using UnityEngine;



public class SingletonMonobehaviour<T> : MonoBehaviour where T : MonoBehaviour
{

    private static volatile T s_Instance = null;
    private static object s_Root = new object();

    public static T Instance
    {
        get
        {
            if (s_Instance == null)
            {
                lock (s_Root)
                {
                    T[] _instances = (T[])FindObjectsOfType(typeof(T));
                    string _name = typeof(T).Name;
                    if (_instances != null)
                    {
                        for (var i = 0; i < _instances.Length; i++)
                        {
                            Destroy(_instances[i].gameObject);
                            //Debug.Log("销毁了: " + _name);
                        }
                    }
                    //Debug.Log("创建了: " + _name);
                    GameObject _go = new GameObject();
                    _go.name = _name;
                    s_Instance = _go.AddComponent<T>();
                    DontDestroyOnLoad(_go);
                }
            }
            return s_Instance;
        }
    }

    public static bool IsValid()
    {
        return s_Instance != null;
    }

    protected virtual void OnDestroy()
    {
        // Debug.Log("执行了销毁");
        s_Instance = null;
    }
}