HK_LongZhiMeng/Assets/Scripts/Common/Singleton.cs

using System;
using UnityEngine;

public class Singleton<T> : BaseBehaviour
    where T : BaseBehaviour
{

    private static bool m_ShuttingDown = false;
    private static object m_Lock = new object();
    private static T m_Instance;

    // 单例对象在切换场景时不销毁
    public virtual void Awake()
    {
        DontDestroyOnLoad(gameObject);
    }
    /// <summary>
    /// 单例
    /// </summary>
    public static T Instance
    {
        get
        {
            if (m_ShuttingDown)
            {
                Debug.LogWarning($"[{typeof(T)}]已经销毁");
                return null;
            }

            lock (m_Lock)
            {
                if (m_Instance == null)
                {
                    // 找到单例对象
                    m_Instance = (T)FindObjectOfType(typeof(T));

                    // 对象为空创建新对象
                    if (m_Instance == null)
                    {
                        // 创建一个空对象
                        var singletonObject = new GameObject();
                        m_Instance = singletonObject.AddComponent<T>();
                        singletonObject.name = $"[{typeof(T).ToString()}]";

                        // Make instance persistent.
                        //DontDestroyOnLoad(singletonObject);
                    }
                }

                return m_Instance;
            }
        }
    }

    public virtual void Initialize() { }

    private void OnApplicationQuit()
    {
        m_ShuttingDown = true;
    }


    private void OnDestroy()
    {
        m_ShuttingDown = true;
    }
}