public void BuyMaterials() { Transform materialsParent = UIManager.Instance.shopUI.materialsParent; for (int i = 0; i < materialsParent.childCount; i++) { ShopItemUI item = materialsParent.GetChild(i).GetComponent <ShopItemUI>(); int quantity = int.Parse(item.quantityText.text); if (item != null && quantity > 0) { item.Buy(); } } }