CustomPrefabPool.cs

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

public class CustomPrefabPool<T> where T : Component
{
    public class PrefabForComponentFactory : IFactory<T>
    {
        private readonly T _prefab;
        private readonly IInstantiator _container;

        public PrefabForComponentFactory(T prefab, IInstantiator container)
        {
            _container = container;
            _prefab = prefab;
        }

        public T Create()
        {
            return _container.InstantiatePrefabForComponent<T>(_prefab);
        }
    }

    private readonly IInstantiator _container;
    private MonoMemoryPool<T> _pool;

    [Inject]
    public CustomPrefabPool(IInstantiator container)
    {
        _container = container;
    }

    public T Spawn(T prefab)
    {
        if (_pool == null)
        {
            _pool = _container.Instantiate<MonoMemoryPool<T>>(new object[]
            {
                new MemoryPoolSettings()
                {
                    InitialSize = 1,
                    ExpandMethod = PoolExpandMethods.OneAtATime,
                    MaxSize = int.MaxValue
                },
                new PrefabForComponentFactory(prefab, _container)
            });
        }

        return _pool.Spawn();
    }

    public void Despawn(T go)
    {
        _pool.Despawn(go);
    }
}