[Unity] 인벤토리 시스템 3

1. Using items

InventoryManager.cs

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

public class InventoryManager : MonoBehaviour
{
    // 최대 중첩 횟수
    public int maxStackedItems = 4;
    public InventorySlot[] inventorySlots;
    public GameObject inventoryItemPrefab;
    // Default selectedSlot 번호
    int selectedSlot = -1;

    private void Start()
    {
        ChangeSelectedSlot(0);
    }

    private void Update()
    {
        if (Input.inputString != null)
        {
            bool isNumber = int.TryParse(Input.inputString, out int number);
            if (isNumber && number > 0 && number < 8)
            {
                ChangeSelectedSlot(number - 1);
            }
        }
    }

    void ChangeSelectedSlot(int newValue)
    {
        // 선택된 인덱스가 0 이상인지 검사
        if (selectedSlot >= 0)
        {
            inventorySlots[selectedSlot].Deselect();
        }

        inventorySlots[newValue].Select();
        selectedSlot = newValue;
    }

    public bool AddItem(Item item)
    {
        // 모든 아이템 슬롯을 대상으로 진행
        for (int i = 0; i < inventorySlots.Length; i++)
        {
            // i 번째 InventorySlot을 가져와서
            InventorySlot slot = inventorySlots[i];
            // 해당 Slot에 있는 InventoryItem을 가져옴
            InventoryItem itemInSlot = slot.GetComponentInChildren<InventoryItem>();

            // 가져온 아이템이 null이 아니고, 같은 아이템이고, 갯수가 4보다 작다면
            // 아이템 갯수 증가
            if (itemInSlot != null &&
                itemInSlot.item == item &&
                itemInSlot.count < maxStackedItems)
            {
                itemInSlot.count++;
                itemInSlot.RefreshCount();
                return true;
            }
        }

        for (int i = 0; i < inventorySlots.Length; i++)
        {
            InventorySlot slot = inventorySlots[i];
            InventoryItem itemInSlot = slot.GetComponentInChildren<InventoryItem>();
            if (itemInSlot == null)
            {
                SpawnNewItem(item, slot);
                return true;
            }
            Debug.Log(itemInSlot);
        }
        return false;
    }

    void SpawnNewItem(Item item, InventorySlot slot)
    {
        GameObject newItemGo = Instantiate(inventoryItemPrefab, slot.transform);
        InventoryItem inventoryItem = newItemGo.GetComponent<InventoryItem>();
        inventoryItem.InitialiseItem(item);
    }

    /*********************************************
    				추 가 된 부 분 
    **********************************************/

    public Item GetSelectedItem(bool use)
    {
        InventorySlot slot = inventorySlots[selectedSlot];
        InventoryItem itemInSlot = slot.GetComponentInChildren<InventoryItem>();
        if (itemInSlot != null)
        {
            Item item = itemInSlot.item;
            if (use == true)
            {
                itemInSlot.count--;
                if (itemInSlot.count <= 0)
                {
                    Destroy(itemInSlot.gameObject);
                }
                else
                {
                    itemInSlot.RefreshCount();
                }
            }
                return item;
        }
        return null;
    }
}

1. TestGroup에 Get selected item 버튼 추가

DemoScript.cs

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

public class DemoScript : MonoBehaviour {
	public InventoryManagerinventoryManager;
    public Item[] itemsToPickup;
    
    public void PickupItem(int id) {
    	bool result = inventoryManager.AddItem(itemsToPickup[id]);
        if(result == true) {
        	Debug.Log("Item added");
		}
        else {
        	Debug.Log("ITEM NOT ADDED");
		}
	}
    
    public void GetSelectedItem(bool use) {
 		Item receivedItem = inventoryManager.GetSelectedItem(false);
        if(receivedItem != null) {
        	Debug.Log("Received item: " + receivedItem);
		} else {
        	Debug.Log("No item received!");
		}
	}
    
    public void UseSelectedItem() {
    	Item receivedItem = inventoryManager.GetSelectedItem(true);
        if (receivedItem != null) {
        	Debug.Log("Used item: " + receivedItem);
		} else {
        	Debug.Log("No item used!");
		}
	}
}