[游戏开发]Unity简单的单例模式

1.非Mono

public class Singleton<T> where T : new()
{
    private static T instance;

    public static T Instance
    {
        get
        {
            if (instance == null)
            {
                instance = new T();
            }
            return instance;
        }
    }
}

2.Mono类

using UnityEngine;

public class SingletonMono<T> : MonoBehaviour where T : MonoBehaviour
{
    private static T instance;

    public static T Instance
    {
        get
        {
            if (instance == null)
            {
                instance = new GameObject(typeof(T).Name).AddComponent<T>();
            }
            return instance;
        }
    }
}

3.Mono类不销毁

using UnityEngine;

public class SingletonMonoDontDestroy<T> : MonoBehaviour where T : MonoBehaviour
{
    private static T instance;

    public static T Instance
    {
        get
        {
            if (instance == null)
            {
                var obj = new GameObject(typeof(T).Name);
                instance = obj.AddComponent<T>();
                DontDestroyOnLoad(obj);
            }
            return instance;
        }
    }
}

如果场景中是手动拖上去的可以加上instance = FindObjectOfType();来判断
用FindObjectsOfType可以判断场景中是否存在多个