MonoBehaviour.OnDestroy() how it works/ how to use it?

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Hello guys!

I spent a lot of time understanding this function and I did many examples with this function but I didn't reach anything conciliatory so I hope someone can help me.

My question is about uploading scenes: Suppose I have a generic singleton that has this method in it. Why should it has this method in it? I tested it and if I load a single scene the onDestroy function is called and that's correct but if i delete this functin the program still works very good.

 protected virtual void OnDestroy()
 {
      Debug.Log("Destroyed"); 
     if (instance == this)
     {
         instance = null;
     }
 }

Answer 1

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Answer by Houtamelo · Nov 14, 2020 at 07:47 PM

This method makes sure the instance is not a object that is destroyed, which if you try to access will give you a different exception from trying to access a null object. Now i can't answer why your program is still working fine after it's deleted, i'd say it mostly depends on how you are implementing singletons, some implementations automatically create a instance of the object if they can't find one on the scene, this is to make sure there is indeed one instance of this type on the scene.

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stephen_gregory · Nov 26, 2020 at 04:37 PM 0

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Thank you for your answer!(sorry if it's a little late)

MonoBehaviour.OnDestroy() how it works/ how to use it?

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