Changing a bool on multiple instances of the same script

Question

I have multiple enemies that use the same script in a scene and this script has a bool that will reset the enemy positions whenever the player enters a new room. I need this bool to be updated from a script attached to the door but I need to change the bool to be true on every instance of the script so every enemy is affected. I only know how to reference the script by mentioning the object it is attached too but this will only affect one instance. So is there an easy way to change every instance at once? Thank you!

Answer 1

You could do away with the bool entirely and use event callbacks. Have your door have

 public UnityEvent onReset;

Then in the inspector you'd be able to add callbacks like you can on UI buttons. You could drag all your enemies into here, then when you need everything to reset, call

 onReset?.Invoke();

But maybe you don't want to drag your enemies into the slots in the inspector, or you instantiate new enemies at runtime. In that case, in your enemy script you could add

 private static event Action onReset;

and a method

 public static void InvokeReset()
 {
 onReset?.Invoke();
 }

if you don't have one already, add a method

 private void OnReset()
 {
 // your reset code here
 }

and then in OnEnable, add

 onReset += OnReset;

and in OnDisable add

 onReset -= OnReset;

Then whenever you want all of your enemies to reset, have your door script (or any script) call EnemyClass.InvokeReset();

Changing a bool on multiple instances of the same script

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