Update

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

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+using UnityEngine;
+
+namespace Invector.vItemManager
+{
+    [vClassHeader("Contains Item Trigger", "Simple trigger to check if the Player has a specific Item, you can also use Events to trigger something if you have the item.", openClose = false)]
+    public class vContainsItemTrigger : vMonoBehaviour
+    {
+        public bool getItemByName;
+        [vHideInInspector("getItemByName")]
+        public string itemName;
+        [vHideInInspector("getItemByName", true)]
+        public int itemID;
+        public bool useTriggerStay;
+        public int desiredAmount = 1;
+        [Header("OnTriggerEnter/Stay")]
+        public UnityEngine.Events.UnityEvent onContains;
+        public UnityEngine.Events.UnityEvent onNotContains;
+        [Header("OnTriggerExit")]
+        public UnityEngine.Events.UnityEvent onExit;
+
+        public vItemManager itemManager;
+        public void OnTriggerEnter(Collider other)
+        {
+            if (other.gameObject.CompareTag("Player"))
+            {
+                var itemManager = other.GetComponent<vItemManager>();
+                if (itemManager)
+                {
+                    CheckItem(itemManager);
+                }
+            }
+        }        
+
+        public void OnTriggerStay(Collider other)
+        {
+            if (!useTriggerStay) return;
+            if (other.gameObject.CompareTag("Player"))
+            {
+                itemManager = other.GetComponent<vItemManager>();
+                if (itemManager)
+                {
+                    CheckItem(itemManager);
+                }
+            }
+        }
+
+        public void OnTriggerExit(Collider other)
+        {
+            if (other.gameObject.CompareTag("Player"))
+            {
+                onExit.Invoke();
+            }
+        }
+
+        /// <summary>
+        /// Remove desired item of the target <seealso cref="vItemManager"/>
+        /// </summary>
+        public void RemoveDesiredItem()
+        {
+            if (itemManager)
+            {
+                if (getItemByName)
+                {
+                    if (ContainsItem(itemManager))
+                    {
+                        itemManager.DestroyItem(itemManager.GetItem(itemName), desiredAmount > 1 ? desiredAmount : 1);
+                    }
+                }
+                else
+                {
+                    if (ContainsItem(itemManager))
+                    {
+                        itemManager.DestroyItem(itemManager.GetItem(itemID), desiredAmount > 1 ? desiredAmount : 1);
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        ///  Check if the <seealso cref="vItemManager"/> has the target item and call events <seealso cref="onContains"/> or <seealso cref="onNotContains"/>
+        /// </summary>
+        /// <param name="itemManager"></param>
+        protected virtual void CheckItem(vItemManager itemManager)
+        {
+            if (itemManager == null) return;
+            if (ContainsItem(itemManager))
+            {
+                onContains.Invoke();
+            }
+            else
+                onNotContains.Invoke();
+        }
+
+        /// <summary>
+        /// Check if a item exists in the <seealso cref="itemManager"/>
+        /// </summary>
+        /// <param name="itemManager"></param>
+        /// <returns>Contains or not</returns>
+        protected bool ContainsItem(vItemManager itemManager)
+        {
+            return desiredAmount > 1 ? (getItemByName ? itemManager.ContainItem(itemName, desiredAmount) : itemManager.ContainItem(itemID, desiredAmount)) :
+                   (getItemByName ? itemManager.ContainItem(itemName) : itemManager.ContainItem(itemID));
+        }
+    }
+
+}