싱글톤 패턴 소스코드

기반, 해당씬에서만 유지되는 싱글톤

public class Singleton<T> : MonoBehaviour where T : Singleton<T>
{
    private static T instance;
    public static T Instance
    {
        get
        {
            if(instance == null)
            {
                instance = new GameObject(typeof(T).Name).AddComponent<T>();
            }

            return instance;
        }
    }

    public static bool InstanceExist { get { return instance != null; } }

    protected virtual void Awake()
    {
        if(InstanceExist)
        {
            Destroy(gameObject);
            return;
        }

        instance = (T)this;
    }

    protected virtual void OnDestroy()
    {
        if(instance == this)
        {
            instance = null;
        }
    }
}

 

씬을 넘어가는 싱글톤

public class PersistentSingleton<T> : Singleton<T> where T : Singleton<T>
{
    protected override void Awake()
    {
        base.Awake();
        DontDestroyOnLoad(gameObject);
    }
}