文本类型的 object 已被破坏，但您仍在尝试访问它 - Unity

Question

I have a game that has a main play scene and a game over scene. The Game over scene has a button that simply starts the main scene again.

Everything works fine for the first play, but when restarting through the game over screen and trying to add to my score I get the following error:

The object of type Text has been destroyed but you are still trying to access it.

I'm not sure why this is, I've tried logging out the referenced text object in the update and it looks fine.

I'm setting the highScore by dragging the text UI component to the script in the editor. I've also tried using GetComponent but run into the same issue.

Heres the relevant script:

public class ScoreHandler : MonoBehaviour
{
  public Text highScore;
  private int score = 0;

  private int basicEnemyValue = 10;
  private int speedyEnemnyValue = 15;
  private int bossEnemyValue = 50;
  private int startingHighScore;

  public static event Action<int> OnScoreChange;

  void OnEnable() {
    BasicEnemy.OnBasicEnemyDestroyed += BasicEnemyDestroyed;
    TankEnemy.OnTankEnemyDestroyed += TankEnemyDestroyed;
    SpeedyEnemy.OnSpeedyEnemyDestroyed += SpeedyEnemyDestroyed;
  }


  void onDisable() {
    BasicEnemy.OnBasicEnemyDestroyed -= BasicEnemyDestroyed;
    TankEnemy.OnTankEnemyDestroyed -= TankEnemyDestroyed;
    SpeedyEnemy.OnSpeedyEnemyDestroyed -= SpeedyEnemyDestroyed;
  }

  void Start () {
    startingHighScore = PlayerPrefs.GetInt ("highscore", 0);
    highScore.text = "Score: " + score;
  }


  void Update () {
    Debug.Log(highScore); // Looks good here, has a ref to the correct component UnityEngine.Ui.Text
    Debug.Log(highScore.text); // Same as above - has what's set in start
  }

  private void checkHighScore(int score) {
    if (score > startingHighScore) {
      PlayerPrefs.SetInt ("highscore", score);
    }
  }

 // ***HERE IS THE PROBLEM FUNCTION***
  private void updateScoreText() {
    Debug.Log(highScore); // null


    highScore.text = "Score: " + score;
    checkHighScore(score);
    OnScoreChange?.Invoke(score);
  }

  private void BasicEnemyDestroyed() {
    score += basicEnemyValue;
    updateScoreText();
  }

  private void TankEnemyDestroyed() {
    score += bossEnemyValue;
    updateScoreText();
  }

  private void SpeedyEnemyDestroyed() {
    score += speedyEnemnyValue;
    updateScoreText();
  }

}

I'm a bit confused as everything looks fine in the update, but seems to loose the component when I call the function on it. I've tried to add dontDestoryOnLoad() to the UI, but that adds a number of other issues with other UI components not being defined.

Answer 1

onDisable -> OnDisable

It's case-sensitve, so your event handlers are never removed.

---

FYI there is a shortcut to insert these messages in Visual Studio: Ctrl Shift M