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

public class PromptWinSingleton<T> : MonoBehaviour where T : PromptWinSingleton<T>
{
    private static T instance = null;
    //静态锁
    private static object _lock = new object();

    public static T Instance
    {
        //获取对象
        get
        {
            //加锁
            lock (_lock)
            {
                if (instance == null)
                {
                    instance = (T)FindObjectOfType(typeof(T));

                    if (FindObjectsOfType(typeof(T)).Length > 1)
                    {
                        Debug.LogError("[Singleton] 发生异常 " +
                            " - 单例类只能有1个" +
                            " 修复错误");
                        return instance;
                    }

                    if (instance == null)
                    {
                        GameObject singleton = new GameObject();
                        instance = singleton.AddComponent<T>();
                        singleton.name = typeof(T).ToString() + "_singleton";

                        DontDestroyOnLoad(singleton);

                        Debug.Log("[Singleton]  " + typeof(T) +
                            " 单例创建成功 " + instance.gameObject.name);
                    }
                    else
                    {
                        //Debug.Log("[Singleton] 已经创建: " +
                        //    instance.gameObject.name);
                    }
                }

                //返回单例字段
                return instance;
            }
        }
    }

    void OnApplicationQuit() { if (instance != null) instance = null; }
}