LoadSceneAsync: code after the scene is done loading isn't called

Unity Engine
1

Hello,

I’m using LoadSceneAsync to create a loading screen and I’m wondering why the code snippet after the while loop isn’t called:

    public IEnumerator SwitchScene(int newSceneIndex)
    {
        previousScene = SceneManager.GetActiveScene();  
        AsyncOperation sceneLoading = SceneManager.LoadSceneAsync(newSceneIndex);
        loadingScreen.gameObject.SetActive(true);
        while (!sceneLoading.isDone)
        {
            loadingScreen.SetLoadingBarValue(Mathf.Clamp01(sceneLoading.progress / .9f));
            yield return null;
        }
// NOTHING OF THIS IS CALLED
        loadingScreen.gameObject.SetActive(false);
        Debug.Log("scene loading done");
        currentScene = SceneManager.GetActiveScene();
    }

I’ve first thought that my SceneController script wasn’t persisted between scenes so the coroutine was stopped, but I’m using a Singleton with a DontDestroyOnLoad, so it should still exists right?

    #region Singleton
    static SceneController instance;
    public static SceneController Instance {
        get { return instance; }
    }
    #endregion

void Awake()
    {
        #region Singleton
        if (instance != null && instance != this)
        {
            Destroy(this.gameObject);
        } else {
            instance = this;
            DontDestroyOnLoad(this);
        }
        #endregion
    }

Any help?
Thank you for your time!

Kind regards

2

I’m not sure about that singleton implementation… Does it still exist in the scene? I mean it’s trivial to look!

Some super-simple Singleton examples to take and modify:

Simple Unity3D Singleton (no predefined data):

https://pastebin.com/SuvBWCpJ

Unity3D Singleton with a Prefab (or a ScriptableObject) used for predefined data:

https://pastebin.com/cv1vtS6G

These are pure-code solutions, do not put anything into any scene, just access it via .Instance!

If it is a GameManager, when the game is over, make a function in that singleton that Destroys itself so the next time you access it you get a fresh one, something like:

public void DestroyThyself()
{
   Destroy(gameObject);
   Instance = null;    // because destroy doesn't happen until end of frame
}

Either way, put in lots of Debug.Log() statements as well as some in OnDisable() in your singleton above to make sure it isn’t going away.

3

Thank you for your answer.

The SceneController (this object) is indeed still existing in my newly loaded scene.
I tried using a Debug.Log in OnDisable(), but it isn’t called (except when I stop the game of course).

EDIT: I found the issue, I was actually starting the Coroutine SwitchScene from an object which wasn’t persisted through scene changes.
Thanks for the help!

4

Are you sure it’s the same one and not a fresh one?

Before changing the scene, rename the existing one, see if it’s really the same one next scene.