优化

Runtime/UXComponent/Navigation/UXNavigationRuntime.cs

@@ -23,6 +23,9 @@ namespace UnityEngine.UI
         private ulong _activationSerial;
         private bool _missingEventSystemLogged;
 
+        private bool _topScopeDirty = true;
+        private bool _suppressionDirty = true;
+
         [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.AfterSceneLoad)]
         private static void Bootstrap()
         {
@@ -101,6 +104,8 @@ namespace UnityEngine.UI
             }
 
             _scopes.Add(scope);
+            _topScopeDirty = true;
+            _suppressionDirty = true;
         }
 
         internal void UnregisterScope(UXNavigationScope scope)
@@ -117,7 +122,17 @@ namespace UnityEngine.UI
 
             scope.IsAvailable = false;
             scope.SetNavigationSuppressed(false);
-            _scopes.Remove(scope);
+
+            int idx = _scopes.IndexOf(scope);
+            if (idx >= 0)
+            {
+                int last = _scopes.Count - 1;
+                _scopes[idx] = _scopes[last];
+                _scopes.RemoveAt(last);
+            }
+
+            _topScopeDirty = true;
+            _suppressionDirty = true;
         }
 
         internal void MarkDiscoveryDirty()
@@ -138,13 +153,22 @@ namespace UnityEngine.UI
                 DiscoverScopes();
             }
 
+            if (_topScopeDirty)
+            {
                 UXNavigationScope newTopScope = FindTopScope();
+                _topScopeDirty = false;
                 if (!ReferenceEquals(_topScope, newTopScope))
                 {
                     _topScope = newTopScope;
+                    _suppressionDirty = true;
+                }
             }
 
+            if (_suppressionDirty)
+            {
                 ApplyScopeSuppression();
+                _suppressionDirty = false;
+            }
 
             if (UXInputModeService.CurrentMode == UXInputMode.Gamepad)
             {
@@ -237,6 +261,9 @@ namespace UnityEngine.UI
                 {
                     _scopes[i]?.InvalidateSelectableCache();
                 }
+
+                _topScopeDirty = true;
+                _suppressionDirty = true;
             }
         }
 
@@ -275,6 +302,8 @@ namespace UnityEngine.UI
                     {
                         scope.ActivationSerial = ++_activationSerial;
                     }
+
+                    _suppressionDirty = true;
                 }
 
                 if (!available)
@@ -304,11 +333,13 @@ namespace UnityEngine.UI
                 return false;
             }
 
-            return !IsNavigationSkipped(scope.transform)
+            return !scope.IsNavigationSkipped
                    && scope.HasAvailableSelectable()
                    && TryGetInteractiveLayerRoot(scope.transform, out _);
         }
 
+        // 保留静态方法用于 DiscoverScopes 中对 LayerRoot / Holder 节点的检测
+        // 这些节点无 UXNavigationScope，调用频次低（仅在 dirty 时），无需缓存
         private static bool IsNavigationSkipped(Transform current)
         {
             return current != null && current.GetComponentInParent<UXNavigationSkip>(true) != null;

Runtime/UXComponent/Navigation/UXNavigationScope.cs

@@ -33,6 +33,9 @@ namespace UnityEngine.UI
         private bool _navigationSuppressed;
         private int _cachedHierarchyDepth = -1;
 
+        private bool _cachedIsSkipped;
+        private bool _isSkippedCacheValid;
+
         internal ulong ActivationSerial { get; set; }
         internal bool IsAvailable { get; set; }
         internal bool WasAvailable { get; set; }
@@ -47,6 +50,19 @@ namespace UnityEngine.UI
         public bool RequireSelectionWhenGamepad => _requireSelectionWhenGamepad;
         public bool BlockLowerScopes => _blockLowerScopes;
 
+        internal bool IsNavigationSkipped
+        {
+            get
+            {
+                if (!_isSkippedCacheValid)
+                {
+                    _cachedIsSkipped = GetComponentInParent<UXNavigationSkip>(true) != null;
+                    _isSkippedCacheValid = true;
+                }
+                return _cachedIsSkipped;
+            }
+        }
+
         internal Canvas Canvas
         {
             get
@@ -108,6 +124,7 @@ namespace UnityEngine.UI
             _cachedCanvas = null;
             _cachedHolder = null;
             _cachedHierarchyDepth = -1;
+            _isSkippedCacheValid = false;
         }
 
 #if UNITY_EDITOR
@@ -219,12 +236,12 @@ namespace UnityEngine.UI
 
         internal void SetNavigationSuppressed(bool suppressed)
         {
-            RefreshSelectableCache();
             if (_navigationSuppressed == suppressed)
             {
                 return;
             }
 
+            RefreshSelectableCache();
             _navigationSuppressed = suppressed;
             for (int i = 0; i < _cachedSelectables.Count; i++)
             {
@@ -281,11 +298,11 @@ namespace UnityEngine.UI
             }
 
             _removeBuffer.Clear();
-            foreach (var pair in _baselineNavigation)
+            foreach (Selectable key in _baselineNavigation.Keys)
             {
-                if (!_cachedSelectableSet.Contains(pair.Key))
+                if (!_cachedSelectableSet.Contains(key))
                 {
-                    _removeBuffer.Add(pair.Key);
+                    _removeBuffer.Add(key);
                 }
             }