调用 OnTriggerStay() 时检查按键

Question

我有一个 NPC，当玩家对撞机与 NPC 发生碰撞时，我的玩家可以与之交谈，我使用这段代码来做到这一点：

private void OnTriggerStay2D(Collider2D other)
{
    if (other.gameObject.tag == "InteractiveArea")
    {
        if (Input.GetKeyDown(KeyCode.E))
        {
            Debug.Log("PRESSED NPC");
            CreateAndShowDialog();
        }
    }
}

然而，这确实是随机调用的，有时我第一次按 "E"，有时第二次或第三次，依此类推。

我的刚体：

我使用的碰撞器是标准的 BoxCollider2D，我的玩家碰撞器是触发器，NPC 不是。

为什么在 OnTriggerStay 函数中没有检测到某些按键？

Answer 1

OnTriggerStay2D 被随机调用。这就是为什么你不应该检查其中的输入。

在 OnTriggerEnter2D 和 OnTriggerExit2D 函数中将标志设置为 true 和 false 然后检查该标志并在 Update 函数中输入这被称为每一帧。此外，始终使用 CompareTag 而不是 other.gameObject.tag 来比较标签。

private void Update()
{
    if (Input.GetKeyDown(KeyCode.E) && triggerStay)
    {
        //
    }
}

bool triggerStay = false;

void OnTriggerEnter2D(Collider2D collision)
{
    Debug.Log("Entered");
    if (collision.gameObject.CompareTag("InteractiveArea"))
    {
        triggerStay = true;
    }
}

void OnTriggerExit2D(Collider2D collision)
{
    Debug.Log("Exited");
    if (collision.gameObject.CompareTag("InteractiveArea"))
    {
        triggerStay = false;
    }
}

Answer 2

我的猜测是因为 Input.GetKeyDown is only true for the single (Update()) frame that the key was pressed 返回的值，而物理（包括 OnTriggerStay）是在 physics 帧期间调用的，即 FixedUpdate()

我做了一些研究 this question，这表明：

I've been struggling with this issue all afternoon!

My OnTriggerStay and Update/FixedUpdate methods were not in sync resulting is split-second undesired effects.

I finally found the solution when I read in the OnTriggerStay docs that this function can be a co-routine. I simply added a WaitForFixedUpdate in the correct location in my OnTriggerStay and it worked. They now both run in sync with each other. This even corrects the issue in Update.

Another question 将此作为解决方案（程序员的回答）：

OnTriggerStay will not call on every frame. One way to get around this is to have OnTriggerEnter, and OnTriggerExit set a bool. Then execute your code in the FixedUpdate().

虽然文档不再说明 this post 所说的内容，

OnTriggerStay gets called every FixedUpdate.

"Note: OnTriggerStay function is on the physics timer so it wont necessary run every frame. "

这证实了我的猜测，文档已更改为不再包含此注释，原因不明。

Answer 3

你可以这样做：

bool eIsOnclick;


 float wait = 0.03f;
    float nextFire = 0.0f;
void Update() {
   if(Input.GetKeyDown(keyKode.E))
      eIsOnclick = true;

else if(nextFire < Time.time)
    nextFire = Time.time + wait;
    ebas = false;

}
void OnTriggerStay2D(Collider2D collision) {
   if(eIsOnclick == true) {
// your cods
}

// 总是不工作的问题

调用 OnTriggerStay() 时检查按键

Check key press when OnTriggerStay() is called

c#

unity3d

unity5