MonoBehaviour单例的另外一种省事的写法

using UnityEngine;

public class CommSystem: SingletonGeneric<CommSystem>
{
    public static string version = "v1.0";
    private static CommSystemStub stub = (new GameObject("CommSystemStub")).AddComponent<CommSystemStub>();
}

public sealed class CommSystemStub : MonoBehaviour
{
    private void Awake()
    {
        DontDestroyOnLoad(gameObject);
    }

    private void Start()
    {
        
    }

    private void Update()
    {
        
    }

    private void OnDestroy()
    {

    }
}

CommSystem是普通的Class

public class SingletonGeneric<T> where T: class, new()
{
    static private T _instance;
    static private readonly object th_safe = new object();
    static public T Instance
    {
        get
        {
            if (_instance == null)
            {
                lock (th_safe)
                {
                    if (_instance == null)
                        _instance = new T();
                }
            }
            return _instance;
        }
    }
}

 下面的改写让泛型单例支持使用Private的构造函数，这样做更严谨:

using System;

public class SingletonGeneric<T> where T: class
{
    static private T _instance;
    static private readonly object th_safe = new object();
    static public T Instance
    {
        get
        {
            if (_instance == null)
            {
                lock (th_safe)
                {
                    if (_instance == null)
                        //_instance = new T();
                        _instance = (T) Activator.CreateInstance(typeof(T), true);
                }
            }
            return _instance;
        }
    }
}