Double Array (Custom Editor)

Getting Started
,
1

Basicly, what I am trying to do, is to display a double array as one.
Let me explain better.
→ First I have a list of strings

[HideInInspector]
public List<string> ThemesList = new List<string>();

–>Then in the custom Editor I display it as a Drop Down Menu

GUIContent themeList = new GUIContent("Theme Mode");
code.SelecteedThemeIndex = EditorGUILayout.Popup(themeList, code.SelecteedThemeIndex, code.ThemesList.ToArray());

(code.SelecteedThemeIndex being my choice, (everything works just fine here))
→ Now I have an array of Images

public Image[][] ThemeArray = new Image[5][];

’ 5 ’ being the maximum allowed number.
→ to display it, In custom Editor I use

Image[][] array = code.ThemeArray;

            code.showImages = EditorGUILayout.Foldout(code.showImages, "Themes List");
            if (code.showImages)
            {
                EditorGUI.indentLevel++;
                code.ObjectSize = Mathf.Max(0, EditorGUILayout.IntField("Size", code.ObjectSize));

                for (int i = 0; i < code.ObjectSize; i++)
                {
                    array[code.SelecteedThemeIndex][i] = (Image)EditorGUILayout.ObjectField("Theme " + i, array[code.SelecteedThemeIndex][i], typeof(Image), true);
                }

                EditorGUI.indentLevel--;
            }

I am trying to show in inspector an array of images, based on the selected Index.
(ex. on Index 0, there will be 3 images (img 1, img 2, img 3)
on Index 1, there will be also 3 images (img 1, img 4, img 5)
and I can switch the Index through the drop down menu, and the images(aka Arrays) will be swaped)

Until now, if I set the ObjectSize to anything but ’ 0 ’ it gives me this error

7033279--833530--2021-04-13 10_09_58-.png
7033279--833530--2021-04-13 10_09_58-.png1915×178 22.1 KB

In Visual Studio (2019) there are no errors.

If you need the full code there it is:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using UnityEngine.UI;

public class ThemesCoder : MonoBehaviour
{
    [HideInInspector]
    public List<string> ThemesList = new List<string>();
    [HideInInspector]
    public List<Image> Theme = new List<Image>();
    [HideInInspector]
    public int SelecteedThemeIndex = 0;
    [HideInInspector]
    public bool showList = false;
    [HideInInspector]
    public bool showImages = false;
    [HideInInspector]
    public Image[][] ThemeArray = new Image[5][];
    [HideInInspector]
    public int ObjectSize = 0;
    [HideInInspector]
    public int size = 0;

    [CustomEditor(typeof(ThemesCoder))]
    //[CanEditMultipleObjects]
    public class ThemeCoderEditor : Editor
    {
        public override void OnInspectorGUI()
        {
            base.OnInspectorGUI();

            DrawInspector();
        }

        public void DrawInspector()
        {
            ThemesCoder code = (ThemesCoder)target;

            #region Themes Modes List
          
           
            code.showList = EditorGUILayout.Foldout(code.showList, "Themes List");
            if (code.showList)
            {
                EditorGUI.indentLevel++;
                List<string> list = code.ThemesList;
                code.size = Mathf.Max(0, EditorGUILayout.IntField("Size", list.Count));

                while (code.size > list.Count)
                {
                    list.Add(null);
                }

                while (code.size < list.Count)
                {
                    list.RemoveAt(list.Count - 1);
                }

                for (int i = 0; i < list.Count; i++)
                {
                    list[i] = EditorGUILayout.TextField("Theme " + i, list[i]);
                }
                EditorGUI.indentLevel--;
            }
            #endregion

            #region Curent Mode
            GUIContent themeList = new GUIContent("Theme Mode");
            code.SelecteedThemeIndex = EditorGUILayout.Popup(themeList, code.SelecteedThemeIndex, code.ThemesList.ToArray());
            #endregion

            EditorGUILayout.Space();

            #region Theme Game Object
           
            Image[][] array = code.ThemeArray;

            code.showImages = EditorGUILayout.Foldout(code.showImages, "Themes List");
            if (code.showImages)
            {
                EditorGUI.indentLevel++;
                code.ObjectSize = Mathf.Max(0, EditorGUILayout.IntField("Size", code.ObjectSize));

                for (int i = 0; i < code.ObjectSize; i++)
                {
                    array[code.SelecteedThemeIndex][i] = (Image)EditorGUILayout.ObjectField("Theme " + i, array[code.SelecteedThemeIndex][i], typeof(Image), true);
                }

                EditorGUI.indentLevel--;
            }
            #endregion
        }
    }
}

Hope you can help me.
Thank You anticiped.

2

So I resolved this problem, looks like when declaring the Array you must make it to null as default.
The code as for an example is here

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using UnityEngine.UI;

public class ThemesCoder : MonoBehaviour
{
    [HideInInspector]
    public SpriteArray[] ThemeArray = null;
    [HideInInspector]
    public List<string> ThemesList = new List<string>();
    [HideInInspector]
    public List<Image> Theme = new List<Image>();
    [HideInInspector]
    public int SelecteedThemeIndex = 0;
    [HideInInspector]
    public bool showList = false;
    [HideInInspector]
    public bool showImages = false;
   
    [HideInInspector]
    public int ObjectSize = 0;
    [HideInInspector]
    public int size = 0;

    [CustomEditor(typeof(ThemesCoder))]
    //[CanEditMultipleObjects]
    public class ThemeCoderEditor : Editor
    {
        public override void OnInspectorGUI()
        {
            base.OnInspectorGUI();

            DrawInspector();
        }

        public void DrawInspector()
        {
            ThemesCoder code = (ThemesCoder)target;

            #region Themes Modes List
          
           
            code.showList = EditorGUILayout.Foldout(code.showList, "Themes List");
            if (code.showList)
            {
                EditorGUI.indentLevel++;
                List<string> list = code.ThemesList;
                code.size = Mathf.Max(0, EditorGUILayout.IntField("Size", list.Count));

                while (code.size > list.Count)
                {
                    list.Add(null);
                }

                while (code.size < list.Count)
                {
                    list.RemoveAt(list.Count - 1);
                }

                for (int i = 0; i < list.Count; i++)
                {
                    list[i] = EditorGUILayout.TextField("Theme " + i, list[i]);
                }
                EditorGUI.indentLevel--;
            }
            #endregion

            #region Curent Mode
            GUIContent themeList = new GUIContent("Theme Mode");
            code.SelecteedThemeIndex = EditorGUILayout.Popup(themeList, code.SelecteedThemeIndex, code.ThemesList.ToArray());
            #endregion

            EditorGUILayout.Space();

            #region Theme Game Object
           
            SpriteArray[] array = code.ThemeArray;

            code.showImages = EditorGUILayout.Foldout(code.showImages, "Themes List");
            if (code.showImages)
            {
                EditorGUI.indentLevel++;
                code.ObjectSize = Mathf.Max(0, EditorGUILayout.IntField("Size", code.ObjectSize));

                for (int i = 0; i < code.ObjectSize; i++)
                {
                   
                    array[code.SelecteedThemeIndex].Sprites[i] = (Sprite)EditorGUILayout.ObjectField("Theme " + i, array[code.SelecteedThemeIndex].Sprites[i], typeof(Sprite), true);

                }
                EditorGUI.indentLevel--;
            }
            #endregion
        }
    }
}

[System.Serializable]
public struct SpriteArray
{
    public Sprite[] Sprites;
}