unity对象池（优化）

genice26 · 发表于 2015-1-21 18:06

我们在做项目的时候，如果同一个物体要用到好多次，我们就不要再用实例化了，因为每次创建一个新物体是很消耗资源的，引用对象池技术，顾名思义，把所有要用到的对象在初始化的时候都扔到这个池子里，想用的时候拿出来用，不想用的时候放回去，这样会大大节省资源，我在蛮牛上看到一个写对象池不错的code，拿来分享一下。这个脚本非常简单，但它可以通过大量减少实例化所带来的开销使我的iOS游戏得到很大的性能提升。

把脚本ObjectPool.cs链接到一个GameObject上。
在物体预设数组中设置你想要放到池中并重复利用的预设物体。
在缓冲数组中，指定你希望每个物体在游戏开始时被实例化的数量，这样在开始的时候你就有了池对象。
在你的游戏中调用ObjectPool.instance.GetObjectForType(objectType,onlyPooled)来使用它。objectType写你想生成的预设的名字、并为onlyPooled指定布尔值，如果返回真，它将返回你已经放到池中的对象；如果返回假，它将实例化一个全新的对象。（如果你想限制被池对象的数量，那么设定为真，这样做非常有用，尤其是在需要限制同时播放特效的数量的时候）。
确保你从池中调用的对象知道当它被删除时需要返回到池中。
3. using UnityEngine;
4. using System.Collections;
5. using System.Collections.Generic;
7. public class ObjectPool : MonoBehaviour
8. {
10. public static ObjectPool instance;
12. /// <summary>
13. /// The object prefabs which the pool can handle.
14. /// </summary>
15. public GameObject[] objectPrefabs;
17. /// <summary>
18. /// The pooled objects currently available.
19. /// </summary>
20. public List<GameObject>[] pooledObjects;
22. /// <summary>
23. /// The amount of objects of each type to buffer.
24. /// </summary>
25. public int[] amountToBuffer;
27. public int defaultBufferAmount = 3;
29. /// <summary>
30. /// The container object that we will keep unused pooled objects so we dont clog up the editor with objects.
31. /// </summary>
32. protected GameObject containerObject;
34. void Awake ()
35. {
36. instance = this;
37. }
39. // Use this for initialization
40. void Start ()
41. {
42. containerObject = new GameObject("ObjectPool");
44. //Loop through the object prefabs and make a new list for each one.
45. //We do this because the pool can only support prefabs set to it in the editor,
46. //so we can assume the lists of pooled objects are in the same order as object prefabs in the array
47. pooledObjects = new List<GameObject>[objectPrefabs.Length];
49. int i = 0;
50. foreach ( GameObject objectPrefab in objectPrefabs )
51. {
52. pooledObjects[i] = new List<GameObject>();
54. int bufferAmount;
56. if(i < amountToBuffer.Length) bufferAmount = amountToBuffer[i];
57. else
58. bufferAmount = defaultBufferAmount;
60. for ( int n=0; n<bufferAmount; n++)
61. {
62. GameObject newObj = Instantiate(objectPrefab) as GameObject;
63. newObj.name = objectPrefab.name;
64. PoolObject(newObj);
65. }
67. i++;
68. }
69. }
71. /// <summary>
72. /// Gets a new object for the name type provided. If no object type exists or if onlypooled is true and there is no objects of that type in the pool
73. /// then null will be returned.
74. /// </summary>
75. /// <returns>
76. /// The object for type.
77. /// </returns>
78. /// <param name='objectType'>
79. /// Object type.
80. /// </param>
81. /// <param name='onlyPooled'>
82. /// If true, it will only return an object if there is one currently pooled.
83. /// </param>
84. public GameObject GetObjectForType ( string objectType , bool onlyPooled )
85. {
86. for(int i=0; i<objectPrefabs.Length; i++)
87. {
88. GameObject prefab = objectPrefabs[i];
89. if(prefab.name == objectType)
90. {
92. if(pooledObjects[i].Count > 0)
93. {
94. GameObject pooledObject = pooledObjects[i][0];
95. pooledObjects[i].RemoveAt(0);
96. pooledObject.transform.parent = null;
97. pooledObject.SetActiveRecursively(true);
99. return pooledObject;
101. } else if(!onlyPooled) {
102. return Instantiate(objectPrefabs[i]) as GameObject;
103. }
105. break;
107. }
108. }
110. //If we have gotten here either there was no object of the specified type or non were left in the pool with onlyPooled set to true
111. return null;
112. }
114. /// <summary>
115. /// Pools the object specified. Will not be pooled if there is no prefab of that type.
116. /// </summary>
117. /// <param name='obj'>
118. /// Object to be pooled.
119. /// </param>
120. public void PoolObject ( GameObject obj )
121. {
122. for ( int i=0; i<objectPrefabs.Length; i++)
123. {
124. if(objectPrefabs[i].name == obj.name)
125. {
126. obj.SetActiveRecursively(false);
127. obj.transform.parent = containerObject.transform;
128. pooledObjects[i].Add(obj);
129. return;
130. }
131. }
132. }
134. }
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melliana2024 · 发表于 2017-2-27 15:02

很不错

小宝宝/ht · 发表于 2017-2-27 15:38

楼主是超人

melliana2024 · 发表于 2017-2-27 15:09

好帖就是要顶

小白 · 发表于 2017-2-27 14:49

真心顶

cgjch8 · 发表于 2017-2-27 14:48

LZ真是人才

tt_55 · 发表于 2017-3-10 16:29

很不错

pincers · 发表于 2017-3-10 16:43

好帖就是要顶

淡泊一笑 · 发表于 2017-3-10 16:32

真心顶

liangxinyu · 发表于 2017-3-10 16:22

说的非常好

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[常见问题] unity对象池（优化）