Update

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

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+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.Events;
+
+namespace Invector.vItemManager
+{
+    [vClassHeader("Check Item in Inventory", openClose = false)]
+    public class vCheckItemInInventory : vMonoBehaviour
+    {
+        protected vItemManager itemManager;
+        public bool getInParent = true;
+        public List<CheckItemIDEvent> itemIDEvents;
+
+        void Awake()
+        {
+            if (!itemManager)
+            {
+                if (getInParent)
+                    itemManager = GetComponentInParent<vItemManager>();
+                else
+                    itemManager = GetComponent<vItemManager>();
+
+                if (itemManager)
+                {
+                    itemManager.onAddItemID.AddListener(CheckItemExists);
+                    itemManager.onRemoveItemID.AddListener(CheckItemExists);
+                }
+            }
+        }
+
+        public void CheckOnTrigger(Collider collider)
+        {
+            if (collider != null)
+            {
+                itemManager = collider.gameObject.GetComponent<vItemManager>();
+
+                if (itemManager)
+                {
+                    for (int i = 0; i < itemIDEvents.Count; i++)
+                    {
+                        CheckItemIDEvent check = itemIDEvents[i];
+                        CheckItemID(check);
+                    }
+                }
+            }
+        }
+
+        private void CheckItemExists(int arg1)
+        {
+            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<int> _itemsID;
+            public UnityEvent onContainItem, onNotContainItem;
+
+            public bool Check(vItemManager itemManager)
+            {
+                bool _ContainItem = true;
+
+                for (int i = 0; i < _itemsID.Count; i++)
+                {
+                    if (!itemManager.ContainItem(_itemsID[i]))
+                    {
+                        _ContainItem = false;
+                        break;
+                    }
+                }
+                return _ContainItem;
+            }
+        }
+    }
+}