Unity Editor error with GUIContent

I have a script that has a public variable of type GUIContent. I'm currently writing an editor script that uses SerializedProperty and SerializedObject. When I tried to use EditorGUILayout.PropertyField(); on the guicontent variable, Unity shows an error:

Code (csharp):

1.  
2. type is not a supported pptr value
3. UnityEditor.SerializedProperty:get_objectReferenceValue()
4. QuitButtonEditor:OnInspectorGUI() (at Assets/Main Assets/Core Game/GUI/Button/Quit Button/Editor/QuitButtonEditor.cs:27)
5. UnityEditor.DockArea:OnGUI()
6.  

So is there anyway to use customeditor on the GUIContent field?

Here's a sample code

Code (csharp):

1.  
2. using UnityEditor;
3. using UnityEngine;
4.  
5. [CustomEditor(typeof(QuitButton))]
6. public class QuitButtonEditor : Editor
7. {
8.     private SerializedObject m_Object;
9.  
10.     private SerializedProperty content;
11.     private SerializedProperty guiPosition;
12.  
13.     private void OnEnable()
14.     {
15.         m_Object = new SerializedObject(target);
16.  
17.         content = m_Object.FindProperty("content");
18.         guiPosition = m_Object.FindProperty("guiPosition");
19.     }
20.  
21.     public override void OnInspectorGUI()
22.     {
23.         //DrawDefaultInspector();
24.  
25.         m_Object.Update();
26.  
27.         // Put a texture selection
28.         content.objectReferenceValue = EditorGUILayout.ObjectField(content.objectReferenceValue, typeof(Texture2D), true,GUILayout.MaxWidth(120), GUILayout.MaxHeight(120));
29.         //EditorGUILayout.PropertyField();
30.  
31.         // Put a Rect box for setting GUI position
32.         EditorGUILayout.PropertyField(guiPosition);
33.  
34.         m_Object.ApplyModifiedProperties();
35.     }
36. }
37.  

 

You obviously want to work with a Texture2D. I don't see a reason for why you should have a GUIContent instead of a Texture2D field. Maybe you have a good reason for that.

WARNING: UNTESTED CODE
I think that should work:

Code (csharp):

1. (content.objectReferenceValue as GUIContent).image = EditorGUILayout.ObjectField((content.objectReferenceValue as GUIContent).image, typeof(Texture2D), true,GUILayout.MaxWidth(120), GUILayout.MaxHeight(120));

Maybe you also need to specify that you are dealing with Texture2D:

Code (csharp):

1. (content.objectReferenceValue as GUIContent).image = EditorGUILayout.ObjectField(((content.objectReferenceValue as GUIContent).image as Texture2D), typeof(Texture2D), true,GUILayout.MaxWidth(120), GUILayout.MaxHeight(120));

If it doesn't work, I hope you get the idea.