i can't invoke a function directly

Question

{

    bool GameEnd = false;

    public float restartDelay = 1f;

    public void GameOver()
    {
        if(GameEnd == false)
        {
            GameEnd = true;
            Debug.Log("GAMEOVER");
            Invoke("Restart", restartDelay);
        }
        
        void Restart()
        {
            SceneManager.LoadScene(SceneManager.GetActiveScene().name);
        }

    }    
}

I want to invoke "restart" with a delay but it shows "it couldn't be called"

what's wrong?

Answer 1

Declare both methods in the class scope: using System.Collections.Generic; public class YourClass: MonoBehaviour { //presumably monobehaviour

    bool GameEnd = false;
    public float restartDelay = 1f;

    private IEnumerator coroutine;

    void Start() {
        coroutine = Restart(); 
    }
    public void GameOver()
    {
        if(GameEnd == false)
        {
            GameEnd = true;
            Debug.Log("GAMEOVER");
            Invoke("Restart", restartDelay);
        }
        StartCoroutine(coroutine);
    } 

    IEnumerator Restart()
    {
        yield return new WaitForSeconds(1f);
        SceneManager.LoadScene(SceneManager.GetActiveScene().name);
    }
}

Not debugged, exmaple just to show you how it works.

Answer 2

Your method is local (== nested) within the GameOver method.

In order to use Invoke it needs to be on class level scope like

bool GameEnd = false;

public float restartDelay = 1f;

public void GameOver()
{
    if(GameEnd == false)
    {
        GameEnd = true;
        Debug.Log("GAMEOVER");
        Invoke(nameof(Restart), restartDelay);
    }
}   

void Restart()
{
    SceneManager.LoadScene(SceneManager.GetActiveScene().name);
}

otherwise Unity won't find it.