Unity中，基本代码模板GameSys

在Launch中初始化GameSys
在GameSys中初始化游戏中各具体内容（系统、管理器……）

Launch.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Launch : MonoBehaviour
{
    private void Start()
    {
        Init();
    }

    private void OnDestroy()
    {
        MyDestroy();
    }

    private void Init()
    {
        GameSys.Init();
    }

    private void MyDestroy()
    {
        GameSys.Instance?.MyDestroy();
    }

    [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.AfterSceneLoad)]
    private static void CreateLaunch()
    {
        var go = new GameObject(nameof(Launch)).AddComponent<Launch>();
    }
}

GameSys.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class GameSys
{
    public static GameSys Instance { get; private set; }

    private GameSys()
    {
        // 初始化游戏内各具体内容
    }

    public static void Init()
    {
        if (Instance == null)
        {
            Instance = new GameSys();
        }
    }

    public void MyDestroy()
    {
        Instance = null;
    }
}