UnityAction/UnityEvent - remove listener from within delegate

Question

 UnityEvent eventHandler = new UnityEvent();
 UnityAction eventAction = new UnityAction(delegate() {
         if(condition = true) //the condition doesn't matter, its being met
              eventHandler.RemoveListener(eventAction); //parameter shows up red in monodevelop, as if it doesnt exist
 });
 
 eventHandler.AddListener(eventAction);

I understand that trying to remove an event action from within its constructor probably isn't possible, which is why it can't find eventAction. Is there some way i can access the object being constructed so i can specifically remove that listener at a later time or once a condition in the delegate is true? is there a special keyword for it? or is there a better way to handle a function like this?

Answer 1

Best Answer

Answer by Hellium · Apr 10, 2018 at 08:04 PM

As you have guessed, you can't use a variable while it is initialized. You need an additional step:

  UnityEvent eventHandler = new UnityEvent();
  UnityAction eventAction = null ;
  eventAction = new UnityAction(delegate() {
      if(condition == true)
          eventHandler.RemoveListener(eventAction);
  });
  
  eventHandler.AddListener(eventAction);

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UnityAction/UnityEvent - remove listener from within delegate

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