Unity：协程中的无限 While 循环

Question

好的，我正在尝试为我的 2d 角色创建一个小的破折号协程。当协程调用时，重力会关闭，他会在一段时间内在 2 种速度之间徘徊。问题出在我的 Dash 协程中，while 循环检查 time.time(current time) > start time + dash duration。

在使用 Mono 进行调试时，我发现我的变量 currentTime 在设置后并没有改变，即使我可以清楚地看到 while 循环多次运行。这让我陷入了无限循环。

有什么建议吗？

    void Update () {
    MoveAndJump ();
    CheckDash ();
    }




void MoveAndJump(){

    if(dashing){
        return;
    }

    Vector2 moveDir = new Vector2 (Input.GetAxisRaw ("Horizontal") * moveSpeed, rb.velocity.y);
    rb.velocity = moveDir;

    // Consider Switching to an overlap circle based on the actual character graphic. This currently uses a rectangle
    // This can also use 4 points to create a more complex box shape. This only works well when using at least about 1 unit size. any smaller and it is innacurate
    isGrounded = Physics2D.OverlapArea (groundPoint_right.position, groundPoint_left.position, groundMask);
    Debug.Log (isGrounded);

    if (Input.GetAxisRaw ("Horizontal") == 1) {
        transform.localScale = new Vector3 (1 , 1 * transform.localScale.y, 1* transform.localScale.z);
    } else if (Input.GetAxisRaw ("Horizontal") == -1) {
        transform.localScale = new Vector3 (-1, 1* transform.localScale.y, 1* transform.localScale.z);
    }


    if(Input.GetKeyDown(KeyCode.Space) && isGrounded){
        rb.AddForce (new Vector2 (0, jumpHeight));
    }
}


void CheckDash(){
    if(Input.GetKeyDown(KeyCode.W) && !dashing && Time.time > nextdashtime){
        dashing = true;
        StartCoroutine ("Dash");
    }
}

IEnumerator Dash(){
    //Before dash loop
    rb.gravityScale = 0f;
    float startDashTime = Time.time;
    float endDashTime = startDashTime + dashDuration;
    float currentDashTime;
    //Dash Loop
    while(Time.time < (startDashTime + dashDuration)){
         currentDashTime = Time.time;
        // The value to lerp by should be the % that time.time is between start time and end time
        rb.velocity = new Vector2 (Mathf.Lerp (startDashSpeed, endDashSpeed, ((currentDashTime - startDashTime) / (endDashTime - startDashTime))),0f);
    }

    //When dash loop is complete
    nextdashtime = Time.time + dashcooldown;
    dashing = false;
    rb.gravityScale = 1;
    yield return null;
}



// FOR CHECKING GROUND CHECK LIMITS
/*void OnDrawGizmos(){
    Gizmos.color = Color.red;
    Gizmos.DrawLine (groundPoint_left.position, groundPoint_right.position);
}*/

}

Answer 1

冲刺你不需要所有这些！

如果你使用刚体，那么下面的代码就可以了：

using UnityEngine;

public class CubeController : MonoBehaviour
{
    private Rigidbody _rigidbody;
    public float Force = 10;

    private void Start()
    {
        _rigidbody = GetComponent<Rigidbody>();
    }

    private void FixedUpdate()
    {
        ForceMode? forceMode = null;

        if (Input.GetKeyDown(KeyCode.W)) // normal
            forceMode = ForceMode.Force;
        else if (Input.GetKeyDown(KeyCode.S)) // dash
            forceMode = ForceMode.Impulse;

        if (forceMode.HasValue)
            _rigidbody.AddRelativeForce(Vector3.forward*Force, forceMode.Value);
    }
}

这是一个使用 3D 的示例，但您对 2D 也是如此：https://docs.unity3d.com/ScriptReference/Rigidbody2D.html

步骤：

• 将刚体组件添加到地面，将其设置为运动学
• 为您的播放器添加刚体组件
• 使用Rigidbody2D 类为您的播放器绘制上述组件
• 根据需要调整参数
• 你现在应该有一个简单而健壮的dashing :)

Answer 2

我在 while 循环中忘记了 yield return null，这让我陷入了无限循环。现在工作正常。

 while(Time.time < (startDashTime + dashDuration)){
     currentDashTime = Time.time;
    // The value to lerp by should be the % that time.time is between start time and end time
    rb.velocity = new Vector2 (Mathf.Lerp (startDashSpeed, endDashSpeed, ((currentDashTime - startDashTime) / (endDashTime - startDashTime))),0f);
    yield return null;
}