ProjectDDD/Assets/Scirpts/ItemBuild/Inventory.cs

using System.Collections.Generic;
using UnityEngine;

namespace DDD
{
    public class Inventory : MonoBehaviour
    {
        public RectTransform inventoryRoot;
        public ItemUI itemPrefab;

        private Dictionary<string, Item> inventory;
        private Stack<ItemUI> unusedItemUIs;
        private Transform unusedRoot;

        private ItemUI selectedItem;

        private async void Start()
        {
            var task = GoogleSheetManager.LoadSo<ItemSo>();
            var items = await task;

            itemPrefab.transform.SetParent(null);
            itemPrefab.gameObject.SetActive(false);

            unusedItemUIs = new Stack<ItemUI>();
            var obj = new GameObject("UnusedRoot");
            obj.SetActive(false);
            unusedRoot = obj.transform;

            // TODO: 데이터에서 가져오기
            inventory = new Dictionary<string, Item>();
            inventory["0"] = items.ItemList[0];
            inventory["1"] = items.ItemList[1];
            inventory["2"] = items.ItemList[2];
            UpdateItemList();
        }

        public void UpdateItemList()
        {
            var counts = inventoryRoot.childCount;
            for (int i = 0; i < counts; ++i)
            {
                var child = inventoryRoot.GetChild(0);
                unusedItemUIs.Push(child.GetComponent<ItemUI>());
                child.SetParent(unusedRoot);
            }

            foreach (var item in inventory)
            {
                var usingPool = unusedItemUIs.TryPop(out var itemObject);

                if (usingPool == false)
                {
                    itemObject = Instantiate(itemPrefab.gameObject).GetComponent<ItemUI>();
                }

                itemObject.gameObject.SetActive(true);
                itemObject.transform.SetParent(inventoryRoot);
                itemObject.SetUpItem(item.Value);
            }
        }
    }
}