Unity 泛型单例

using UnityEngine;

/// <summary>
/// 
/// * Writer：June
/// 
/// * Data：2021.12.20
/// 
/// * Function：普通泛型单例
/// 
/// * Remarks：
/// 
/// </summary>
public abstract class Singleton<T> where T : new()
{
	private static T instance;
    private static object mutex = new object();
	public static T Instance
    {
        get
        {
            if (instance == null)
            {
                //确保单例线程安全
                lock (mutex)
                {
                    if (instance == null) instance = new T();
                }
            }
            return instance;
        }
    }
}


/// <summary>
/// 
/// * Function：Unity泛型单例
/// 
/// * Remarks：
/// 
/// </summary>
public class MonoSingleton<T> : MonoBehaviour where T : MonoSingleton<T>
{
	private static T instance;
    /// <summary>
    /// 是否初始化完成
    /// </summary>
    public static bool IsInitialize { get; private set; }

    public static T Instance 
	{
		get
        {
            //判断是否为空
            if (!instance)
            {
                instance = FindObjectOfType(typeof(T)) as T;
                if (!instance)
                {
                    instance = new GameObject("_" + typeof(T).Name).AddComponent<T>();
                }
                if (!instance)
                    Debug.LogError("创建单例：" + typeof(T).FullName + "失败！");
            }

            IsInitialize = true;
            instance.InitializeCallBack();

            return instance;
        }
	}

    protected virtual void Awake() { }

    /// <summary>
    /// 退出时释放单例
    /// </summary>
    protected virtual void OnApplicationQuit()
    {
        if (instance) instance = null;
    }

    /// <summary>
    /// 初始化后的回调
    /// </summary>
    public virtual void InitializeCallBack() { }
}