Spawning does not wait.

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class Spawner : MonoBehaviour {
5.     bool spawn = true;
6.     public int time = 2;
7.     public GameObject enemyPrefab;
8.     public int i;
9.     public int amount;
10.     // Use this for initialization
11.     void Start () {
12.  
13.     }
14.    
15.     // Update is called once per frame
16.     void Update(){
17.         StartCoroutine(Timer ());
18.    
19.     }
20.     //time the spawner.
21.     IEnumerator Timer(){
22.  
23.         while (spawn){
24.             yield return new WaitForSeconds(time);
25.             time = Random.Range (3,6);
26.             amount = Random.Range (1,4);
27.             StartCoroutine(Spawn(amount));
28.            
29.         }
30.     }
31.     // spawn an amount of enemies.
32.     IEnumerator Spawn(int amount){
33.    
34.         for(i=0;i<amount;i++){
35.             yield return new WaitForSeconds((float)0.2);
36.         Instantiate(enemyPrefab,transform.position,transform.rotation);
37.         }
38.         yield return new WaitForSeconds(time);
39.     }
40. }

The problem is after the first wave of enemies being spawned it goes out of control and does not spawn them on the interval I told it to.

 

Since you are starting your coroutine from update, it will run it about 60 times per second - all the time. You probably want place your coroutine in "Start()".

 

Coroutines run constantly on their own. Maybe put the StartCoroutine(Timer()); in your Start() function instead. It may be building up too much every frame and that's why it's going out of control.

 

Beat me to it I had the same problem when I tried my first Coroutine. It crashed Unity on me every time I tried to run it and I couldn't figure out why. lol.