添加对象池并更新KeySettingManager的README

Pool/SingletonObjectPooler.cs

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+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.Pool;
+
+namespace AnnoyingUtils.Pool
+{
+    public class SingletonObjectPool<T> : MonoBehaviour where T : MonoBehaviour
+    {
+        #region 单例
+
+        private static SingletonObjectPool<T> _instance;
+
+        public static SingletonObjectPool<T> Instance
+        {
+            get
+            {
+                if (_instance) return _instance;
+                _instance = FindObjectOfType<SingletonObjectPool<T>>();
+                if (_instance) return _instance;
+                var obj = new GameObject(typeof(SingletonObjectPool<T>).Name);
+                _instance = obj.AddComponent<SingletonObjectPool<T>>();
+                return _instance;
+            }
+        }
+
+        #endregion
+
+
+        private ObjectPool<T> _pool;
+        private T _prefab;
+        private Queue<T> _activeObjects;
+        private int _maxActiveObjects;
+
+        public void Init(T prefab, int defaultCapacity = 1, int maxSize = 10)
+        {
+            if (prefab is null)
+            {
+                Debug.LogError("预制体为空");
+                return;
+            }
+
+            _prefab = prefab;
+            _maxActiveObjects = maxSize;
+            _pool = new ObjectPool<T>(CreateFunc, ActionOnGet, ActionOnRelease, ActionOnDestroy, true, defaultCapacity,
+                maxSize);
+            _activeObjects = new Queue<T>();
+        }
+
+        private T CreateFunc()
+        {
+            return Instantiate(_prefab);
+        }
+
+        private void ActionOnGet(T obj)
+        {
+            obj.gameObject.SetActive(true);
+            _activeObjects.Enqueue(obj);
+        }
+
+        private void ActionOnRelease(T obj)
+        {
+            obj.gameObject.SetActive(false);
+        }
+
+        private void ActionOnDestroy(T obj)
+        {
+            Destroy(obj.gameObject);
+        }
+
+        //供滴人死亡、子弹命中等调用
+        public void Release(T obj)
+        {
+            if (_pool is null)
+            {
+                Debug.LogWarning(typeof(T).Name + " 对象池未实例化");
+                return;
+            }
+
+            _activeObjects.Dequeue();
+            _pool.Release(obj);
+        }
+
+        public T Spawn(Transform parent)
+        {
+            if (_pool is null)
+            {
+                Debug.LogWarning(typeof(T).Name + " 对象池未实例化");
+                return null;
+            }
+
+            //检查是否超出容量
+            if (_activeObjects.Count >= _maxActiveObjects)
+            {
+                var oldestObject = _activeObjects.Peek();
+                Release(oldestObject);
+            }
+
+            var temp = _pool.Get();
+            temp.transform.position = parent.position;
+            return temp;
+        }
+    }
+}