Detect if object was destroyed and if yes activate another one

Question

Hello Unity folks. I am trying to create functionallity which will show me one text object only if the another one is detected as a destroyed.

Here you can find what I already tried to do DestroyedChecker class:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class DestroyedChecker : MonoBehaviour
 {
     public GameObject gameTextObject;
     public GameObject gameTextObject2;
 
     void Update()
     {
         if(gameTextObject == null)
         {
             gameTextObject2.SetActive(true);
         }
     }
 }

And TextTimer class which removes the object after 5 seconds:

 using UnityEngine;
 using System.Collections;
 
 public class TextTimer : MonoBehaviour
 {
     public float time = 5;
 
     public void DestroyText()
     {
         Destroy(gameObject, time);
     }
 
 }

First text object disappears after 5 secund as expected but the DestroyedChecker not working here properly and I am not sure why exactly. Any tips?

alt text

Answer 1

Best Answer

Answer by Hellium · Aug 05, 2021 at 11:05 AM

1. Get rid of your DestroyedChecker
2. Replace your TextTimer class by this one

 using UnityEngine;
 using UnityEngine.Events;
 using System.Collections;
 public class TextTimer : MonoBehaviour
 {
     public float time = 5;
     public UnityEvent Destroyed;
 
     public void DestroyText()
     {
         Destroy(gameObject, time);
     }
 
     private void OnDestroy()
     {
         if (Destroyed != null)
             Destroyed.Invoke();
     }
 }

3. A block similar to the OnClick event of the button should appear in the inspector. Drag & drop the gameObject to activate and select GameObject > SetActive and check the chekbox

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matrix1395 · Aug 05, 2021 at 05:25 PM 0

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Thank you @Hellium. This is exactly what I wanted to achieve here.

Answer 2

Answer by AcidmanRPGz · Aug 05, 2021 at 10:45 AM

I haven’t tested this, but try this out:

 if (GameTextObject = null)
     {
     GameTextObject2.SetActive(true);
     }

Or, if you aren’t actually destroying the object, but simply disabling it:

 if (GameTextObject.activeSelf)
         {
         GameTextObject2.SetActive(true);
         }

Tell me if these work when you put them in the update or fixedupdate functions.

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rage_co · Aug 05, 2021 at 10:59 AM 0

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Op is already going with the first approach qnd it isn't working, plus you missed a = mark and for the second method, im pretty sure it will return a null reference exception error since the object has been destroyed

Detect if object was destroyed and if yes activate another one

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