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U3D应用缓存管理物体

1. 在Unity中比较常见的功能发射子弹，一般得我们都去动态生成物体 (子弹prefab).

动态生成物体优点：1.可以灵活的控制场景 2. 可以马上看到效果.
缺点：这样不断的生成，销毁，性能开销大.

2. 所以一般我们使用Cache 缓存来完成. 上代码.

3. 首先创建一个脚本，巢穴吧.

public class DbSpawn : MonoBehaviour {  public static DbSpawn Instance;  public ObjectCache[] Caches;  private Hashtable _cacheObjects;  [System.Serializable]  public class ObjectCache  {   public GameObject Prefab;   public int CacheLens = 10;   private GameObject[] _objects;   private int cacheIndex = 0;   /// <summary>   /// 初始化   /// </summary>   public void Init()   {    _objects = new GameObject[CacheLens];    for (int i = 0; i < CacheLens; i++)    {     _objects[i] = Instantiate(Prefab) as GameObject;     _objects[i].gameObject.SetActive(false);     _objects[i].name = _objects[i].name + i;    }   }   /// <summary>   /// 获取没有被激活的   /// </summary>   /// <returns></returns>   public GameObject GetNextObjectCache()   {    GameObject obj = null;    for (int i = 0; i < CacheLens; i++)    {     obj = _objects[cacheIndex];     if (!obj.activeSelf)     {      break;     }     cacheIndex = (cacheIndex + 1) % CacheLens;    }    if (obj != null && obj.activeSelf)    {     DbSpawn.Destroy(obj);    }    cacheIndex = (cacheIndex + 1) % CacheLens;    return obj;   }  }  void Awake()  {   Instance = this;   var total = 0;   foreach (ObjectCache t in Caches)   {    t.Init();    total += t.CacheLens;   }   _cacheObjects = new Hashtable(total);  }  /// <summary>  /// 孵化一个prefab实例  /// </summary>  /// <param name="prefab"></param>  /// <param name="position"></param>  /// <param name="rotation"></param>  /// <returns></returns>  public static GameObject SpawnObject(GameObject prefab, Vector3 position, Quaternion rotation)  {   ObjectCache cache = null;   if (Instance)   {    //获取符合当前prefab缓存    foreach (ObjectCache t in Instance.Caches)    {     if (t.Prefab == prefab)     {      cache = t;      break;     }    }   }   if (cache == null)   {    return Instantiate(prefab, position, rotation) as GameObject;   }   //获取当前缓存容器 可用实例   GameObject obj = cache.GetNextObjectCache();   //设置实例属性    obj.transform.position = position;   obj.transform.rotation = rotation;   obj.SetActive(true);   //存入哈希表   Instance._cacheObjects[obj] = true;   return obj;  }  //销毁处理  public static void Destroy(GameObject obj)  {   if (Instance && Instance._cacheObjects.ContainsKey(obj))   {    obj.SetActive(false);    Instance._cacheObjects[obj] = false;   }   else   {    Destroy(obj);   }  }

4. 在子弹prefab创建一个脚本

public class DbBullet : MonoBehaviour {  /// <summary>  /// 速度  /// </summary>  public float Speed = 10f;  /// <summary>  /// 子弹生命时间  /// </summary>  public float Life = 0.5f;  /// <summary>  /// 距离  /// </summary>  public float Dist = 1000;  private float _spawnTime = 0f;  private Transform _tr;  void OnEnable()  {   _tr = transform;   _spawnTime = Time.deltaTime;  }  // Update is called once per frame  void Update()  {   _tr.position += transform.forward * Speed * Time.deltaTime;   Dist -= Speed * Time.deltaTime;   if (Time.deltaTime > _spawnTime + Life || Dist < 0)   {    DbSpawn.Destroy(gameObject);    Dist = 10;   }  }

5. 模拟发射了.

public class DbShooter : MonoBehaviour {  public Transform point;  public GameObject prefab;  public float TimeCount = 10f;  private float _timer = 0f;  private bool _isShooter = false;  // Update is called once per frame  void Update()  {   if (Input.GetMouseButtonDown(0))   {    _isShooter = true;   }   if (Input.GetMouseButtonUp(0))   {    _isShooter = false;   }   if (_isShooter)   {    _timer += Time.deltaTime;    if (_timer > 1 / TimeCount)    {     DbSpawn.SpawnObject(prefab, point.position, Quaternion.identity);     _timer = 0f;    }   }  } }