在Update（）中仅对对象进行一次实例化

Question

I'm trying to instantiate just one prefab inside the method udpate, but the thing is, it's instantiating twice. I don't know how I could solve this problem.

What could I do? I've created a boolean called spawned, but it's not working.

public class SpawnaCasos : MonoBehaviour
{    
    public GameObject[] Casos;

    private GameController gameController;//variável para acessar o script do gamecontroller
    private GameObject controller;
    private bool spawned = false;
    // Start is called before the first frame update
    void Start()
    {
        controller = GameObject.FindGameObjectWithTag("Controller");
        gameController = controller.GetComponent<GameController>();
    }

    // Update is called once per frame
    void Update()
    {
        if (gameController.contadorPontos == 14 && spawned == false)
        {
            Instantiate(Casos[UnityEngine.Random.Range(0, 8)], transform.position, this.transform.rotation);
            spawned = true;
        }
    }
}

Answer 1

public class SpawnaCasos : MonoBehaviour
{    
    public GameObject[] Casos;

    private GameController gameController;
    private GameObject controller;

    void Start()
    {
        controller = GameObject.FindGameObjectWithTag("Controller");
        gameController = controller.GetComponent<GameController>();
        InstantiateCasos();
    }

    void Update()
    {
        if (gameController.contadorPontos == 14)
            InstantiateCasos();
    }
    void InstantiateCasos(){
        Instantiate(Casos[UnityEngine.Random.Range(0, 8)], transform.position, transform.rotation);
    }
}