Client/GameClient/Assets/Game/Launcher/Singleton/SingletonMonoBase.cs

using System.Collections;
using UnityEngine;

namespace GFGGame.Launcher
{
    public class SingletonMonoBase <T> : MonoBehaviour where T : SingletonMonoBase<T>
    {
        private static T _intance;
        public static T Instance
        {
            get
            {
                if (_intance == null)
                {
                    GameObject gObj = GameObject.Find("SingletonObject");
                    if(gObj == null)
                    {
                        gObj = new GameObject("SingletonObject");
                    }
                    _intance = gObj.GetComponent<T>();
                    if(_intance == null)
                    {
                        _intance = gObj.AddComponent<T>();
                    }
                }
                return _intance;
            }
        }

    }
}