Unity 单例模式写法

普通类的写法

public class LanguageManager : MonoBehaviour
{
    private static LanguageManager _instance;
    
    public static LanguageManager Instance() {
        if (_instance == null) {
            _instance = FindObjectOfType<LanguageManager>();
            if (_instance == null) {
                GameObject go = new GameObject(typeof(LanguageManager).Name);
                 _instance= go.AddComponent<LanguageManager>();
            }
        }
        return _instance;
    }
      
}

扩展成一个单例的工具类

using UnityEngine;


/// <summary>
/// MonoBehaviour单例
/// </summary>
/// <typeparam name="T"></typeparam>
public abstract class SingletonMonoBehaviour<T> : MonoBehaviour where T : SingletonMonoBehaviour<T>
{
    private static T m_Instance;
    public static T Instance
    {
        get
        {
            if (m_Instance == null)
            {
                //查找场景是否增加了该类
                m_Instance = FindObjectOfType<T>();
                if (m_Instance == null)
                {
                    GameObject singletonObject = new GameObject { name = typeof(T).Name };
                    m_Instance = singletonObject.AddComponent<T>();
                    DontDestroyOnLoad(singletonObject);
                }
            }

            return m_Instance;
        }
    }

    public static T getInstance()
    {
        return m_Instance;
    }

    protected virtual void OnDestroy()
    {
        m_Instance = null;
    }

}

使用该类的就是

public class LogToFile : SingletonMonoBehaviour<LogToFile>
{
}