How to check if a game object is destroyed from array? And instantiate a new game object when a game object is destroyed?

Question

So I want to be able to know if a game object is destroyed from an array and the array count will be for example is 5, when a game object is destroyed, the count will be then be reduced to four. And if the count is less than 5, I want to be able to instantiate another game object.

This is my code.

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

public class SpawnEnemy : MonoBehaviour {

 public GameObject[] go;
 public Vector3 spawnPosition;
 public int spawnLimit;
 public int spawnCount;
 public bool spawn;
 public float waitTime;
 public float timer;

 void Start(){

 }

 void Update(){
     if(spawn){
         timer += Time.deltaTime;
         if (timer > waitTime) {
             if (spawnCount < spawnLimit) {
                 Spawn ();
                 timer = 0.0f;
             } else {
                 spawn = false;
                 Debug.Log ("Spawn limit has been reached!");
             }
         }
     }
 }

 void Spawn(){
     GameObject gos = go [Random.Range(0, go.Length)];
     Instantiate (gos, spawnPosition, Quaternion.Euler (90, 0, 0));
     spawnCount++;
     Debug.Log ("Spawned game object #" + spawnCount);
 }

}

Answer 1

You could create another script assignable to the spawned object that notifies SpawnEnemy when it's destroyed (or just handle it inside your enemy AI script when it dies/is destroyed).

Here would be your SpawnEnemy:

 using UnityEngine;
 
 public class SpawnEnemy : MonoBehaviour
 {
     public GameObject[] go;
     public Vector3 spawnPosition;
     public int spawnLimit;
     public float waitTime;
 
     bool spawn;
     float timer;
     int spawnCount;
 
     void Update()
     {
         if (spawn)
         {
             timer += Time.deltaTime;
             if (timer > waitTime)
             {
                 if (spawnCount < spawnLimit)
                 {
                     Spawn();
                     timer = 0.0f;
                 }
                 else
                 {
                     spawn = false;
                     Debug.Log("Spawn limit has been reached!");
                 }
             }
         }
     }
 
     void Spawn()
     {
         GameObject gos = go[Random.Range(0, go.Length)];
         GameObject spawned = Instantiate(gos, spawnPosition, Quaternion.Euler(90, 0, 0));
         spawnCount++;
         SpawnedObject spawnedObject = spawned.AddComponent<SpawnedObject>();
         spawnedObject.spawner = this;
         Debug.Log("Spawned game object #" + spawnCount);
     }
 
     public void Despawn()
     {
         spawnCount--;
         spawn = true;
     }
 }

and here is a sample script to notify SpawnEnemy:

 using UnityEngine;
 
 public class SpawnedObject : MonoBehaviour
 {
     public SpawnEnemy spawner;
 
     void OnDestroy()
     {
         if (spawner != null)
             spawner.Despawn();
     }
 }

How to check if a game object is destroyed from array? And instantiate a new game object when a game object is destroyed?

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