自定义编辑器。值未保存 SerializedProperty.enumValueIndex

Question

一天中的好时光。 我不参与编辑器的定制，但我决定看看一些东西以及如何，同时组织我的检查器。 面对获取私有字段并不是那么容易的问题。我通过反思阅读了应该做的事情。 最后，一切似乎都很好，直到我遇到了一个问题： 由于某种原因，该值未保存...这是代码：

using UnityEditor;
using UnityEditor.SceneManagement;
using UnityEngine;
 
[CustomEditor(typeof(Door))]
public class DoorEditor : Editor
{
    private Door _target;
    private SerializedObject _serializedObject;
 
    private SerializedProperty 
        _state,
        _startPoint;
 
    private void OnEnable() {
        _target = (Door)target;
        _serializedObject = new SerializedObject(_target);
 
        _startPoint = _serializedObject.FindProperty("_startPoint");
        _state = serializedObject.FindProperty("_state");
    }
 
    public override void OnInspectorGUI() {
        EditorGUILayout.BeginVertical("box");
 
        _startPoint.objectReferenceValue = (Transform)EditorGUILayout.ObjectField("Start Point", _startPoint.objectReferenceValue, typeof(Transform), true);
 
        _state.enumValueIndex = (int)(DoorState)EditorGUILayout.EnumPopup((DoorState)_state.enumValueIndex);
        //Actually the line above does not work. and to be more precise, even "_state.enumValueIndex = 1" does not change the value _state.enumValueIndex, why?...
 
        EditorGUILayout.EndVertical();
        EndOnInspectorGUI();
    }
 
    private void EndOnInspectorGUI() {
        if (_serializedObject != null)
            _serializedObject.ApplyModifiedProperties();
 
        if (GUI.changed) SetObjectDirty(_target.gameObject);
    }
 
    public static void SetObjectDirty(GameObject obj) {
        EditorUtility.SetDirty(obj);
        EditorSceneManager.MarkSceneDirty(obj.scene);
    }
}

编写编辑器的类：

public class Door : MonoBehaviour, IInteract
{
    [SerializeField] private Transform _startPoint; public Transform StartPoint => _startPoint;
    [SerializeField] private DoorState _state = DoorState.Open; public DoorState State => _state;
    [SerializeField] private DoorType _type = DoorType.Standart;
    [SerializeField, TextArea(1, 3)] private string _massage = "Error! Сообщение не назначено";
    [SerializeField] private AudioSource _audioSource;
    [SerializeField] private DoorOpeningSounds _doorOpeningSounds;
    public UnityEvent OnOpenDoor; 
    public UnityEvent OnEnterTheDoor;
 
 
    public void SetMassage(string newMassage) {
        _massage = newMassage;
    }
    public void SetState(DoorState newState) {
        _state = newState;
    }
 
    public void OpenTheDoor() {
        _audioSource.clip = _doorOpeningSounds.GetClip(_type);
        _audioSource.Play();
        OnOpenDoor.Invoke();
    }
 
    private void EnterTheDoor() {
        OpenTheDoor();
        OnEnterTheDoor.Invoke();
    }
 
    public void Interact() {
        if (_state == DoorState.Open) {
            EnterTheDoor();
        } else if (_state == DoorState.Loced) {
            SubtitlesManager.Instance.ShowSubtitles(new Subtitle("Закрыто", 2f), true);
        } else if (_state == DoorState.Broken) {
            SubtitlesManager.Instance.ShowSubtitles(new Subtitle("Ручка сломана", 2f), true);
        } else if (_state == DoorState.Bloked) {
            SubtitlesManager.Instance.ShowSubtitles(new Subtitle("Дверь что-то блокирует", 2f), true);
        } else if (_state == DoorState.NoActive) {
            SubtitlesManager.Instance.ShowSubtitles(new Subtitle("Не поддаётся", 2f), true);
        } else if (_state == DoorState.Massage) {
            SubtitlesManager.Instance.ShowSubtitles(new Subtitle(_massage, 2f), true);
        } else {
            Debug.LogError("Действие двери в состоянии " + _state + " не реализовано");
        }
    }
}

枚举是最常见的：

public enum DoorState
{
    Open,
    Loced,
    Broken,
    Bloked,
    NoActive,
    Massage
}

不是我不会设置值，我已经试过很多方法了。事实上，设置值会在 OnInspectorGUI 的下一次迭代中重置。 如果我安装它并在一次迭代中进行检查和操作，一切都会正常，但是一旦下一次迭代开始，该值将立即重置。 不知何故，设置值后，我不保存它，但一般保存发生在 EndOnInspectorGUI() 的每次迭代结束时； 这是一个无法设置值的视频：https://youtu.be/PZm9jiLxTM4

我在检查器中尝试了各种显示选项。但问题是 _state.enumValueIndex 在赋值时不保存值