每次发生碰撞时如何继续协程功能？

Question

我正在制作游戏中的健康栏。当我的玩家被子弹击中时，它的生命减少了 1 并且我开始了一个协程，在该协程中我设置了健康栏的可见性打开/关闭。 但我想要的是当玩家不断被子弹击中时，健康栏不应该被禁用。它应该开启。 到目前为止，我所做的是：

IEnumerator EnableAndDisableHealthBar()
{
    isHealthBarVisible = true;
    showIsHealthBarVisible = true;

    fillAmt -= 0.05f;

    if (fillAmt >= 0.6f && fillAmt <= 1.0f)
    {
        HealthBarFiller.color = Color.green;
    }
    else if (fillAmt >= 0.3f && fillAmt < 0.6f)
    {
        HealthBarFiller.color = Color.yellow;
    }
    else if (fillAmt < 0.3f)
    {
        HealthBarFiller.color = Color.red;
    }

    yield return new WaitForSeconds(healthBarVisibilityTime);

    showIsHealthBarVisible = false;
    isHealthBarVisible = false;
}

public void OnTriggerEnter(Collider obj)
{
    if (obj.tag == "EnemyBullets")
    {
        Debug.Log("Player Plane hit by Enemy Bullet");

        planeCurrentLife--;

        if (planeCurrentLife >= 1 && planeCurrentLife < 20)
        {
            StartCoroutine(EnableAndDisableHealthBar());
        }
        else if (planeCurrentLife <= 0)
        {
            Destroy(obj.gameObject);
            StartCoroutine(EnableAndDisableHealthBar());
            Explode();
        }
    }
}

我想在子弹连续击中玩家时暂停我的协程功能，以便我的生命条在整个时间段内都可见，它只是显示减少的生命。

Answer 1

我更新了您的代码，以便将 EnableAndDisableHealthBar() 函数存储为全局字段，然后在 OnTriggerEnter() 函数中再次调用它时停止（在它完成并禁用健康栏之前）。我在我添加的代码上方添加了 cmets。

// Store the Coroutine as a global field
Coroutine enableDisableHealthBarCoroutine;

IEnumerator EnableAndDisableHealthBar()
{
    isHealthBarVisible = true;
    showIsHealthBarVisible = true;

    fillAmt -= 0.05f;

    if (fillAmt >= 0.6f && fillAmt <= 1.0f)
    {
        HealthBarFiller.color = Color.green;
    }
    else if (fillAmt >= 0.3f && fillAmt < 0.6f)
    {
        HealthBarFiller.color = Color.yellow;
    }
    else if (fillAmt < 0.3f)
    {
        HealthBarFiller.color = Color.red;
    }
    yield return new WaitForSeconds(healthBarVisibilityTime);

    showIsHealthBarVisible = false;
    isHealthBarVisible = false;
}

public void OnTriggerEnter(Collider obj)
{
    if (obj.tag == "EnemyBullets")
    {
        Debug.Log("Player Plane hit by Enemy Bullet");

        planeCurrentLife--;

        // Check if there was a previous coroutine running
        if(enableDisableHealthBarCoroutine != null) 
        {
            // If there was, then stop it
            // (this will leave the health bar enabled)
            enableDisableHealthBarCoroutine.StopCoroutine();
        }

        if (planeCurrentLife >= 1 && planeCurrentLife < 20)
        {
            // Set the current coroutine to the new instance we're creating here
            // This will keep the health bar enabled for another "healthBarVisibilityTime" seconds
            enableDisableHealthBarCoroutine = StartCoroutine(EnableAndDisableHealthBar());
        }
        else if (planeCurrentLife <= 0)
        {
            Destroy(obj.gameObject);
            // Set the current coroutine to the new instance we're creating here
            // This will keep the health bar enabled for another "healthBarVisibilityTime" seconds
            enableDisableHealthBarCoroutine = StartCoroutine(EnableAndDisableHealthBar());
            Explode();
        }
    }
}

这是因为StartCoroutine() 函数返回一个Coroutine 对象，您可以使用StopCoroutine() 阻止它运行。还有其他方法可以停止协程，例如调用StopAllCoroutines()，但存储对协程的引用通常是管理协程并且不引入错误的最安全方法。有关协程的更多信息，请查看文档here

下面的代码与我在此过程中看到的其他代码相同。我想展示两个版本，但它们应该做同样的事情。

// Store the Coroutine as a global field
Coroutine enableDisableHealthBarCoroutine;

IEnumerator EnableAndDisableHealthBar() {
    // could combine isHealthBarVisible and showIsHealthBarVisible as seen here, but I don't know what else they're doing in your code
    isHealthBarVisible = true;
    showIsHealthBarVisible = true;    

    fillAmt -= 0.05f;

    if (fillAmt >= 0.6f) { // it shouldn't matter if fillAmt is > 1
        HealthBarFiller.color = Color.green;
    }
    else if (fillAmt >= 0.3f) { // guaranteed that fillAmt < .6 because of the previous if statement
        HealthBarFiller.color = Color.yellow;
    }
    else { // guaranteed that fillAmt < .3 because of the previous if statements
        HealthBarFiller.color = Color.red;
    }

    yield return new WaitForSeconds(healthBarVisibilityTime);

    showIsHealthBarVisible = false;
    isHealthBarVisible = false;
}

public void OnTriggerEnter(Collider obj)
{
    if (obj.tag == "EnemyBullets") {
        Debug.Log("Player Plane hit by Enemy Bullet");

        planeCurrentLife--;

        // Check if there was a previous coroutine running
        if(enableDisableHealthBarCoroutine != null) {
            // If there was, then stop it
            // (this will leave the health bar enabled)
            enableDisableHealthBarCoroutine.StopCoroutine();
        }

        // Set the current coroutine to the new instance we're creating here
        // This will keep the health bar enabled for another "healthBarVisibilityTime" seconds
        enableDisableHealthBarCoroutine = StartCoroutine(EnableAndDisableHealthBar());

        if (planeCurrentLife <= 0) {
            Destroy(obj.gameObject);
            Explode();
        }
    }
}