在统一C＃中等待航路点的时间量

Question

我在 Unity 2D 项目中有一个航点系统，其中游戏对象将按顺序跟随每个航点，然后重复该过程，我希望游戏对象在每个点停止一段固定的时间，我认为我可以实现这使用协程但不完全确定如何实现这一点，到目前为止我所做的是创建一个名为 WaitAtPoint 的协程，然后在每个航路点移动时调用它但无济于事，不确定我做错了什么。

public class BrainBoss : MonoBehaviour {
[SerializeField]
Transform[] waypoints;

[SerializeField]
float moveSpeed = 2f;

int waypointIndex = 0;


// Start is called before the first frame update
void Start()
{
    transform.position = waypoints[waypointIndex].transform.position;
}

// Update is called once per frame
void Update()
{
    Move();
}

void Move()
{
    transform.position = Vector2.MoveTowards(transform.position, 
        waypoints[waypointIndex].transform.position, moveSpeed * Time.deltaTime);

    if(transform.position == waypoints[waypointIndex].transform.position)
    {
        StartCoroutine(WaitAtPoint());
        waypointIndex += 1;
    }

    if(waypointIndex == waypoints.Length)
    {
        waypointIndex = 1;
    }
}

IEnumerator WaitAtPoint()
{
    yield return new WaitForSeconds(3f);
}

}

Answer 1

您在每次更新时都调用 Move，并且您也可能多次调用 StartCoroutine，所以我建议使用变量来查看是否应该更新运动

public class BrainBoss : MonoBehaviour
{
[SerializeField]
Transform[] waypoints;

[SerializeField]
float moveSpeed = 2f;

int waypointIndex = 0;
private bool shouldMove = true;


// Start is called before the first frame update
void Start() {
    transform.position = waypoints[waypointIndex].transform.position;
}

// Update is called once per frame
void Update() {
    if (this.shouldMove) {
        Move();
    }
}

void Move() {
    transform.position = Vector2.MoveTowards(transform.position,
        waypoints[waypointIndex].transform.position, moveSpeed * Time.deltaTime);

    if (transform.position == waypoints[waypointIndex].transform.position) {
        StartCoroutine(WaitAtPoint(3));
        waypointIndex += 1;
    }

    if (waypointIndex == waypoints.Length) {
        waypointIndex = 1;
    }
}

IEnumerator WaitAtPoint(int seconds) {
    this.shouldMove = false;
    int counter = seconds;
    while (counter > 0) {
        yield return new WaitForSeconds(1);
        counter--;
    }

    this.shouldMove = true;
}

}

Answer 2

您可以使用一个简单的布尔标志来知道您是否应该移动。在移动（或更新）中，检查该布尔值以了解您是否应该移动。

在 WaitAtPoint 中，将 bool（如 shouldWait）设置为 true，然后在 WaitForSecond 之后返回 false！

Answer 3

嗯，您的 WaitAtPoint 目前并没有做很多事情。这是因为它在 IEnumerator 内部等待，而不是在您调用它的位置。

有多种方法可以解决这个问题，但我建议在等待时间后执行的 IEnumerator 上使用 callback。

像这样：

private bool isWaiting;

void Update() {
    if (!isWaiting) {
        Move();
    }
}

void Move()
{
    transform.position = Vector2.MoveTowards(transform.position, 
        waypoints[waypointIndex].transform.position, moveSpeed * Time.deltaTime);

    if(transform.position == waypoints[waypointIndex].transform.position)
    {
        StartCoroutine(WaitAtPoint(() => 
        {
            // All code that should be executed after waiting here.
            waypointIndex += 1;
        }));

    }

    if(waypointIndex == waypoints.Length)
    {
        waypointIndex = 1;
    }
}

IEnumerator WaitAtPoint(Action callback)
{
    isWaiting = true;
    yield return new WaitForSeconds(3f);
    callback.Invoke();
    isWaiting = false;
}