unity 动态改变 初始化默认 场景 加载序列

官方代码：Unity - 脚本 API：编辑器构建设置。. (unity3d.com)

using System.Collections.Generic;
using UnityEditor;
using UnityEngine;
 
public class ExampleWindow : EditorWindow
{
    List<SceneAsset> m_SceneAssets = new List<SceneAsset>();
 
    // Add menu item named "Example Window" to the Window menu
    [MenuItem("Window/Example Window")]
    public static void ShowWindow()
    {
        //Show existing window instance. If one doesn't exist, make one.
        EditorWindow.GetWindow(typeof(ExampleWindow));
    }
 
    void OnGUI()
    {
        GUILayout.Label("Scenes to include in build:", EditorStyles.boldLabel);
        for (int i = 0; i < m_SceneAssets.Count; ++i)
        {
            m_SceneAssets[i] = (SceneAsset)EditorGUILayout.ObjectField(m_SceneAssets[i], typeof(SceneAsset), false);
        }
        if (GUILayout.Button("Add"))
        {
            m_SceneAssets.Add(null);
        }
 
        GUILayout.Space(8);
 
        if (GUILayout.Button("Apply To Build Settings"))
        {
            SetEditorBuildSettingsScenes();
        }
    }
 
    public void SetEditorBuildSettingsScenes()
    {
        // Find valid Scene paths and make a list of EditorBuildSettingsScene
        List<EditorBuildSettingsScene> editorBuildSettingsScenes = new List<EditorBuildSettingsScene>();
        foreach (var sceneAsset in m_SceneAssets)
        {
            string scenePath = AssetDatabase.GetAssetPath(sceneAsset);
            if (!string.IsNullOrEmpty(scenePath))
                editorBuildSettingsScenes.Add(new EditorBuildSettingsScene(scenePath, true));
        }
 
        // Set the Build Settings window Scene list
        EditorBuildSettings.scenes = editorBuildSettingsScenes.ToArray();
    }
}