Unity如何为场景切换脚本制作Inspector下拉选择器？

方法1：使用SceneAsset直接引用（推荐） #

这种方式支持在Inspector里直接拖拽或下拉选择场景，避免手动输入字符串出错，同时通过条件编译处理编辑器与运行时的差异，打包时不会产生冗余代码。

修改后的完整代码：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
#if UNITY_EDITOR
using UnityEditor;
#endif

public class LevelSwap : MonoBehaviour
{
    #if UNITY_EDITOR
    [SerializeField] private SceneAsset targetScene;
    #endif
    [SerializeField] private string levelToLoad = "Stage2";

    private void OnValidate()
    {
        #if UNITY_EDITOR
        // 编辑器内自动同步SceneAsset引用到场景名字符串
        if (targetScene != null)
        {
            levelToLoad = targetScene.name;
        }
        #endif
    }

    private void OnTriggerEnter(Collider other)
    {
        if (other.CompareTag("Player") && !string.IsNullOrEmpty(levelToLoad))
        {
            SceneManager.LoadScene(levelToLoad);
        }
    }
}

方法2：自定义属性实现场景下拉菜单 #

如果偏好直接对字符串字段做下拉扩展，可以通过自定义属性绘制器实现：

1. 创建自定义属性类 #

using UnityEngine;
#if UNITY_EDITOR
using UnityEditor;
#endif

public class SceneDropdownAttribute : PropertyAttribute { }

#if UNITY_EDITOR
[CustomPropertyDrawer(typeof(SceneDropdownAttribute))]
public class SceneDropdownDrawer : PropertyDrawer
{
    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
    {
        if (property.propertyType != SerializedPropertyType.String)
        {
            EditorGUI.HelpBox(position, "SceneDropdown仅支持字符串类型字段", MessageType.Error);
            return;
        }

        // 获取Build Settings中已添加的所有场景
        var buildScenes = EditorBuildSettings.scenes;
        string[] sceneNames = new string[buildScenes.Length];
        int selectedIndex = 0;

        for (int i = 0; i < buildScenes.Length; i++)
        {
            sceneNames[i] = System.IO.Path.GetFileNameWithoutExtension(buildScenes[i].path);
            if (sceneNames[i] == property.stringValue)
            {
                selectedIndex = i;
            }
        }

        // 绘制下拉选择菜单
        selectedIndex = EditorGUI.Popup(position, label, selectedIndex, sceneNames);
        property.stringValue = sceneNames[selectedIndex];
    }
}
#endif

2. 修改LevelSwap脚本 #

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;

public class LevelSwap : MonoBehaviour
{
    [SceneDropdown]
    public string levelToLoad = "Stage2";

    private void OnTriggerEnter(Collider other)
    {
        if (other.CompareTag("Player"))
        {
            SceneManager.LoadScene(levelToLoad);
        }
    }
}

关键注意事项 #

• 无论使用哪种方法，需要加载的场景必须添加到Build Settings的「Scenes In Build」列表中，否则下拉菜单不会显示该场景，运行时也无法正常加载。

内容的提问来源于stack exchange，提问作者Daniel Budgieton