How to wait in for loop for x second c#

I just started using Unity and I want to build the following function: Currently I press a button which spawns an asteroid outside of the screen, then the asteroid moves through the screen from right to left and finally I destroy the asteroid out of screen. All this is working already. But now I want to change the button function so that it spawns more asteroids delayed by a few seconds. And I don't know how to do that. My Code looks like this at the moment:

public class ButtonSkript : MonoBehaviour
{       
    private Vector3 spawnPosition = new Vector3(15, 0, 0);
    public GameObject planet_001Prefab;
    public GameObject planet_011Prefab; // not in use
    public GameObject planet_017Prefab; // not in use
    public GameObject planet_079Prefab; // not in use
    

    public void ShowJourney()
    {
        int[] asteroids_array = {27, 569, 1293, 37};
        int[] material_type_array = {0, 2, 1, 3}; // not in use
        
        for (int i  = 0; i < asteroids_array.Length; i  ) {
            GameObject a = Instantiate(planet_001Prefab);
            a.transform.position = spawnPosition;
        
            Destroy(a, 3);

            // wait for 3 seconds
        }
    }
}


public class Translate : MonoBehaviour
{
    public float speed = 10.0f;


    // Update is called once per frame
    void Update()
    {
        moveAsteroid(new Vector2(-1, 0));
    }
    
    void moveAsteroid(Vector2 direction)
    {
        transform.Translate(direction * speed * Time.deltaTime);
    }
}

I already tried System.Threading.Thread.Sleep(3000); and I also tryed to build a timer with IEnumarate and yield return new waitForSeconds(3.0f); but both things are not working or I didn't implement it correctly.

It is probably an easy question, but I can't figure it out on my own.

Thanks for the help :)

CodePudding user response：

Trigger a Coroutine that yields for 3 seconds and then spawns the assets.

This will allow for execution to continue to compute the current frame while your coroutine runs in parallel.

Reference: https://docs.unity3d.com/Manual/Coroutines.html

key command: yield return new WaitForSeconds(3.0f);

CodePudding user response：

You can create an async method and wait 3 seconds for each iteration.

Your method will look like this`

public async  Task ShowJourney()
{
    int[] asteroids_array = {27, 569, 1293, 37};
    int[] material_type_array = {0, 2, 1, 3}; // not in use
    
    for (int i  = 0; i < asteroids_array.Length; i  ) {
        GameObject a = Instantiate(planet_001Prefab);
        a.transform.position = spawnPosition;
    
        Destroy(a, 3);

        await Task.Delay(3);
    }