fixed some bugs

ios/OralTrainer/Player/PlayerSurfaceView.swift

@@ -44,6 +44,13 @@ final class VideoSurfaceView: UIView {
     private var tapRecognizer: UITapGestureRecognizer!
     private var panRecognizer: UIPanGestureRecognizer!
     private var longPressRecognizer: UILongPressGestureRecognizer!
+    private var didDispatchSwipe = false
+    private var swipeAxis: SwipeAxis?
+
+    private enum SwipeAxis {
+        case horizontal
+        case vertical
+    }
 
     override init(frame: CGRect) {
         super.init(frame: frame)
@@ -80,25 +87,65 @@ final class VideoSurfaceView: UIView {
     }
 
     @objc private func handlePan(_ recognizer: UIPanGestureRecognizer) {
-        guard recognizer.state == .ended || recognizer.state == .cancelled else {
-            return
-        }
         let translation = recognizer.translation(in: self)
         let velocity = recognizer.velocity(in: self)
         let dx = translation.x
         let dy = translation.y
-        if abs(dy) > abs(dx),
-           abs(dy) >= minSwipeDistance,
-           abs(velocity.y) >= minSwipeVelocity {
+
+        switch recognizer.state {
+        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 {
+                evaluateSwipe(dx: dx, dy: dy, velocity: velocity)
+            }
+            resetSwipeTracking()
+        default:
+            break
+        }
+    }
+
+    private func evaluateSwipe(dx: CGFloat, dy: CGFloat, velocity: CGPoint) {
+        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 {
+                swipeAxis = .vertical
+            } else {
+                return
+            }
+        }
+
+        switch swipeAxis {
+        case .vertical:
+            guard abs(dy) >= minSwipeDistance,
+                  abs(velocity.y) >= minSwipeVelocity else {
+                return
+            }
+            didDispatchSwipe = true
             onVerticalSwipe?(dy < 0)
-            return
+        case .horizontal:
+            guard abs(dx) >= abs(dy),
+                  abs(dx) >= minSwipeDistance,
+                  abs(velocity.x) >= minSwipeVelocity else {
+                return
+            }
+            didDispatchSwipe = true
+            controller?.handleGesture(dx > 0 ? .swipeRight : .swipeLeft)
+        default:
+            break
         }
-        guard abs(dx) >= abs(dy),
-              abs(dx) >= minSwipeDistance,
-              abs(velocity.x) >= minSwipeVelocity else {
-            return
-        }
-        controller?.handleGesture(dx > 0 ? .swipeRight : .swipeLeft)
+    }
+
+    private func resetSwipeTracking() {
+        didDispatchSwipe = false
+        swipeAxis = nil
     }
 
     @objc private func handleLongPress(_ recognizer: UILongPressGestureRecognizer) {