UnityEvent as a serialized property

Question

I have a field of a GameObject that is a concretized subclass of UnityEvent.

I am trying to write a property drawer for that concretized subclass.

But UnityEventBase does not seem to be a child class of Object so using property.objectReferenceValue does not return anything that I can cast to my sub-class.

How does one get the deserailized property where such a property is a subclass of UnityEvent?

Answer 1

Best Answer

Answer by Jeff-Kesselman · Jul 29, 2015 at 02:32 PM

The answer from Unity support is thus:

UnityEvent is a "normal" class, you should be able to use SerializedProperty.Next() to drill down into its data but not objectReferenceValue.

SO, I guess we have to use the SerializedProperty sub-property parsing function to get at the data.

Add comment · Show 1 · Share

Bunny83 · Jul 29, 2015 at 02:41 PM 0

Share

Yes, "normal" seriaizable classes are serialized along with the containing type. If you force text-serialization in Unity you can look at any prefab or scene asset with a text editor and see how the data is actually structured. Unity can only reference things derived from UnityEngine.Object as they are serialized on their own and get a seperate instance id which can be used to reference the instance.

Answer 2

Answer by Acegikmo · Apr 13, 2016 at 11:58 AM

Here's a workaround that lets you access the proper UnityEvent object instead of just the serialized data

     public UnityEvent GetUnityEvent(object obj, string fieldName){
         if( obj != null ) {
             FieldInfo fi = obj.GetType().GetField(fieldName);
             if( fi != null ) {
                 return fi.GetValue(obj) as UnityEvent;
             }        
         }
         return null;
     }

Add comment · Show 1 · Share

Rimoldi · Apr 09 at 05:51 PM 0

Share

It's important to point out that if the field is private, you also have to pass NonPublic and Instance BindingFlags when using GetField, like this:

 public UnityEvent GetPrivateUnityEvent(object obj, string fieldName){
          if( obj != null ) {
              FieldInfo fi = obj.GetType().GetField(fieldName, BindingFlags.NonPublic | BindingFlags.Instance);
              if( fi != null ) {
                  return fi.GetValue(obj) as UnityEvent;
              }        
          }
          return null;
      }

UnityEvent as a serialized property

2 Replies

Your answer

Follow this Question

Related Questions