SPAWNING ENEMIES and controlling the amount/interval

Question

I am trying to spawn enemies from the top of the screen and fall down where they are destroyed at the bottom. How can I change my scipt to control the amount of objects that fall and how often they fall? currently I have methods in place but they dont really seem funtional. See my code below.

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

public class EnemySpawner : MonoBehaviour { [SerializeField] private float xLimit = 0; //spawns single enemy [SerializeField] private float [] xPositions = null; [SerializeField] private GameObject[] enemyPrefabs = null; [SerializeField] private Wave[] wave = null;

 private float currentTime;

 List<float> remainingPositions = new List<float>();
 private int waveIndex;
 float xPos = 0;
 int rand;
 // Start is called before the first frame update
 void Start()
 {
    
     currentTime = 0;
     remainingPositions.AddRange(xPositions);
 }

 // Update is called once per frame
 void Update()
 {
     
     currentTime -=  Time.deltaTime;
     if(currentTime <= 0)
     {
         SelectWave();
     }
 }
 void SpawnEnemy(float xPos)
 {
     //gameObject.transform.GetComponent<Rigidbody2D>().AddForce(Vector2.down*30*Time.deltaTime,ForceMode2D.Force); 
     int r = Random.Range(0,8); //3 types of enemies so increase if needed
     GameObject enemyObj = Instantiate(enemyPrefabs[r], new Vector3(xPos,transform.position.y,0),Quaternion.identity);//can add rotation here
     /*string enemyName = "";
     if (r == 0) enemyName = "realVirus-removebg-preview";
     else if (r == 1) enemyName = "realVirus-removebg-preview (2)";
     else if (r == 2) enemyName = "NormalBlue";
     else if (r == 3) enemyName = "Bomb";
     else if (r == 4) enemyName = "coins";
     else if (r == 5) enemyName = "SlowTime";
     else if (r == 6) enemyName = "Doubler";
     else if (r == 7) enemyName = "Fivex";

     GameObject enemy = ObjectPooling.GetPooledObject(enemyName);
     enemy.transform.position = new Vector3(xPos, transform.position.y,0);
     enemy.SetActive(true);*/
     
 }
 private void SelectWave()
 {
     remainingPositions = new List<float>();
     remainingPositions.AddRange(xPositions);

     waveIndex = Random.Range(0,wave.Length);

     currentTime = wave[waveIndex].delayTime;

     if(wave[waveIndex].spawnAmount == 1)
     {
         xPos = Random.Range(-xLimit,xLimit);
     }
     else if (wave[waveIndex].spawnAmount > 1)
     {
         rand = Random.Range(0, remainingPositions.Count);
         xPos = remainingPositions[rand];
         remainingPositions.RemoveAt(rand); //no overlapping
     }

     for(int i = 0; i < wave[waveIndex].spawnAmount; i++)
     {
         SpawnEnemy(xPos);
         rand = Random.Range(0, remainingPositions.Count);
         xPos = remainingPositions[rand];
         remainingPositions.RemoveAt(rand);
     }
 }

}

[System.Serializable] public class Wave { public float delayTime; public float spawnAmount; },

Answer 1

First Script:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class EnemySpawner : MonoBehaviour
 {
     public static int enemyNum = 0;
     float spawnTime = 1.0f;
     bool spawn = true;
     public GameObject blue;
     // Start is called before the first frame update
     void Start()
     {
         
     }
 
     // Update is called once per frame
     void Update()
     {
         if(enemyNum < 5 && spawn)
         {
             StartCoroutine(spawnEnemy());
         }
     }
     IEnumerator spawnEnemy()
     {
         //spawn your enemy here
         enemyNum += 1;
         spawn = false;
         yield return new WaitForSeconds(spawnTime);
         spawn = true;
     }
 }

Destroy Enemy Script:

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

  public class DestroyEnemy : MonoBehaviour
 {
 // Start is called before the first frame update
 void Start()
 {
     
 }

 // Update is called once per frame
 void Update()
 {
     
 }
 void OnTriggerEnter2D(Collider2D other)
 {
     //your destroy enemy script here
     EnemySpawner.enemyNum -= 1;
 }
 }

SPAWNING ENEMIES and controlling the amount/interval

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