添加场景、对应场景代码

unity/Assets/UI/PersistentSingleton.cs

@@ -0,0 +1,27 @@
+using UnityEngine;
+
+namespace GameFramework
+{
+    /// <summary>
+    /// 持久化单例基类。跨场景保留（DontDestroyOnLoad），重复实例自动销毁。
+    /// 管理器（AudioManager / ScoreManager / GameManager / SceneLoader）都继承它。
+    /// </summary>
+    public class PersistentSingleton<T> : MonoBehaviour where T : Component
+    {
+        public static T Instance { get; private set; }
+
+        protected virtual void Awake()
+        {
+            if (Instance == null)
+            {
+                Instance = this as T;
+            }
+            else if (Instance != this)
+            {
+                Destroy(gameObject);
+                return;
+            }
+            DontDestroyOnLoad(gameObject);
+        }
+    }
+}