Help with CustomPropertyDrawer for 2D Array.

Unity Engine
1

Hi, I am using CustomPropertyDrawer to create 2D Array I can manipulate in the inspector, but I keep getting this error (sorry in advance for the length of the error.

Editor Script.

using UnityEngine;
using UnityEditor;

[CustomPropertyDrawer(typeof(CustomUnitType))]
public class CustomTileData : PropertyDrawer
{
    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
    {
        EditorGUI.PrefixLabel(position, label);

        Rect newPosition = position;
        newPosition.y += 20f;
        SerializedProperty rows = property.FindPropertyRelative("rows");

        int LengthOfArray = 7;

        for (int i = 0; i < 8; i++)
        {
            SerializedProperty row = rows.GetArrayElementAtIndex(i).FindPropertyRelative("row");
            newPosition.height = 20;

            if (row.arraySize != LengthOfArray)
            {
                row.arraySize = LengthOfArray;
            }

            newPosition.width = 20;

            for (int j = 0; j < LengthOfArray; j++)
            {
                //Debug.Log("ED: j " + j);
                EditorGUI.PropertyField(newPosition, row.GetArrayElementAtIndex(j), GUIContent.none);
                newPosition.x += newPosition.width;
            }

            newPosition.x = position.x;
            newPosition.y += 20;
        }
    }

    public override float GetPropertyHeight(SerializedProperty property, GUIContent label)
    {
        return 20 * 9;
    }
}

Type, above script is referencing.

using UnityEngine;
using System.Collections;

[System.Serializable]
public class CustomUnitType
{
    [System.Serializable]
    public struct rowData
    {
        public int[] row;
    }

    public rowData[] rows = new rowData[7];
}
2

Your for loop is doing 8 iterations while the rows array length is only 7. The rows.GetArrayElementAtIndex(i) will return null for the out of bounds element.