Update

Assets/Invector-3rdPersonController/ItemManager/Scripts/Examples/vCheckItemsInInventory.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.Events;
+
+namespace Invector.vItemManager
+{
+    [vClassHeader("Check Items in Inventory", openClose = false)]
+    public class vCheckItemsInInventory : vMonoBehaviour
+    {
+        public vItemManager itemManager;
+        public List<CheckItemIDEvent> itemIDEvents;
+
+        IEnumerator Start()
+        {
+            yield return new WaitForEndOfFrame();
+
+            if (itemManager)
+            {
+                itemManager.inventory.OnUpdateInventory += (CheckItemExists);
+            }
+        }
+
+        private void OnValidate()
+        {
+            if (!itemManager)
+            {
+                itemManager = GetComponent<vItemManager>();
+
+                if (!itemManager)
+                {
+                    itemManager = GetComponentInParent<vItemManager>();
+                }
+            }
+        }
+
+        public void CheckItemExists()
+        {
+            for (int i = 0; i < itemIDEvents.Count; i++)
+            {
+                CheckItemIDEvent check = itemIDEvents[i];
+                CheckItemID(check);
+            }
+        }
+
+        private void CheckItemID(CheckItemIDEvent check)
+        {
+            if (check.Check(itemManager))
+            {
+                check.onContainItem.Invoke();
+            }
+            else
+            {
+                check.onNotContainItem.Invoke();
+            }
+        }
+
+        [System.Serializable]
+        public class CheckItemIDEvent
+        {
+            public string name;
+            public List<ItemID> itemIds;
+            public UnityEvent onContainItem, onNotContainItem;
+
+            public bool Check(vItemManager itemManager)
+            {
+                bool _ContainItem = true;
+
+                for (int i = 0; i < itemIds.Count; i++)
+                {
+                    ItemID itemID = itemIds[i];
+                    if (itemID.verifyAmmount && itemManager.GetAllAmount(itemID.id) < itemID.ammount)
+                    {
+                        _ContainItem = false;
+                        break;
+                    }
+                    else if (!itemID.verifyAmmount && !itemManager.ContainItem(itemID.id))
+                    {
+                        _ContainItem = false;
+                        break;
+                    }
+                }
+                return _ContainItem;
+            }
+        }
+
+        [System.Serializable]
+        public class ItemID
+        {
+            public int id;
+            public bool verifyAmmount;
+            public int ammount;
+        }
+    }
+}