BackingFieldNameAttribute.cs

using System;
#if UNITY_EDITOR
using UnityEditor;
using UnityEngine;
#endif

namespace JamesFrowen.PositionSync
{
    [AttributeUsage(AttributeTargets.Field, AllowMultiple = false)]
    public class BackingFieldNameAttribute : PropertyAttribute
    {
        public string ReplacementName { get; set; }
    }

    [CustomPropertyDrawer(typeof(BackingFieldNameAttribute), true)]
    public class BackingFieldNameDrawer : PropertyDrawer
    {
        const string backingPrefix = "<";
        const string backingSufix = ">k__Backing Field";

        public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
        {
            EditorGUI.BeginProperty(position, label, property);

            var attr = this.attribute as BackingFieldNameAttribute;
            if (!string.IsNullOrEmpty(attr.ReplacementName))
            {
                label.text = attr.ReplacementName;
            }
            else
            {
                var text = label.text;
                var replaced = text.Replace(backingPrefix, "").Replace(backingSufix, "");
                label.text = replaced;
            }

            EditorGUI.PropertyField(position, property, label, true);

            EditorGUI.EndProperty();
        }
    }
}