1

Assets/MyGame/aa/UI/Home/Sub/UIHome_BY_ItemListPanels.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
@@ -464,6 +465,7 @@ public class UIHome_BY_ItemListPanels : SubUIBase
 
     private void ClearItemList()
     {
+        ReleasePreviewAcquired(); // ⭐ 切列表/关面板：释放当前预览的按需资源
         foreach (var toggle in _instantiatedToggles)
         {
             if (toggle != null)
@@ -659,6 +661,7 @@ public class UIHome_BY_ItemListPanels : SubUIBase
 
     private void ClearZhanShenItemList()
     {
+        ReleasePreviewAcquired(); // ⭐ 切列表/关面板：释放当前预览的按需资源
         foreach (var toggle in _instantiatedZSItemToggles)
         {
             if (toggle != null)
@@ -725,12 +728,8 @@ public class UIHome_BY_ItemListPanels : SubUIBase
         if (rawImg_DetailPreview != null)
             rawImg_DetailPreview.gameObject.SetActive(true);
 
-        // ---- 预览（和翅膀一样实例化预制体到预览区）----
-        if (resData != null && previewParent != null && prefab != null)
-        {
-            _currentPreviewObj = Instantiate(prefab, previewParent);
-            _currentPreviewObj.SetActive(true);
-        }
+        // ---- 预览（⭐按需加载：点哪个战神加载哪个，切走自动释放上一个）----
+        ShowPreviewOnDemand(turretNumber, true);
     }
 
     // ==================== 战神选择按钮 ====================
@@ -994,14 +993,12 @@ public class UIHome_BY_ItemListPanels : SubUIBase
             rawImg_DetailPreview.gameObject.SetActive(_currentSelectType != ItemPanelSelect.Turrect);
 
         // ---- 预览 ----
-        if (resData != null && previewParent != null && prefab != null)
+        // ---- 预览（⭐按需加载：点哪个加载哪个，切走自动释放上一个）----
+        ShowPreviewOnDemand(turretNumber, false, obj =>
         {
-            _currentPreviewObj = Instantiate(prefab, previewParent);
-            _currentPreviewObj.SetActive(true);
-
-            if (_currentSelectType == ItemPanelSelect.Turrect)
+            if (obj != null && _currentSelectType == ItemPanelSelect.Turrect)
             {
-                var rt = _currentPreviewObj.GetComponent<RectTransform>();
+                var rt = obj.GetComponent<RectTransform>();
                 if (rt != null)
                 {
                     rt.anchorMin = new Vector2(0.5f, 0f);
@@ -1010,7 +1007,7 @@ public class UIHome_BY_ItemListPanels : SubUIBase
                     rt.localScale = Vector3.one * 2.5f;
                 }
             }
-        }
+        });
     }
 
     /// <summary>清除预览区当前展示的实例。</summary>
@@ -1023,6 +1020,71 @@ public class UIHome_BY_ItemListPanels : SubUIBase
         }
     }
 
+    // ==================== 预览按需加载（点哪个加载哪个，切走释放上一个） ====================
+
+    private int _previewSeq = 0;
+    /// <summary>当前预览已 Acquire 的编号（切走时释放）</summary>
+    private int _previewAcquiredId = 0;
+    private bool _previewAcquiredIsZS = false;
+
+    /// <summary>
+    /// ⭐ 按需加载并显示预览模型：释放上一个的按需引用 → 异步获取当前 → 实例化。
+    /// 战神走 ZS{编号}+Display 标签，炮台/翅膀走 PT{编号} 标签。
+    /// 快速连续点击由 seq 竞态丢弃（只显示最后点的那一个）。
+    /// onLoaded：实例化后的回调（炮台预览的 RectTransform 特殊处理等）。
+    /// </summary>
+    private void ShowPreviewOnDemand(int turretNumber, bool isZhanShen, System.Action<GameObject> onLoaded = null)
+    {
+        StartCoroutine(ShowPreviewRoutine(turretNumber, isZhanShen, onLoaded, ++_previewSeq));
+    }
+
+    private IEnumerator ShowPreviewRoutine(int turretNumber, bool isZhanShen, System.Action<GameObject> onLoaded, int seq)
+    {
+        // 释放上一个预览的按需引用（归零卸包 → 内存里同时只有一个预览资源）
+        ReleasePreviewAcquired();
+
+        if (turretNumber <= 0 || previewParent == null)
+        {
+            ClearPreview();
+            onLoaded?.Invoke(null);
+            yield break;
+        }
+
+        var task = isZhanShen
+            ? TurretResourcesData.AcquireZhanShenAsync(turretNumber, ZhanShenUsage.Display)
+            : TurretResourcesData.AcquireTurretPrefabAsync(turretNumber);
+        while (!task.IsCompleted)
+            yield return null;
+
+        // 期间又点了别的 → 丢弃本次并归还引用
+        if (seq != _previewSeq)
+        {
+            if (isZhanShen) TurretResourcesData.ReleaseZhanShen(turretNumber, ZhanShenUsage.Display);
+            else TurretResourcesData.ReleaseTurretPrefab(turretNumber);
+            yield break;
+        }
+
+        GameObject prefab = task.Result;
+        ClearPreview();
+        if (prefab != null)
+        {
+            _previewAcquiredId = turretNumber;
+            _previewAcquiredIsZS = isZhanShen;
+            _currentPreviewObj = Instantiate(prefab, previewParent);
+            _currentPreviewObj.SetActive(true);
+        }
+        onLoaded?.Invoke(_currentPreviewObj);
+    }
+
+    /// <summary>释放当前预览的按需引用（面板关闭/切列表时调用，归零卸包）</summary>
+    private void ReleasePreviewAcquired()
+    {
+        if (_previewAcquiredId <= 0) return;
+        if (_previewAcquiredIsZS) TurretResourcesData.ReleaseZhanShen(_previewAcquiredId, ZhanShenUsage.Display);
+        else TurretResourcesData.ReleaseTurretPrefab(_previewAcquiredId);
+        _previewAcquiredId = 0;
+    }
+
     /// <summary>根据道具数据生成特殊效果描述。</summary>
     private static string GetSpecialEffectText(TurretResourcesData resData, TurretData turretData, BaseUserProp userProp = null)
     {