废话不多说，记录自己常用的单例模式代码

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Sirenix.OdinInspector;

/// <summary>
/// monoebhaviour的 全局 单例模板 线程安全 可以创建自己
/// </summary>
public class GlobalSingleton<T> : MonoBehaviour, IInstance where T : MonoBehaviour, IInstance
{
    private static readonly object _lock = new object();

    private static bool IsQuit = false;

    private static bool IsInit = false;

    private static T _instance;
    public static T Instance
    {
        get
        {
            if (IsQuit) return null;

            lock (_lock)
            {

                if (_instance == null)
                {
                    _instance = (T)FindObjectOfType(typeof(T));

                    if (_instance == null)
                    {
                        GameObject singleton = new GameObject();
                        _instance = singleton.AddComponent<T>();

                        singleton.name = "(GSingleton) " + typeof(T).ToString();
                        singleton.transform.position = Vector3.zero;
                        singleton.transform.rotation = Quaternion.identity;
                        singleton.transform.localScale = Vector3.one;
                    }

                    DontDestroyOnLoad(_instance.gameObject);
                }
                if (!IsInit)
                {
                    _instance.Init();
                    IsInit = true;
                }

                return _instance;
            }
        }
    }

    public virtual void Init() { }

    private void OnDestroy()
    {
        IsQuit = true;
    }
}
public interface IInstance
{
    void Init();
}