[Solved] Make inventory that receives purchased items from the shop system

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You can use events to make your scripts “communicate” independently.

First you need the gameevents. Make sure you have the script on a gameobject in your scene:

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

public class GameEvents : MonoBehaviour
{
    public static GameEvents gameEvents;

    private void Awake()
    {
        gameEvents = this;
    }

    public event Action<Item> onItemPurchase;

    public void ItemPurchaseMade(Item item)
    {
        if(onItemPurchase != null)
        {
            onItemPurchase(item);
        }
    }
}

Then include the trigger in your buy method:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

public class ShopManager : MonoBehaviour
{

    public int[,] shopItems = new int[9, 9];
    public float coins;
    public Text CoinsTXT;


    void Start()
    {
        CoinsTXT.text = "" + coins.ToString();

        //ID's
        shopItems[1, 1] = 1;
        shopItems[1, 2] = 2;
        shopItems[1, 3] = 3;
        shopItems[1, 4] = 4;
        shopItems[1, 5] = 5;
        shopItems[1, 6] = 6;
        shopItems[1, 7] = 7;
        shopItems[1, 8] = 8;

        //Price
        shopItems[2, 1] = 10;
        shopItems[2, 2] = 20;
        shopItems[2, 3] = 30;
        shopItems[2, 4] = 40;
        shopItems[2, 5] = 50;
        shopItems[2, 6] = 65;
        shopItems[2, 7] = 110;
        shopItems[2, 8] = 150;

    }


    public void Buy()
    {
        GameObject ButtonRef = GameObject.FindGameObjectWithTag("Event").GetComponent<EventSystem>().currentSelectedGameObject;

        if (coins >= shopItems[2, ButtonRef.GetComponent<ButtonInfo>().ItemID])
        {
            coins -= shopItems[2, ButtonRef.GetComponent<ButtonInfo>().ItemID];
            CoinsTXT.text = "Coins:" + coins.ToString();

            Item yourItem = Item() //get your Item from ID

            GameEvents.gameEvents.ItemPurchaseMade(yourItem);
        }


    }
}

Then listen to the event from your inventory class:

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

public class Inventory {

    private List<Item> itemList;

    public Inventory()
    {

        GameEvents.gameEvents.onItemPurchase += AddItem;

        itemList = new List<Item>();

        Debug.Log("Inventory");
    }

    public void AddItem(Item item)
    {
        itemList.Add(item);
    }
}

It is unclear where you get the item by their ids from. That is why I left that part out. As an alternative, you could pass the itemId though the events and get the item in the inventory class.

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solved Make inventory that receives purchased items from the shop system