Question

我有这段代码，可以在Unity的场景中移动卡车：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class TruckMovement : MonoBehaviour
{
Coroutine TruckC;
bool forward = false;
Rigidbody2D truck;
bool collisionTruck = false;

void Start()
{
    truck = GetComponent<Rigidbody2D>();
    TruckC = StartCoroutine(Truck());
}

void OnDestroy()
{
    StopCoroutine(TruckC);
}




IEnumerator Truck()
{
    while(true)
    {
        if(forward)
        {
            truck.velocity = Vector3.right;
        }
        else
        {
            truck.velocity = Vector3.left;
        }
        yield return new WaitUntil(() => collisionTruck != true);
        forward = !forward;
    }
}

void OnCollisionEnter2D(Collision2D collision)
{
    if (collision.collider.tag.Equals("Bound"))
    {
        collisionTruck = true;
    }
}

void OnCollisionExit2D(Collision2D collision)
{
    if (collision.collider.tag.Equals("Bound"))
    {
        collisionTruck = false;
    }
}
}

我想要的是从一个点到另一个点然后返回。

我的场景很奇怪，所以我画了一张可怕的照片。

此外，还有现场图片：

问题在于卡车没有移动并且在振动。

我该如何解决？

Answer 1

您为什么还要为此使用协程？

实际上，您可以简单地以一种简单的方法直接执行此操作，而不必处理任何标志或像这样等待：

public class TruckMovement : MonoBehaviour
{
    private bool forward = false;
    private Rigidbody2D truck;

    private void Awake()
    {
        truck = GetComponent<Rigidbody2D>();
    }

    private void Start()
    {
        // Start moving at the beginning
        ChangeDirection();
    }

    private void ChangeDirection()
    {
        forward = !forward;

        truck.velocity = forward ? Vector2.right : Vector2.left;      
    }

    private void OnCollisionEnter2D(Collision2D collision)
    {
        if (collision.collider.tag.Equals("Bound"))
        {
            ChangeDirection();
        }
    }
}

Answer 2

如果您将collisionTruck初始化为true，我认为您的问题将得到解决：

bool collisionTruck = true;

现在您已将其初始化为false，并且每次将其初始化为false都会改变方向：

yield return new WaitUntil(() => collisionTruck != true);
forward = !forward;

我个人将变量名更改为shouldChangeDirection，使您的代码看起来像这样：

/* More stuff */

bool shouldChangeDirection = false;

/* More stuff*/

IEnumerator Truck()
{
    while(true)
    {
        if (forward)
        {
            truck.velocity = Vector3.right;
        }
        else
        {
            truck.velocity = Vector3.left;
        }
        yield return new WaitUntil(() => shouldChangeDirection);
        forward = !forward;
    }
}

void OnCollisionEnter2D(Collision2D collision)
{
    if (collision.collider.tag.Equals("Bound"))
    {
        shouldChangeDirection = true;
    }
}

void OnCollisionExit2D(Collision2D collision)
{
    if (collision.collider.tag.Equals("Bound"))
    {
        shouldChangeDirection = false;
    }
}

GameObject没有按预期移动

2 个答案: