Target field of a MonoBehaviour attribute ?

Questions & Answers
1

I have these classes:

public class MyClass : MonoBehaviour{
    [SerializeField]
    MonoBehaviour myOtherMonoBehaviour;
}
public class MyOtherClass : MonoBehaviour{
    [SerializeField]
    float value;
}

I would now like to write a custom inspector for MyClass which checks if myOtherMonoBehaviour is of type MyOtherClass and if so, show its field value in the inspector of MyClass.

How do I write the check for the Type and displaying value in the custom editor ?
I know EditorGUILayout.PropertyField for displaying a property field for a serialized object, but how do I target value, if myOtherMonoBehaviour is of type MyOtherClass ?

2

In general I would advise against it, but (without any eye toward optimization) you can do something like this:

SerializedProperty myOtherMonoBehaviour = serializedObject.FindProperty("myOtherMonoBehaviour");
EditorGUILayout.PropertyField(myOtherMonoBehaviour);
if (myOtherMonoBehaviour.objectReferenceValue != null and myOtherMonoBehaviour.objectReferenceValue is MyOtherClass)
{
    SerializedObject so = new SerializedObject(myOtherMonoBehaviour.objectReferenceValue);
    so.Update();
    EditorGUILayout.PropertyField(so.FindProperty("value"));
    so.ApplyModifiedProperties();
}