添加场景、对应场景代码

unity/Assets/UI/Singleton.cs

@@ -0,0 +1,17 @@
+using UnityEngine;
+
+namespace GameFramework
+{
+    /// <summary>
+    /// 场景级单例基类。每个场景里只存在一个实例，切场景后不保留。
+    /// </summary>
+    public class Singleton<T> : MonoBehaviour where T : Component
+    {
+        public static T Instance { get; private set; }
+
+        protected virtual void Awake()
+        {
+            Instance = this as T;
+        }
+    }
+}