Instantiate a script into an instantiated prefab

Question

Hello, I have a prefab called 'Enemy' and I wanted to instantiate it with an existing script as a new script for new variables ! Like instantiate the script into the instance of the 'Enemy' to acces new variables !

I tried to found the answer but that takes me one day of time...! I code in C#

Thanks to everyone in advance ! :)

Answer 1

Thanks to @UnityCoach for helping me through this !!!

Here's my 2 scripts :

Bullet Script :

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Bullet : MonoBehaviour
 {
     public float damage = 0.000092f;
     private static int numberOfEnemyCollisions;
 
     // use OnEnable to reset values, if you come to use some Object Pooling as Awake and Start will only ba called once
     private void OnEnable()
     {
         damage = 0.000092f;
         numberOfEnemyCollisions = 0;
     }
 
     public void OnTriggerEnter2D(Collider2D Col)
     {
         if (Col.tag == "Enemy" || Col.tag == "Enemy2")
         {
             numberOfEnemyCollisions += 1;
 
                 Col.gameObject.SendMessage("ApplyDamage", damage, SendMessageOptions.RequireReceiver); // send a message to the enemy gameobject that has an ApplyDamage (float damage) method
                 damage /= 2.25f; // divide the damage every time you hit
             
             if (numberOfEnemyCollisions == BulletPenetration.NumOfCol)
             {
                 Destroy(gameObject, 0.1f);
                 numberOfEnemyCollisions = 0;
             }
  // destroy the bullet if its damage has come under a given threshold
         }
 
         if (Col.tag == "Wall")
         {
             Destroy(gameObject);
         }
     }
 
     IEnumerator SetTo0()
     {
         yield return new WaitForSeconds(1);
     }
 }

Enemy script :

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class Enemy : MonoBehaviour
 {
     public float health = 0.0003f;
     public Slider slidemyins;
     public float EnemyLifeMAX;
 
     // damage property to handle damage and destruction
     private float _damage;
     public float Damage
     {
         get { return _damage; }
         set
         {
             if (value != _damage)
             {
                 _damage = value;
 
                 if (_damage > health)
                     Destroy(gameObject); // destroy when damage reaches a critical level
             }
         }
     }
 
     // messages can be private, just like other builtin messages like Start and Update
     private void ApplyDamage(float damage)
     {
         Damage += damage;
     }
 
     private void Start()
     {
         slidemyins = GetComponentInChildren<Slider>();
         gameObject.GetComponent<Enemy>().EnemyLifeMAX = 0.0003f;
         gameObject.GetComponent<Enemy>().health = 0.0003f;
     }
 
     private void Update()
     {
         slidemyins.GetComponent<Slider>().maxValue = EnemyLifeMAX;
         slidemyins.GetComponent<Slider>().value = _damage;
     }
 }

Answer 2

Answer by UnityCoach · Feb 18, 2017 at 09:17 AM

If you instantiated an object that already has the script, you can get it with GetComponent. Like :

 public Stuff InstantiateNewStuff (Stuff stuff)
 {
     GameObject g = Instanciate (stuff.gameObject);
     return g.GetComponent<Stuff>();
 }

If the game object doesn't have it, you can simply add it :

 GameObject newGameObject = Instanciate (prefabReference);
 newGameObject.AddComponent<Stuff>();

Add comment · Show 4 · Share

Voyder_Rozann · Feb 18, 2017 at 12:15 PM 0

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@UnityCoach I've tried that ! But what I wanted is to instantiate the script itself ! I've tried too to make multiple scripts with the same components of my first script... But that did not work at all !

UnityCoach Voyder_Rozann · Feb 18, 2017 at 01:12 PM 1

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You can instantiate the script itself, by simply allocating one like Stuff stuff = new Stuff (); but you won't be able to add it to a GameObject as AddComponent doesn't take an instance for parameter, so it'll be useless. Usually you add the component and modify its values right after, like :

 Stuff stuff = newGameObject.AddComponent<Stuff>();
 stuff.myVar = value;

Can you tell a little more on what you want to achieve?

UnityCoach Voyder_Rozann · Feb 18, 2017 at 03:22 PM 1

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Here's some sample code that will help you architecture this :

 public class Bullet : MonoBehaviour
 {
     public float damage = 10f;
     private int numberOfEnemyCollisions;
 
     // use OnEnable to reset values, if you come to use some Object Pooling as Awake and Start will only ba called once
     private void OnEnable ()
     {
         damage = 10;
         numberOfEnemyCollisions = 0;
     }
 
     public void OnTriggerEnter2D (Collider2D Col)
     {
         if (Col.tag == "Enemy" || Col.tag == "Enemy2")
         {
             Col.gameObject.SendMessage ("ApplyDamage", damage, SendMessageOptions.RequireReceiver); // send a message to the enemy gameobject that has an ApplyDamage (float damage) method
             damage /= 3; // divide the damage every time you hit
 
             if (damage <= 1)
                 Destroy (gameObject); // destroy the bullet if its damage has come under a given threshold
         }
 
         if (Col.tag == "Wall")
         {
             Destroy(gameObject);
         }
     }
 }
 
 public class Enemy : MonoBehaviour
 {
     public float health = 100f;
 
     // damage property to handle damage and destruction
     private float _damage;
     public float Damage
     {
         get { return _damage; }
         set
         {
             if (value != _damage)
             {
                 _damage = value;
 
                 if (_damage > health)
                     Destroy (gameObject); // destroy when damage reaches a critical level
             }
         }
     }
 
     // messages can be private, just like other builtin messages like Start and Update
     private void ApplyDamage (float damage)
     {
         Damage += damage;
     }
 }

Voyder_Rozann UnityCoach · Feb 18, 2017 at 05:33 PM 0

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How can I accept your response ?... Because I found what I needed !!! Thank you !

