添加场景、对应场景代码

unity/Assets/UI/GameManager.cs

@@ -0,0 +1,39 @@
+using System;
+using UnityEngine;
+
+namespace GameFramework
+{
+    /// <summary>
+    /// 全局游戏状态管理器（持久化单例）。
+    /// 维护 GameState，提供 GameOver 触发入口与 onGameOver 事件。
+    /// </summary>
+    public class GameManager : PersistentSingleton<GameManager>
+    {
+        /// <summary>游戏结束时触发（GameOverScreen 等订阅）。</summary>
+        public static Action onGameOver;
+
+        public static GameState GameState
+        {
+            get => Instance.gameState;
+            set => Instance.gameState = value;
+        }
+
+        [SerializeField] private GameState gameState = GameState.Playing;
+
+        /// <summary>触发游戏结束：设状态 + 触发事件。玩家被敌人抓到时调用。</summary>
+        public static void GameOver()
+        {
+            if (Instance == null) return;
+            GameState = GameState.GameOver;
+            onGameOver?.Invoke();
+        }
+    }
+
+    public enum GameState
+    {
+        Playing,
+        Paused,
+        GameOver,
+        Scoring
+    }
+}