Wave Spawner not working ｜Does not detect if an object is destroyed

Question

Hey, I have a question regarding this script. I have watched this tutorial several times but I can't detect the error. Can someone help me? The script is spawning 2 Enemies like i said it should do, but its not detecting if delete these Enemies. I appreciate any answer. Thanks in advance! Finn Part 1 https://www.youtube.com/watch?v=Vrld13ypX_I Part 2 https://www.youtube.com/watch?v=q0SBfDFn2Bs

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class WaveSpawner : MonoBehaviour {
 
 
     public enum SpawnState { Spawning, Waiting, Counting } // state of the Wave
 
     [System.Serializable]
     public class Wave
     {
 
 
         public string name; //wave name: Easy
         public Transform enemy; //Which Prefab should be spawned: Enemy
         public int count; //how much Enemys should be spawned per wave: 6
         public float rate; //how often the count of enemies should spawn
 
     }
 
     public Wave[] waves;
     private int nextWave = 0;
 
     public float timeBetweenWaves = 5f; //Time between waves: 5f = 5seconds
     public float waveCountdown; //time Counting down to next wave: 3... 2... 1...
     private float searchCountdown = 1f; // how long to search for alive enemies
     private SpawnState state = SpawnState.Counting;
     void Start()
     {
         waveCountdown = timeBetweenWaves;
     }
 
     void Update()
     {
         if (state == SpawnState.Waiting) //starts method to check if enemies are still alive
         {
             searchCountdown = 1f; //search countdown 1s
             if (!EnemyIsAlive())
             {
                 //begin a new Wave
                 Debug.Log("Wave Completed!");
                 return;
             }
             else
             {
                 return;
             }
 
         }
 
 
 
 
         if (waveCountdown <= 0) //ask if ready for new Wave
         {
             if (state != SpawnState.Spawning) //ask if Waves are already spawning
             {
                 StartCoroutine( SpawnWave ( waves[nextWave] ) ); //start Spawning Routine
             }
         }
         else
         {
             waveCountdown -= Time.deltaTime; //if not count down
         }
     }
 
     bool EnemyIsAlive() //method to search for living enemies
     {
         searchCountdown -= Time.deltaTime; //count down search time
         if (searchCountdown <= 0f) //if search countdown = 0
         {
             if (GameObject.FindGameObjectWithTag("Enemy") == null) //check if enemy is alive
             {
                 return false; //enemies arent allive
             }
 
         }
         return true; // enemies are allive
     }
 
 
 
 
 
     IEnumerator SpawnWave (Wave _wave) //Spawning Routine
     {
     Debug.Log("Spawning Wave: " + _wave.name);
         state = SpawnState.Spawning; //State: Spawning
         
         for (int i = 0; i < _wave.count; i++) //loop through amount of enemy
         {
             SpawnEnemy(_wave.enemy); //spawn enemy Method
             yield return new WaitForSeconds(1f / _wave.rate); //time between spawning of each enemy
         }
         state = SpawnState.Waiting; //State: Waiting
     yield break; //stop
     }
 
     void SpawnEnemy (Transform _enemy) //spawn enemy Method
     {
     Debug.Log("Spawning Enemy: " + _enemy.name);
     Instantiate(_enemy, transform.position, transform.rotation);
     }
 }

Answer 1

I think EnemyIsAlive() is returning the wrong value, I've made some changes and adjustments, hope it helps.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class WaveSpawner: MonoBehaviour
 {
 
     public enum SpawnState { Spawning, Waiting, Counting, Finished } // State of the wave
 
     [System.Serializable] public class Wave
     {
         public string name = "Easy";      // Wave name: Easy
         public Transform enemy = null;    // Which prefab should be spawned: Enemy
         public int count = 6;             // How much enemys should be spawned per wave: 6
         public float rate = 3;            // How often the count of enemies should spawn
     }
 
     public Wave[] waves = null;
     public float timeBetweenWaves = 5f;   // Time between waves: 5f = 5 seconds
     public int countdownFrom = 3;         // The number which countdown starts from
     public int waveCountdown = 0;         // Time Counting down to next wave: 3... 2... 1...
 
     private int waveIndex = 0;
     private int enemyIndex = 0;
     private float timer = 0;
     private SpawnState state = SpawnState.Counting;
     private string enemyTag = "Enemy";
 
     private void Start()
     {
         waveIndex = 0;
         enemyIndex = 0;
         state = SpawnState.Waiting;
         waveCountdown = 0;
         timer = 0;
         if(waves == null || waves.Length == 0)
         {
             state = SpawnState.Finished;
         }
     }
 
     void Update()
     {
         if(state == SpawnState.Finished)
         {
             return;
         }
 
         switch (state)
         {
             case SpawnState.Spawning:
                 if(enemyIndex >= waves[waveIndex].count)
                 {
                     enemyIndex = 0;
                     waveIndex++;
                     state = SpawnState.Waiting;
                     Debug.Log("Wave spawned.");
                     if (waveIndex < waves.Length)
                     {
                         Debug.Log("Waiting for the next wave.");
                     }
                     else
                     {
                         Debug.Log("That was the last wave.");
                     }
                 }
                 else
                 {
                     if(timer >= waves[waveIndex].rate)
                     {
                         timer = 0;
                         waveCountdown = countdownFrom;
                         enemyIndex++;
                         SpawnEnemy(waves[waveIndex].enemy);
                     }
                     else
                     {
                         timer += Time.deltaTime;
                     }
                 }
                 break;
             case SpawnState.Waiting:
                 if (waveIndex >= waves.Length)
                 {
                     if (!EnemyIsAlive())
                     {
                         state = SpawnState.Finished;
                         Debug.Log("All Waves Completed. Level finished.");
                     }
                 }
                 else
                 {
                     if (timer >= timeBetweenWaves)
                     {
                         timer = 0;
                         waveCountdown = countdownFrom;
                         state = SpawnState.Counting;
                         Debug.Log("Countdown started.");
                     }
                     else
                     {
                         timer += Time.deltaTime;
                     }
                 }
                 break;
             case SpawnState.Counting:
                 if (timer >= countdownFrom)
                 {
                     timer = 0;
                     waveCountdown = 0;
                     state = SpawnState.Spawning;
                     Debug.Log("Countdown finished. Spawning new wave.");
                 }
                 else
                 {
                     timer += Time.deltaTime;
                     waveCountdown = countdownFrom - Mathf.FloorToInt(timer);
                 }
                 break;
         }
     }
 
     private bool EnemyIsAlive() // Method to search for living enemies
     {
         GameObject[] objects = GameObject.FindGameObjectsWithTag(enemyTag);
         return objects != null && objects.Length > 0;
     }
     
     private void SpawnEnemy(Transform _enemy) // Spawn enemy Method
     {
         Transform enemy = Instantiate(_enemy, transform.position, transform.rotation);
         enemy.tag = enemyTag;
         Debug.Log("Enemy spawned: " + _enemy.name);
     }
 
 }

Wave Spawner not working ｜Does not detect if an object is destroyed

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