当属性是列表时，如何在PropertyDrawer上实现ReorderableList

using UnityEditor;
using UnityEditorInternal;
using UnityEngine;

[CustomEditor(typeof(YourScript))]
public class YourScriptEditor : Editor
{
    private ReorderableList list;

    private void OnEnable()
    {
        list = new ReorderableList(serializedObject, serializedObject.FindProperty("yourListProperty"), true, true, true, true);

        list.drawHeaderCallback = rect =>
        {
            EditorGUI.LabelField(rect, "Your List Property");
        };

        list.drawElementCallback = (rect, index, isActive, isFocused) =>
        {
            var element = list.serializedProperty.GetArrayElementAtIndex(index);
            rect.y += 2;

            EditorGUI.PropertyField(new Rect(rect.x, rect.y, rect.width, EditorGUIUtility.singleLineHeight), element, GUIContent.none);
        };

        list.onAddCallback = list =>
        {
            var index = list.serializedProperty.arraySize;
            list.serializedProperty.arraySize++;
            list.index = index;

            var element = list.serializedProperty.GetArrayElementAtIndex(index);
            element.objectReferenceValue = null;
        };
    }

    public override void OnInspectorGUI()
    {
        serializedObject.Update();

        list.DoLayoutList();

        serializedObject.ApplyModifiedProperties();
    }
}