Script for spawning list items on UI in Unity.

GUIList.cs

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


public class GUIList<T> : MonoBehaviour where T : MonoBehaviour
{
    [Header("GUI List configuration")]
    [SerializeField] T _itemPrefab;
    [Header("GUI List debug")]
    [SerializeField] List<T> _listItems;
    [SerializeField] Transform _parentTransform;

    public void ClearTransform()
    {
        foreach (Transform child in _parentTransform.transform)
        {
            Destroy(child.gameObject);
        }
        _listItems.Clear();
    }

    public List<T> AdaptChild(int amount)
    {
        int currentItems = _listItems.Count;
        if (currentItems < amount)
        {
            int difference = amount - currentItems;
            for (int i = 0; i < difference; i++)
            {
                SpawnNewItem();
            }
        }else
        {
            ClearTransform();
            AdaptChild(amount);
        }
        return _listItems;
        
    }

    private void SpawnNewItem()
    {
        T newItemPrefab = Instantiate(_itemPrefab, _parentTransform);
        _listItems.Add(newItemPrefab);
    }

    public List<T> RefreshCompletely(int amount)
    {
        ClearTransform();
        return AdaptChild(amount);
    }


}