RectTransform custom editor ontop of Unity RectTransform Custom Editor??

Using the code below I lose all the functionality of the current Unity Custom Editor on their RectTransform. How do I keep their exact RectTransform while also adding my own stuff underneath it? I tried Editor.CreateEditor stuff and I kept getting infinite loop crashing when I tried to create Editor based on the RectTransform.

Code (CSharp):

1. using UnityEditor;
2. using UnityEngine;
3. using System.Collections;
4.  
5.  
6. [CustomEditor(typeof(RectTransform))]
7. public class RectTransformEditor : Editor {  
8.    
9.     public override void OnInspectorGUI () {
10.         DrawDefaultInspector ();
11.     }
12. }

 

You need to inherit RectTransformEditor and call base OnInspectorGUI function. Since RectTransformEditor is internal class you need System.Reflection to get editor type, then instantiate it.

Code (CSharp):

1. using UnityEngine;
2. using UnityEditor;
3. using System.Reflection;
4. using System;
5.  
6. [CustomEditor(typeof(RectTransform), true)]
7. public class RectTransformEditor : Editor
8. {
9.     private Editor _editorInstance;
10.  
11.     private void OnEnable()
12.     {
13.         Assembly ass = Assembly.GetAssembly(typeof(UnityEditor.Editor));
14.         Type rtEditor = ass.GetType("UnityEditor.RectTransformEditor");
15.         _editorInstance = CreateEditor(target, rtEditor);
16.     }
17.  
18.     public override void OnInspectorGUI()
19.     {
20.         _editorInstance.OnInspectorGUI();
21.         // ...
22.     }
23. }

 

If you also want to see 'Anchor Indicators' in editor scene, you need to override 'OnSceneGUI' method explicitly as i've shown below.

Code (CSharp):

1. using UnityEngine;
2. using UnityEditor;
3. using System.Reflection;
4. using System;
5.  
6. [CustomEditor(typeof(RectTransform), true)]
7. public class RectTransformEditor : Editor {
8.     private Editor _editorInstance;
9.  
10.     private void OnEnable() {
11.         Assembly ass = Assembly.GetAssembly(typeof(UnityEditor.Editor));
12.         Type rtEditor = ass.GetType("UnityEditor.RectTransformEditor");
13.         _editorInstance = CreateEditor(target, rtEditor);
14.     }
15.  
16.     public override void OnInspectorGUI() {
17.         _editorInstance.OnInspectorGUI();
18.     }
19.  
20.     private void OnSceneGUI() {
21.         MethodInfo onSceneGUI_Method = _editorInstance.GetType().GetMethod("OnSceneGUI", BindingFlags.NonPublic | BindingFlags.Instance);
22.         onSceneGUI_Method.Invoke(_editorInstance, null);
23.     }
24. }

 

Hey I've been using this to add a few extra buttons to the rectransform component and it's so handy, but I keep getting these errors -

SerializedObjectNotCreatableException: Object at index 0 is null

Does anyone know what might cause that?

 

Hey. You need to destroy created editor. It's mentioned in documentation.
In my case I had to call it from OnDisable and OnDestroy from my custom editor script.

 

Ace! Thanks for that