SerializedObject.Update

描述

更新序列化对象的表示。

当构建 SerializedObject 时，目标对象会被序列化，并且 SerializeObject 和 SerializedProperty API 提供对该序列化表示的读写访问。如果一个或多个目标对象通过另一个 SerializedObject 实例或直接写入目标对象而发生更改，则 SerializedObject 内部序列化表示可能会不同步。调用 Update() 将重新序列化目标对象，以便 SerializedObject 反映其最新状态。

调用 Update() 将丢弃尚未应用的任何本地修改的属性。

其他资源：SerializedObject.hasModifiedProperties，SerializedObject.ApplyModifiedProperties

using System;
using System.Text;
using UnityEngine;
using UnityEditor;

public class SerializeObjectUpdate : ScriptableObject
{
    public int m_Field = 1;

    [MenuItem("Example/SerializedObject Update")]
    static void UpdateExample()
    {
        var scriptableObject = ScriptableObject.CreateInstance<SerializeObjectUpdate>();
        var sb = new StringBuilder();

        using (var serializedObject = new SerializedObject(scriptableObject))
        {
            SerializedProperty field = serializedObject.FindProperty("m_Field");

            // Change underlying object
            scriptableObject.m_Field = 2;

            // SerializedObject still thinks value is 1
            sb.Append($"SerializedObject value before Update: {field.intValue} ");

            //hasModifiedProperties returns false because no changes have been made via SerializedProperty API
            sb.Append($"(SerializedObject dirty: {serializedObject.hasModifiedProperties}), ");

            // Update so that SerializedObject sees the new value
            serializedObject.Update();
            sb.AppendLine($"after Update: {field.intValue}");

            // Another scenario is when Update is called while there are pending changes in the SerializedObject
            field.intValue = 3;
            sb.Append($"SerializedObject value before Update: {field.intValue} ");
            sb.Append($"(SerializedObject dirty: {serializedObject.hasModifiedProperties}), ");

            // Value reverts back to 2, because ApplyModifiedProperties was not called
            // and SerializedObject has been put back in sync with the object's state
            serializedObject.Update();
            sb.AppendLine($"after Update: {field.intValue}. (Dirty: {serializedObject.hasModifiedProperties})");

            Debug.Log(sb.ToString());
        }
    }
}