Setting Inventory Reference to a Object For Pickup when the Inventory is a Instantiated Prefab

Questions & Answers
1

So, I’m having an issue in my game where the objects I need to pick up require a reference to the Inventory. However, the Inventory attached to an Inventory GameObject that is a child of a Canvas that is instantiated when the game starts. Is possible to get the reference the object to be picked up needs?

Pictures:
194201-access.png

Code 1:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PickUpObject : MonoBehaviour {

    [SerializeField] Pickup item;
    [SerializeField] Inventory inventory;
    [SerializeField] AccessInventory access;
    private bool hasEntered;

    void Update() {
        if (Input.GetKeyDown(KeyCode.F) && hasEntered) {
            inventory.AddItem(item);
            access.accessInventory();
            Destroy(this.gameObject);
        }
    }
    void OnTriggerEnter(Collider other) {
        if (other.CompareTag("Player")) {
            hasEntered = true;
        }
    }
}

Code 2:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Inventory : MonoBehaviour {

    public static Inventory instance;
    [SerializeField] List<Pickup> items;
    [SerializeField] Transform itemsParent;
    [SerializeField] InventorySlots[] inventorySlots;

    private void Awake() {
        if (instance == null) {
            instance = this;
        }
        else {
            Destroy(this.gameObject);
        }
    }

    private void OnValidate() {
        if (itemsParent)
        {
            inventorySlots = itemsParent.GetComponentsInChildren<InventorySlots>();
        }
        GetUIUpdate();
    }

    public bool AddItem(Pickup item) {
        if (isFull()) {
            return false;
        }
        items.Add(item);
        GetUIUpdate();
        return true;
    }

    public bool RemoveItem(Pickup item) {
        if (items.Remove(item)){
            GetUIUpdate();
            return true;
        }
        return false;
    }

    public bool isFull() {
        return items.Count >= inventorySlots.Length;
    }

    void GetUIUpdate() {
        int i = 0;
        for (; i < items.Count && i < inventorySlots.Length; i++) {
            inventorySlots_.item = items*;*_

}
for (; i < inventorySlots.Length; i++) {
inventorySlots*.item = null;*
}
}

public void SaveInventory() {
GlobalController.instance.inventory = inventorySlots;
}
}

2

Since you have a static reference to the Inventory object, you can just feed it to the PickupObject on Start or OnEnable, e.g.:

void OnEnable()
{
    inventory = Inventory.instance;
}

By the way, you don’t even have to do that if you have a static reference, since you can just access it directly when you want with Inventory.instance.WhateverPublicMemberHere;

In general, though, even if you didn’t have a static reference, you could have searched for the object either by name, or Unity - Scripting API: Object.FindObjectOfType.
For example, on the PickupObject you would write (instead of the code above):

void OnEnable()
{
    inventory = FindObjectOfType<Inventory>(); // find by type
    inventory = GameObject.Find("Name_Of_Inventory_Object_Here"); // by name

}

Note that looking for the object instead of already having a reference to it is obviously more expensive in terms of performance.