using UnityEngine;

public class MBSingletonManager<T> : MonoBehaviour where T : MonoBehaviour
{
    /// <summary>
    /// 存储唯一实例的私有静态变量
    /// </summary>
    private static T instance;

    /// <summary>
    /// 用于锁定的对象
    /// </summary>
    private static readonly object mlock = new object(); 

    /// <summary>
    /// 公共静态属性用于访问实例
    /// </summary>
    public static T Instance
    {
        get
        {
            // 使用锁确保线程安全
            lock (mlock)
            {
                if (instance == null)//如果实例为空,则寻找现有的实例
                {
                    instance = FindObjectOfType<T>();

                    if (instance == null)//如果场景中没有找到实例,则创建一个新的
                    {
                        GameObject singletonObject = new GameObject(typeof(T).Name);
                        instance = singletonObject.AddComponent<T>();
                    }
                    DontDestroyOnLoad(instance); //保持单例在场景切换时不被销毁
                }
                return instance;
            }
        }
    }

    /// <summary>
    /// 释放单例
    /// </summary>
    public virtual void ReleaseInstance()
    {
        if (instance != null)
        {
            Destroy(instance.gameObject);
            instance = null; // 释放引用
        }
    }
}