WaitForSeconds Error

Questions & Answers
1

Hey! I’ve been trying to spawn enemies every five seconds with Instantiate, but the code keeps on giving me an error when I try. Any answers?

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Spawn : MonoBehaviour {

public float startPositionX;
public float startPositionY;
public float startPositionZ;
public GameObject enemyObject;

void Start () 
{		
	for(int i = 0; i < 10; i++)
	{
		Instantiate(enemyObject, new Vector3(0, startPositionY, Random.Range(0f, -20f)), Quaternion.identity);
		StartCoroutine(Wait);
	}
}

IEnumerator Wait()
{
	yield return new WaitForSeconds(5);
}

}

2

A coroutine is executed on a separated thread, so your code in your for won’t wait for 5 seconds and will spawn all enemies in one frame.

If you want to spawn enemies with a 5 seconds delay, you need to put the Instantiate function in a coroutine as well.

For example, something like

    IEnumerator Wait()
    {
         for(int i = 0; i < 10; i++)
         {
             Instantiate(enemyObject, new Vector3(0, startPositionY, Random.Range(0f, -20f)), Quaternion.identity);
             yield return new WaitForSeconds(5);
         }
    }
`

and your Start function will look like something like this 

    void Start()
    {
         StartCoroutine(Wait());
    }

(Note that if the code you provided you forgot the "()" after your method name in StartCoroutine)

Hope this helps ! 
`
3

That helped! Thanks so much! Million hugs!