SceneManager.loadedSceneCount

説明

読み込まれているシーン数

Returns the current number of loaded Scenes. This doesn't include the Scenes that are currently loading or unloading. For the total number of Scenes see SceneManager.sceneCount.

using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEditor;

public class Example
{
    // adds a custom menu item which displays the number of open Scenes in a Dialogue Box
    [MenuItem("SceneExample/Number Of Scenes")]
    public static void NumberOfScenes()
    {
        EditorUtility.DisplayDialog("Number of loaded Scenes:", SceneManager.loadedSceneCount.ToString(), "Ok");
    }
}