Inventory.updateSlotAmount C# (CSharp) Method

    public void updateSlotAmount()
    {
        if (prefabSlot == null)
            prefabSlot = Resources.Load("Prefabs/Slot - Inventory") as GameObject;

        if (SlotContainer == null)
        {
            SlotContainer = (GameObject)Instantiate(prefabSlotContainer);
            SlotContainer.transform.SetParent(PanelRectTransform.transform);
            SlotContainerRectTransform = SlotContainer.GetComponent<RectTransform>();
            SlotGridRectTransform = SlotContainer.GetComponent<RectTransform>();
            SlotGridLayout = SlotContainer.GetComponent<GridLayoutGroup>();
        }

        if (SlotContainerRectTransform == null)
            SlotContainerRectTransform = SlotContainer.GetComponent<RectTransform>();
        SlotContainerRectTransform.localPosition = Vector3.zero;

        List<Item> itemsToMove = new List<Item>();
        List<GameObject> slotList = new List<GameObject>();
        foreach (Transform child in SlotContainer.transform)
        {
            if (child.tag == "Slot") { slotList.Add(child.gameObject); }
        }

        while (slotList.Count > width * height)
        {
            GameObject go = slotList[slotList.Count - 1];
            ItemOnObject itemInSlot = go.GetComponentInChildren<ItemOnObject>();
            if (itemInSlot != null)
            {
                itemsToMove.Add(itemInSlot.item);
                ItemsInInventory.Remove(itemInSlot.item);
            }
            slotList.Remove(go);
            DestroyImmediate(go);
        }

        if (slotList.Count < width * height)
        {
            for (int i = slotList.Count; i < (width * height); i++)
            {
                GameObject Slot = (GameObject)Instantiate(prefabSlot);
                Slot.name = (slotList.Count + 1).ToString();
                Slot.transform.SetParent(SlotContainer.transform);
                slotList.Add(Slot);
            }
        }

        if (itemsToMove != null && ItemsInInventory.Count < width * height)
        {
            foreach (Item i in itemsToMove)
            {
                addItemToInventory(i.itemID);
            }
        }

        setImportantVariables();
    }

    void changeInventorySize(int size)
    {
        dropTheRestItems(size);

        if (mainInventory == null)
        {
            mainInventory = inventory.GetComponent <Inventory>();
        }
        if (size == 3)
        {
            mainInventory.width  = 3;
            mainInventory.height = 1;
            mainInventory.updateSlotAmount();
            mainInventory.adjustInventorySize();
        }
        if (size == 6)
        {
            mainInventory.width  = 3;
            mainInventory.height = 2;
            mainInventory.updateSlotAmount();
            mainInventory.adjustInventorySize();
        }
        else if (size == 12)
        {
            mainInventory.width  = 4;
            mainInventory.height = 3;
            mainInventory.updateSlotAmount();
            mainInventory.adjustInventorySize();
        }
        else if (size == 16)
        {
            mainInventory.width  = 4;
            mainInventory.height = 4;
            mainInventory.updateSlotAmount();
            mainInventory.adjustInventorySize();
        }
        else if (size == 24)
        {
            mainInventory.width  = 6;
            mainInventory.height = 4;
            mainInventory.updateSlotAmount();
            mainInventory.adjustInventorySize();
        }
    }