GameObjectを再利用するための仕組み。

UIScrollViewPool

using UnityEngine;
using System.Collections;
using System.Linq;
using System.Collections.Generic;

public class UIScrollViewPool : MonoBehaviour
{
	Stack<HogeItemComponent> stackIcons = new Stack<HogeItemComponent>();

// NGUIの場合はUIWidgetでなければ描画がおかしくなる。UnityUIとかならGameObjectでも良いかも？
	UIWidget poolRoot;

	void Awake()
	{
		// 使用しないオブジェクトの退避先
		var obj = new GameObject ();
		obj.transform.parent = this.transform;
		poolRoot = obj.AddComponent<UIWidget> ();
	}

	public void Push(HogeItemComponent icon)
	{
		if (icon == null) {
			Debug.LogError("HogeItemComponent Push: this icon is null! ");
			return;
		}
		stackIcons.Push (icon);
		icon.transform.parent = poolRoot.transform;
		icon.transform.position = Vector3.zero;
		icon.gameObject.SetActive (false);
	}
	
	public ItemIconComponent Pop(IHogeInfo info, Transform parent)
	{
		if (stackIcons.Count == 0)
			return null;
		IHogeItemComponent icon = stackIcons.Pop ();
		icon.gameObject.SetActive (true);
		icon.gameObject.transform.parent = parent;
		icon.Initialize (info);

		return icon;
	}

}

public interface IHogeItemComponent
{
	Initialize(IHogeInfo info);
}