Unity中的MonoSingleton＜T＞与Singleton＜T＞

1.MonoSingleton

代码部分

using UnityEngine;/// <summary>
/// MonoBehaviour单例基类
/// 需要挂载到GameObject上使用
/// </summary>
public class MonoSingleton<T> : MonoBehaviour where T : MonoSingleton<T>
{private static T _instance;private static readonly object _lock = new object();private static bool _applicationIsQuitting = false;public static T Instance{get{if (_applicationIsQuitting){Debug.LogWarning($"[MonoSingleton] Instance '{typeof(T)}' already destroyed on application quit. Won't create again.");return null;}lock (_lock){if (_instance == null){_instance = FindObjectOfType<T>();if (_instance == null){GameObject singletonObject = new GameObject();_instance = singletonObject.AddComponent<T>();singletonObject.name = typeof(T).ToString() + " (Singleton)";// 可选：让单例对象在场景切换时不被销毁//DontDestroyOnLoad(singletonObject);}}return _instance;}}}protected virtual void Awake(){if (_instance == null){_instance = this as T;DontDestroyOnLoad(gameObject);}else if (_instance != this){Debug.LogWarning($"Another instance of {typeof(T)} already exists. Destroying this one.");Destroy(gameObject);}}protected virtual void OnApplicationQuit(){_applicationIsQuitting = true;}protected virtual void OnDestroy(){if (_instance == this){_instance = null;}}
}

说明

继承MonoSingleton的物体需要能挂载到场景物体上，即继承MonoBehaviour

我在MonoSingleton中将DontDestroyOnLoad(singletonObject)取消掉了，如果需要跨场景的话需要在继承的脚本中重写Awake方法

protected override void Awake()
{base.Awake();DontDestroyOnLoad(gameObject);
}

2.Singleton

代码部分

/// <summary>
/// 纯C#单例基类
/// 不需要挂载到GameObject上，可以直接调用
/// </summary>
public class Singleton<T> where T : class, new()
{private static T _instance;private static readonly object _lock = new object();public static T Instance{get{if (_instance == null){lock (_lock){if (_instance == null){_instance = new T();}}}return _instance;}}protected Singleton() { }
}