C#单例模式要点

核心：

1.定义一个静态的对象，在外界访问，在内部构建

2.构造方法私有化

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class UIManager
{
    private static UIManager _instance = null;
    public static UIManager Instance
    {
        get
        {
            if (_instance == null)
            {
                _instance = new UIManager();
            }
            return _instance;
        }
    }
 
    private UIManager()
    {
 
    }
}