Unity C# 记住 WaitForSeconds Yield 之前的变量

Question

我正在尝试在 Portal 位置所在的位置生成一个平台，所以它看起来像是从 Portal 出来的。

我在使用这一行时遇到问题：Vector3 PlatformPosition = m_PortalPosition;，因为 SpawnPortal 等待 1 秒然后调用生成平台方法，m_PortalPosition 被覆盖了开始分配 PlatformPosition。在调用 WaitForSeconds(1f); 之前，如何 'remember' m_PortalPosition 的变量？

void Awake()
{       
        for (int i = 0; i < 10; i++)
        {
            StartCoroutine(SpawnPortal());
        }
}

private IEnumerator SpawnPortal()
{
    // Do portal stuff
    // Get an Platform from the object pool.
    GameObject PortalGameObject = m_PortalObjectPool.GetGameObjectFromPool();

    // Generate a position at a distance forward from the camera within a random sphere and put the Platform at that position.
    m_PortalPosition = m_Cam.position + Vector3.forward * m_SpawnZoneDistance + new Vector3(UnityEngine.Random.insideUnitSphere.x * m_PlatFormZoneRadius.x, UnityEngine.Random.insideUnitSphere.y * m_PlatFormZoneRadius.y, UnityEngine.Random.insideUnitSphere.z * m_PlatFormZoneRadius.z);

    PortalGameObject.transform.position = m_PortalPosition;

    yield return new WaitForSeconds(1f);
    SpawnPlatform();
}

private void SpawnPlatform()
{
    // Get an Platform from the object pool.
    GameObject PlatformGameObject = m_PlatformObjectPool.GetGameObjectFromPool();

    //Set the platform position to the portal position, problem with this line
    Vector3 PlatformPosition = m_PortalPosition;

    PlatformGameObject.transform.position = PlatformPosition;

    // Get the Platform component and add it to the collection.
    Platform Platform = PlatformGameObject.GetComponent<Platform>();
    m_platforms.Add(Platform);

    // Subscribe to the Platforms events.
    Platform.OnPlatformRemovalDistance += HandlePlatformRemoval;
    m_lowestPlatformPositionY = m_platforms.Min(x => x.transform.position.y);
}

Answer 1

您需要使用局部变量而不是 class 字段。

这样，每次调用函数都会有自己的独立变量。

Answer 2

使 m_PortalPosition 成为 SpawnPortal 协程中的局部变量，而不是使其成为 class 变量。每次调用它时将它作为参数传递给 SpawnPlatform 并使用传递的参数代替。您的代码将更改为：

private IEnumerator SpawnPortal()
{
    //...
    // Note the local variable?
    Vector3 m_PortalPosition = //...

    PortalGameObject.transform.position = m_PortalPosition;

    yield return new WaitForSeconds(1f);
    SpawnPlatform(m_PortalPosition);
}

private void SpawnPlatform(Vector3 PlatformPosition)
{
    //...
    // Commented out, not needed as we are using the argument
    //Vector3 PlatformPosition = m_PortalPosition;

    PlatformGameObject.transform.position = PlatformPosition;

    //...
}

Unity C# 记住 WaitForSeconds Yield 之前的变量

Unity C# Remember variables from before WaitForSeconds Yield

c#

yield

coroutine

unity3d