[Unity] GameObjectを生成・再利用するクラス

PoolingContainer.cs

using UnityEngine;
using System.Collections.Generic;

/// <summary>
/// GameObjectを再利用するコンテイナー
/// </summary>
[System.Serializable]
public class PoolingContainer
{
	[SerializeField]
	private GameObject _prefab;

	[SerializeField]
	private Transform _container;
	
	[SerializeField]
	private int _poolingOnAwake;

	private List<GameObject> _list = new List<GameObject>();

	public List<GameObject> list {get{return _list;}}

	/// <summary>
	/// 指定した個数までオブジェクトを生成しておく
	/// </summary>
	public void Prepare()
	{
		while(_list.Count < _poolingOnAwake)
		{
			GenerateObject();
		}
	}

	/// <summary>
	/// 全てのオブジェクトを回収する
	/// </summary>
	public void CollectAllObject()
	{
		foreach (var obj in _list)
		{
			obj.SetActive(false);
		}
	}

	/// <summary>
	/// activeがtrue/falseのオブジェクトを一つ取得する
	/// </summary>
	/// <param name="active"></param>
	/// <returns></returns>
	private GameObject Find(bool active)
	{
		if (_list == null) _list = new List<GameObject>();
		return _list.Find(m => m.gameObject.activeSelf == active);
	}

	/// <summary>
	/// activeがtrue/falseのオブジェクトリストを取得する
	/// </summary>
	/// <param name="active"></param>
	/// <returns></returns>
	private List<GameObject> FindList(bool active)
	{
		if (_list == null) _list = new List<GameObject>();
		return _list.FindAll(m => m.gameObject.activeSelf == active);
	}

	/// <summary>
	/// オブジェクトを取得する
	/// </summary>
	/// <returns></returns>
	public GameObject GetObject()
	{
		var myObject = Find(false);

		if (myObject == null)
		{
			myObject = GenerateObject();
		}
		myObject.SetActive(true);
		return myObject;
	}

	/// <summary>
	/// アクティブなオブジェクトを取得する
	/// </summary>
	/// <returns></returns>
	public List<GameObject> GetActiveObjects()
	{
		return FindList(true);
	}

	/// <summary>
	/// アクティブなオブジェクトを取得する
	/// </summary>
	/// <returns></returns>
	public List<T> GetActiveObjects<T>() where T : Component
	{
		var objects = GetActiveObjects();

		var list = new List<T>();

		foreach (var obj in objects)
		{
			T component = obj.GetComponent<T>();
			if (component != null)
			{
				list.Add(component);
			}
		}

		return list;
	}

	/// <summary>
	/// オブジェクトを取得する
	/// </summary>
	/// <returns></returns>
	public T GetObject<T>() where T : Component
	{
		return GetObject().GetComponent<T>();
	}

	/// <summary>
	/// オブジェクトを生成する
	/// </summary>
	/// <returns></returns>
	private GameObject GenerateObject()
	{
		var myObject = (GameObject)GameObject.Instantiate(_prefab);

		myObject.SetActive(false);
		myObject.transform.parent = _container;
		myObject.name = _prefab.name + "_" + _list.Count;
		myObject.transform.localPosition = Vector3.zero;
		myObject.transform.localScale = _prefab.transform.localScale;
		_list.Add(myObject);

		return myObject;
	}
}