Answer 3

@UnityCoach In this case, i want my bullet 'penetration' to, everytime OnTriggerEnter2D collide an enemy, divide the Damage do to the enemy by 2 every next enemy the bullet collide ! But when I shoot, the bullet appear, the bullet do damage, But right next, I shoot the second bullet that takes the count of my first bullet

Here's my Bullet script :

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Shoot2 : MonoBehaviour
 {
     public static float ColliderNum;
     public float ActualCount;
     public static float DivDamage;
     private void Start()
 
     {
         DivDamage = 1f;
         ColliderNum = 0f;
     }
 
     public void OnTriggerEnter2D(Collider2D Col)
     {
         if (Col.tag == "Enemy" || Col.tag == "Enemy2")
         {
             DivDamage += 1f;
             ColliderNum += 1f;
 
             if (ColliderNum == BulletPenetration.NumOfCol)
             {
                 DivDamage = 1f;
                 ColliderNum = 0f;
                 Destroy(gameObject);
             }
         }
 
         if (Col.tag == "Wall")
         {
             DivDamage = 1f;
             ColliderNum = 0f;
             Destroy(gameObject);
         }
     }
 }

Here's my Bullet Penetration Script :

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class BulletPenetration : MonoBehaviour
 {
     public float PRICE4;
     public float HM4;
     public Text text4;
     public Button bouton4;
     public Color colorgreen;
     public static float NumOfCol;
     
     private void Start()
     {
         NumOfCol = 1f;
 
         PRICE4.ToString("n2");
         colorgreen.g = 0.5f;
         bouton4.image.color = Color.red;
 
         PRICE4 = PlayerPrefs.GetFloat("PRICE4", 0.89f);
         HM4 = PlayerPrefs.GetFloat("HM4", 0f);
     }
 
     private void OnDestroy()
     {
         PlayerPrefs.SetFloat("PRICE4", PRICE4);
         PlayerPrefs.SetFloat("HM4", HM4);
     }
 
     private void Update()
     {
         if (EUROSARGENT.EUROS <= PRICE4)
         {
             bouton4.image.color = Color.red;
         }
         else if (EUROSARGENT.EUROS >= PRICE4)
         {
             bouton4.image.color = colorgreen;
         }
 
         text4.text = ("Bullet P Lenght" + ("\n€=" + PRICE4) + ("\nYou Bought " + HM4));
     }
 
     public void Buy004()
     {
         if (EUROSARGENT.EUROS >= PRICE4)
         {
             EUROSARGENT.EUROS -= PRICE4;
             PRICE4 = Mathf.Round(PRICE4 * 110f) / 100f;
             HM4 += 1f;
             NumOfCol += 1;
         }
     }
 }

And Here's my EnemySpawn script :

 using System;
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class EnemySpawn : MonoBehaviour
 {
     public Slider slidemyins;
     public float speed;
     public float EnemyLifeMAX;
     public float EnemyLife;
     public float EnemyLifeODD;
     public float DoPlayerDamage;
     public static float DoEnemyDamage;
     public float bulletdamage;
 
     IEnumerator PlayerDamage()
     {
         yield return new WaitForSeconds(0.94f);
         PlayerShoot.PlayerHealth -= DoPlayerDamage;
         yield return PlayerDamage();
     }
 
     private void OnTriggerEnter2D(Collider2D col)
     {
         if (col.tag == "Bullet")
         {
             EnemyLifeODD -= bulletdamage / Shoot2.DivDamage;
         }
 
         if (col.tag == "Player")
         {
             gameObject.GetComponent<EnemySpawn>().speed = 0.0001f;
             StartCoroutine(PlayerDamage());
         }
         else
         {
             StopCoroutine(PlayerDamage());
             gameObject.GetComponent<EnemySpawn>().speed = 50f;
         }
     }
 
     void Start()
     {
         speed = 50f;
         DoPlayerDamage = 0.00001f;
         EnemyLifeMAX = 0.0003f;
         EnemyLife = 0.0003f;
         EnemyLifeODD = 0.0003f;
         slidemyins.GetComponent<Slider>();
     }
 
     void Update()
     {
         bulletdamage = BulletDamage.DEALENEMYDAMAGE;
 
         slidemyins.GetComponent<Slider>().maxValue = EnemyLifeMAX;
         slidemyins.GetComponent<Slider>().value = EnemyLifeODD;
 
         Vector2 Position = transform.position;
         Position = new Vector2(Position.x - speed * Time.deltaTime, Position.y);
         transform.position = Position;
 
         if (gameObject.GetComponent<EnemySpawn>().EnemyLifeODD <= 0)
         {
             gameObject.SetActive(false);
             EUROSARGENT.GetTheMoney();
         }
     }
 }

Instantiate a script into an instantiated prefab

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