Callback when a prefab asset got updated

Unity Engine
1

I found PrefabUtility.prefabInstanceUpdated but sadly it doesn’t work for the prefab asset itself. Is there any better way to do this than using AssetModificationProcessor?

At the moment I’m using something like this:

public class PrefabModificationProcessor : UnityEditor.AssetModificationProcessor
{
  public static string[] OnWillSaveAssets(string[] paths)
  {
      foreach (string path in paths)
      {
          if (path.EndsWith(".prefab"))
          {
              var prefab = AssetDatabase.LoadAssetAtPath<GameObject>(path);             
              // Do something
          }
      }
      return paths;
  }
}

Which detects prefab changes but it’s weird. The method could be called multiple times for the same prefab when I save the prefab once.

Also how can I modify the prefab when the user just updated it? I tried using the code above but it doesn’t work. The prefab asset doesn’t get updated. I tried PrefabUtility.SavePrefabAsset and setting the asset dirty. No luck.

2

Would also like to know if there is a way to achieve this

3

This is coming in 2020.2, will is solve your problem? Unity - Scripting API: AssetPostprocessor.OnPostprocessPrefab(GameObject root)