for: .vertical)
+        view.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
         return view
     }
 
     func updateUIView(_ uiView: VideoSurfaceView, context: Context) {
-        uiView.playerLayer.player = controller.player
+        uiView.controller = controller
         uiView.onVerticalSwipe = onVerticalSwipe
+        uiView.attach(player: controller.player)
     }
 }
 
@@ -29,13 +34,9 @@ final class VideoSurfaceView: UIView {
     weak var controller: PlayerController?
     var onVerticalSwipe: ((Bool) -> Void)?
 
-    override class var layerClass: AnyClass {
-        AVPlayerLayer.self
-    }
+    private let videoLayer = AVPlayerLayer()
 
-    var playerLayer: AVPlayerLayer {
-        layer as! AVPlayerLayer
-    }
+    var playerLayer: AVPlayerLayer { videoLayer }
 
     private let minSwipeDistance: CGFloat = 48
     private let minSwipeVelocity: CGFloat = 160
@@ -55,7 +56,11 @@ final class VideoSurfaceView: UIView {
     override init(frame: CGRect) {
         super.init(frame: frame)
         backgroundColor = .black
-        playerLayer.videoGravity = .resizeAspect
+        isOpaque = true
+        clipsToBounds = true
+        videoLayer.videoGravity = .resizeAspect
+        videoLayer.backgroundColor = UIColor.black.cgColor
+        layer.addSublayer(videoLayer)
 
         tapRecognizer = UITapGestureRecognizer(target: self, action: #selector(handleTap))
         panRecognizer = UIPanGestureRecognizer(target: self, action: #selector(handlePan))
@@ -82,6 +87,25 @@ final class VideoSurfaceView: UIView {
         fatalError("init(coder:) has not been implemented")
     }
 
+    override func layoutSubviews() {
+        super.layoutSubviews()
+        CATransaction.begin()
+        CATransaction.setDisableActions(true)
+        videoLayer.frame = bounds
+        CATransaction.commit()
+    }
+
+    func attach(player: AVPlayer) {
+        if videoLayer.player !== player {
+            videoLayer.player = player
+        }
+        if videoLayer.superlayer !== layer {
+            layer.addSublayer(videoLayer)
+        }
+        videoLayer.frame = bounds
+        videoLayer.isHidden = false
+    }
+
     @objc private func handleTap() {
         controller?.handleGesture(.singleTap)
     }
@@ -96,7 +120,6 @@ final class VideoSurfaceView: UIView {
         case .began:
             resetSwipeTracking()
         case .changed:
-            // 在滑动达到阈值时立即派发，并且同一个手势只允许派发一次。
             evaluateSwipe(dx: dx, dy: dy, velocity: velocity)
         case .ended, .cancelled, .failed:
             if !didDispatchSwipe {
@@ -112,7 +135,6 @@ final class VideoSurfaceView: UIView {
         guard !didDispatchSwipe else { return }
 
         if swipeAxis == nil {
-            // 只有方向足够明确时锁定轴向，避免轻微斜滑被误判为上下滑。
             if abs(dx) > abs(dy) * 1.2 {
                 swipeAxis = .horizontal
             } else if abs(dy) > abs(dx) * 1.2 {