How to make waves of enemys spawn after few seconds.

Question

Hi, I picked up unity less than week ago so I don't realy know what's wrong with this code. I've read that you can't use WaitForSeconds();in Update but I don't know why and I don't know how to do it otherwise. Can somebody help me how should I do it?

 public class Spawning : MonoBehaviour
 {
     public GameObject zombiePrefab;
     int randomSpawnZone;
     float randomPositionX, randomPositionY;
     Vector3 spawnPosition;
     public float enemySpawned = 5f;
     public float enemysToKill = 5;
     public float enemyAddedEveryRound = 1;
     
     void Start ()
     {
         for (int i = 0; i < enemySpawned; i++)
         {
             SpawnNewEnemy();
         }
     }
     
     void Update ()
     {
         EnemyWaveSpawner();
     }
     
     IEnumerator Wait()
     {
         yield return new WaitForSeconds(3);
     }
     
     void SpawnNewEnemy()
     {
         randomSpawnZone = Random.Range(0, 4);
 
         switch (randomSpawnZone)
         {
             case 0:
                 randomPositionX = Random.Range(-10f, 10f);
                 randomPositionY = Random.Range(-6f, -5f);
                 break;
             case 1:
                 randomPositionX = Random.Range(-10f, 10f);
                 randomPositionY = Random.Range(5f, 6f);
                 break;
             case 2:
                 randomPositionX = Random.Range(10f, 11f);
                 randomPositionY = Random.Range(-5f, 5f);
                 break;
             default:
                 randomPositionX = Random.Range(-11f, -10f);
                 randomPositionY = Random.Range(-5f, 5f);
                 break;
         }
         spawnPosition = new Vector3(randomPositionX, randomPositionY, 0f);
         Instantiate(zombiePrefab, spawnPosition, Quaternion.identity);
     }
     
     void EnemyWaveSpawner()
     {
         if (enemysToKill == 0)
         {
             Wait();
             enemySpawned += enemyAddedEveryRound;
             enemysToKill = enemySpawned;
             for (int i = 0; i < enemySpawned; i++)
             {
                 SpawnNewEnemy();
             }
         }
     }
     
 }

Answer 1

Answer by henkehedstrom · Jan 07 at 03:38 PM

You need to write StartCoroutine(COROUTINE()); So instead of calling the Wait function like Wait(); you have to write StartCoroutine(Wait());

You cannot write yield return new WaitForSeconds() in the update function becuse it returns void compared to your Wait function that returns an IEnumerator. I am not that knowledgeable about how coroutines actually work but here are some links if you want to learn more. https://docs.unity3d.com/ScriptReference/MonoBehaviour.StartCoroutine.html https://docs.unity3d.com/ScriptReference/Coroutine.html

Add comment · Share

How to make waves of enemys spawn after few seconds.

1 Reply

Your answer

Follow this Question

Related Questions