Question by PedroBitencourt · Dec 26, 2020 at 02:00 AM · editor editor-scripting properties propertydrawer

Change the color of a variable field if it is empty

I recently saw this post on facebook and i did the same because it would be useful to me, but here it doesn't work...

His code:

alt text Expeted result:

alt text

My code:

 #region Libraries
 
 using System;
 using UnityEditor;
 using UnityEngine;
 
 #endregion
 
 [CustomPropertyDrawer(typeof(WarnIfEmpty))]
 public class FieldCantBeNull : PropertyDrawer
 {
     public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
     {
         WarnIfEmpty warn = attribute as WarnIfEmpty;
         
         if (property.objectReferenceValue == null)
         {
             GUI.color = warn.color;
             EditorGUI.PropertyField(position, property, label);
             GUI.color = Color.white;
         }
         else
         {
             EditorGUI.PropertyField(position, property, label);
         }
     }
 }
 [AttributeUsage(AttributeTargets.Field)]
 public class WarnIfEmpty : PropertyAttribute
 {
     public Color color = Color.red;
 }

My unexpeted result: alt text