WaitForSeconds problem

Unity Engine
1

Hi guys.
I started learning unity using C# yesterday, but I know something about programming (with java).

To learn, I’m trying to develop a simple pong game, but I’ve some trouble with WaitForSeconds.
I think it can be related to the multithread engine.
That’s what i’m doing :

public class BallControl : MonoBehaviour {

    bool wait=false;
   
    void Start (){
        if (!wait) {
            Debug.Log(wait);
            StartCoroutine(hi (5.0f));
            Debug.Log(wait);
        }
        move ();
    }

    IEnumerator hi(float sec){
        Debug.Log("wait for "+sec+" seconds");
        yield return new WaitForSeconds(sec);
        Debug.Log("waited for "+sec+" seconds");
        wait = true;
        }
    void move(){...}
}

When I start the game, the ball does not wait, but the console log is this:

false
false
wait for 5 seconds
waited for 5 seconds

The hi method is called but it seems to be a separated thread.
Any suggestions?

2

Coroutines are there to do exactly this, start something in a separate thread… what are you trying to achieve with this code?

3

The ball should wait and after that, moves.

4

Put the call to move() into your coroutine at the very end.

1 Like
5

Coroutines are executed in the main thread. They are not multithreaded at all.

der_r just gave you the correct hint. move() has to be in the coroutine, immediately after the waiting. I don’t know exactly what the wait flag is supposed to do. As far as I can see it is not needed at all, but maybe you wanted it to do something else.

6

the der_r solution works well, ty.
The wait flag was just for debugging, not other uses.