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Assets/Scripts/Tools/ObjectPooler/IPooledObject.cs

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+public interface IPooledObject{
+    void OnObjectSpawn();
+}

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Assets/Scripts/Tools/ObjectPooler/ObjectPooler.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class ObjectPooler : MonoBehaviour{
+
+    [System.Serializable]
+    public class Pool{
+        public string tag;
+        public GameObject prefab;
+        public int size;
+    }
+
+    public List<Pool> pools;
+    public Dictionary<string, Queue<GameObject>> poolDictionary;
+
+    public static ObjectPooler instance;
+
+    void Awake(){
+        instance = this;
+
+        poolDictionary = new Dictionary<string, Queue<GameObject>>();
+
+        foreach (Pool pool in pools){
+            Queue<GameObject> objectPool = new Queue<GameObject>();
+            for (int i = 0; i < pool.size; i++){
+                GameObject obj = Instantiate(pool.prefab);
+                obj.SetActive(false);
+                obj.transform.parent = transform;
+                objectPool.Enqueue(obj);
+            }
+
+            poolDictionary.Add(pool.tag, objectPool);
+        }
+    }
+
+    /// <summary> Spawns a GameObject taken from a pool to a specific position in world space. </summary>
+    public GameObject SpawnFromPool(string tag, Vector3 position){
+        if (!poolDictionary.ContainsKey(tag)){
+            Debug.LogWarning("Pool with tag " + tag + " doesn't exist.");
+            return null;
+        }
+
+        GameObject objectToSpawn = poolDictionary[tag].Dequeue();
+
+        objectToSpawn.SetActive(true);
+        objectToSpawn.transform.position = position;
+        objectToSpawn.transform.rotation = Quaternion.identity;
+        if (objectToSpawn.transform.parent != transform){
+            objectToSpawn.transform.SetParent(transform);
+        }
+
+        IPooledObject pooledObj = objectToSpawn.GetComponent<IPooledObject>();
+        if (pooledObj != null){
+            pooledObj.OnObjectSpawn();
+        }
+
+        poolDictionary[tag].Enqueue(objectToSpawn);
+
+        return objectToSpawn;
+    }
+
+    /// <summary> Spawns a GameObject taken from a pool to a specific position and rotation in world space. </summary>
+    public GameObject SpawnFromPool(string tag, Vector3 position, Quaternion rotation){
+        if (!poolDictionary.ContainsKey(tag)){
+            Debug.LogWarning("Pool with tag " + tag + " doesn't exist.");
+            return null;
+        }
+
+        GameObject objectToSpawn = poolDictionary[tag].Dequeue();
+
+        objectToSpawn.SetActive(true);
+        objectToSpawn.transform.position = position;
+        objectToSpawn.transform.rotation = rotation;
+        if (objectToSpawn.transform.parent != transform){
+            objectToSpawn.transform.SetParent(transform);
+        }
+
+        IPooledObject pooledObj = objectToSpawn.GetComponent<IPooledObject>();
+        if (pooledObj != null){
+            pooledObj.OnObjectSpawn();
+        }
+
+        poolDictionary[tag].Enqueue(objectToSpawn);
+
+        return objectToSpawn;
+    }
+
+    /// <summary> Spawns a GameObject taken from a pool to a specific position and rotation in world space and sets it as a child of a transform. </summary>
+    public GameObject SpawnFromPool(string tag, Vector3 position, Quaternion rotation, Transform parent){
+        if (!poolDictionary.ContainsKey(tag)){
+            Debug.LogWarning("Pool with tag " + tag + " doesn't exist.");
+            return null;
+        }
+
+        GameObject objectToSpawn = poolDictionary[tag].Dequeue();
+
+        objectToSpawn.SetActive(true);
+        objectToSpawn.transform.position = position;
+        objectToSpawn.transform.rotation = rotation;
+        if (parent != null){
+            objectToSpawn.transform.SetParent(parent);
+        }
+
+        IPooledObject pooledObj = objectToSpawn.GetComponent<IPooledObject>();
+        if (pooledObj != null){
+            pooledObj.OnObjectSpawn();
+        }
+
+        poolDictionary[tag].Enqueue(objectToSpawn);
+
+        return objectToSpawn;
+    }
+
+    /// <summary> Spawns a GameObject taken from a pool to a specific position and rotation in world or local space and sets it as a child of a transform. </summary>
+    public GameObject SpawnFromPool(string tag, Vector3 position, Quaternion rotation, Transform parent, bool instantiateInWorldSpace){
+        if (!poolDictionary.ContainsKey(tag)){
+            Debug.LogWarning("Pool with tag " + tag + " doesn't exist.");
+            return null;
+        }
+
+        GameObject objectToSpawn = poolDictionary[tag].Dequeue();
+
+        if (instantiateInWorldSpace){
+            objectToSpawn.SetActive(true);
+            objectToSpawn.transform.position = position;
+            objectToSpawn.transform.rotation = rotation;
+            if (parent != null){
+                objectToSpawn.transform.SetParent(parent);
+            }
+        }else if(parent != null){
+            objectToSpawn.SetActive(true);
+            objectToSpawn.transform.SetParent(parent);
+            objectToSpawn.transform.localPosition = position;
+            objectToSpawn.transform.localRotation = rotation;
+        }else{
+            objectToSpawn.SetActive(true);
+            objectToSpawn.transform.position = position;
+            objectToSpawn.transform.rotation = rotation;
+            if (parent != null){
+                objectToSpawn.transform.SetParent(parent);
+            }
+        }
+
+        IPooledObject pooledObj = objectToSpawn.GetComponent<IPooledObject>();
+        if (pooledObj != null){
+            pooledObj.OnObjectSpawn();
+        }
+
+        poolDictionary[tag].Enqueue(objectToSpawn);
+
+        return objectToSpawn;
+    }
+}

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