Question by Firestar9114 · Feb 27, 2019 at 07:31 PM · c#prefab editor-scripting

Why is my prefab check failing?

So, I have added a callback to PrefabUtility.prefabInstanceUpdated and in it I do a check,

     public bool CheckIfIsPrefab()
     {
         PrefabStage prefabStage = PrefabStageUtility.GetPrefabStage(gameObject);
         IsPrefab = (prefabStage != null);
         return IsPrefab;
     }

However this seems to always be returning false... that seems wrong. Shouldn't this evaluate to true if a prefab was updated? This gets called on the get compontent of the gameObject that the callback passes in, for example:

 [InitializeOnLoad]
 public class Autorun
 {
     static Autorun()
     {
         EditorApplication.update += RunOnce;
     }
 
     static void RunOnce()
     {
         Item.SyncGUIDS();
         PrefabUtility.prefabInstanceUpdated = new PrefabUtility.PrefabInstanceUpdated(PrefabInstanceUpdated);
         EditorApplication.update -= RunOnce;
     }
 
     public static void PrefabInstanceUpdated(UnityEngine.GameObject gameObject)
     {
         Item item = gameObject.GetComponent<Item>();
         if(item!=null)
         { 
             item.CheckIfIsPrefab();
             if (item.IsPrefab==false)
             {
                 Debug.Log("instance callback: " + item);
             }
             else
             {
                 Debug.Log("prefab callback: " + item);
             }
         }
     }
 }

Is this somehow related to this behavior with the new nested prefab system and prefab stages? https://answers.unity.com/questions/1604161/why-does-onvalidate-get-called-multiple-times-for.html

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