c# - boolean 状态未能阻止功能重复

Question

由于某种原因无法追踪到这一点，它应该很简单，但我遗漏了一些东西。在 PreCountdownTimer() 中，我从 GameManager.cs 获取两个 bool 属性，将它们分配给 _userActive 和 _preCountdownActive 并且然后在 Update() 中查找更改。当 _userActive = false && _preCountdownActive = false 时，它启动 StartPreCountTimer() 并将 _preCountdownActive 设置为 true。

现在，一旦发生这种情况，Update() 将无法再根据要求调用 StartPreCountTimer()条件语句......但它仍然如此。这导致我的计时器在每一帧都被一遍又一遍地调用，从而阻止它倒计时。我在这里做错了什么阻止 _preCountdownActive boolean 停止 Update 触发 StartPreCountTimer()？

PreCountdownTimer.cs

using System.Collections;
using UnityEngine;

public class PreCountdownTimer : MonoBehaviour {

    public bool ShowRestartDialog { get; set; }
    private IEnumerator counter;
    private bool _startPrecount;
    private float _preCountdownInterval;
    private bool _preCountdownActive = false;
    private bool _userActive = false;
    private float _timerLength;

    void Start()
    {
        _timerLength = GameManager.Instance.PreCountdownLength;
    }

   void Update()
    {
        _userActive = GameManager.Instance.UserActive;

        if (!_userActive && !_preCountdownActive)
            StartPreCountTimer(_timerLength);
        else if (_userActive && _preCountdownActive)
            StopPreCountTimer();

        Debug.Log("The state of preCountdownActive is: " + _preCountdownActive);
    }

    void StartPreCountTimer(float length)
    {
        _preCountdownActive = true;
        counter = RunTimer(length);
        StartCoroutine(counter);   
    }

    void StopPreCountTimer()
    {
        _preCountdownActive = false;
        StopCoroutine(counter);
    }

    IEnumerator RunTimer(float seconds)
    {
        float s = seconds;
        while (s > 0)
        {
            yield return new WaitForSeconds(_preCountdownInterval);
            s -= _preCountdownInterval;
            Debug.Log("PreCount: " + s);
        }

        if (s == 0)
        {
            _preCountdownActive = false;
            ShowRestartDialog = true;
        }

    }
}

GameManager.cs

using UnityEngine;
using UnityEngine.SceneManagement;

public class GameManager : MonoBehaviour
{
    public static GameManager Instance = null; // create singleton

    public Object introScene;

    public bool UserActive { get; set; }
    public bool OnIntroScreen { get; set; }

    public GameObject preCountdownTimerPrefab;
    private GameObject _preCountdownTimerInstance;
    public float PreCountdownLength { get; protected set; }
    public float PreCountdownInterval { get; protected set; }

    private float _checkMousePositionTimingInterval = 1.0f;
    private Vector3 _currentMousePosition;
    private Vector3 _prevMousePosition;
    private Scene _currentScene;

    void Awake()
    {
        if (Instance == null)
            Instance = this;
        else if (Instance != null)
            Destroy(gameObject);

        DontDestroyOnLoad(gameObject);
    }

    void OnEnable()
    {
        SceneManager.sceneLoaded += OnSceneLoaded;
    }

    void OnSceneLoaded(Scene scene, LoadSceneMode mode)
    {
        _currentScene = scene;
    }

    void Start()
    {
        PreCountdownLength = 5.0f;
        PreCountdownInterval = 1.0f;

        OnIntroScreen = true;
        UserActive = false;

        _prevMousePosition = Input.mousePosition;

        InvokeRepeating("LastMousePosition", 0, _checkMousePositionTimingInterval); 
    }

    void Update()
    {
        _currentMousePosition = Input.mousePosition;

        if (_currentScene.name != introScene.name)
        {
            OnIntroScreen = false;
            if (_currentMousePosition != _prevMousePosition)
                UserActive = true;
            else
                UserActive = false;       
        }
        else if (_currentScene.name == introScene.name)
            OnIntroScreen = true;

        if (!UserActive && !OnIntroScreen)
            if (_preCountdownTimerInstance == null)
                _preCountdownTimerInstance = Instantiate(preCountdownTimerPrefab);
        else if (UserActive)
            if (_preCountdownTimerInstance != null)
                Destroy(_preCountdownTimerInstance);
    }

    void LastMousePosition()
    {
        _prevMousePosition = Input.mousePosition;
    }
}

Answer 1

我通过直接访问属性解决了这个问题，而不是将属性值保存到局部变量并访问局部变量。希望这是一种正确的方法？

using System.Collections;
using UnityEngine;

public class PreCountdownTimer : MonoBehaviour {

    private IEnumerator counter;

   void Update()
    {
        if (!GameManager.Instance.UserActive && !GameManager.Instance.PreCountdownActive)
            StartPreCountTimer(GameManager.Instance.PreCountdownLength);
        else if (GameManager.Instance.UserActive && GameManager.Instance.PreCountdownActive)
            StopPreCountTimer();
    }

    void StartPreCountTimer(float length)
    {
        GameManager.Instance.PreCountdownActive = true;
        counter = RunTimer(length);
        StartCoroutine(counter);   
    }

    void StopPreCountTimer()
    {
        GameManager.Instance.PreCountdownActive = false;
        StopCoroutine(counter);
    }

    IEnumerator RunTimer(float seconds)
    {
        float s = seconds;
        while (s > 0)
        {
            yield return new WaitForSeconds(GameManager.Instance.PreCountdownInterval);
            s -= GameManager.Instance.PreCountdownInterval;
            Debug.Log("PreCount: " + s);
        }

        if (s == 0)
        {
            GameManager.Instance.PreCountdownActive = false;
        }
    }
}