Collision2D没有被调用

Question

我知道这是一个很常见的问题，但是在我运气不佳的情况下尝试了解决方法。试图使某些对象以统一的方式发生冲突，但是在发生碰撞后不会进行OnCollision2d调用。希望能得到有关为什么发生这种情况的帮助。

此处提供了两个类

[RequireComponent(typeof(SpriteRenderer))]
[RequireComponent(typeof(Rigidbody2D))]
public class Missile: MonoBehaviour
{
    public bool dead = false, hostile = true;
    public float speed = 30,  rotatingSpeed= 200;
    public GameObject target;

    private BoxCollider2D bc;
    private Rigidbody2D rb;
    private SpriteRenderer sr;
    private GameObject go;

    public Missile() { Debug.Log("Constructed"); }
    private void OnEnable()
    {
        Debug.Log("Missile Launched");

        go     = new GameObject("Missile");
        go.tag = "Missile";
        target = GameObject.FindGameObjectWithTag("Ship");

        rb = go.AddComponent<Rigidbody2D> ();
        sr = go.AddComponent<SpriteRenderer> ();
        bc = go.AddComponent<BoxCollider2D>();
        bc.size = new Vector2(2f, 2f);

        //bc.isTrigger = true;
        go.transform.position = new Vector3(0,0, 11);
        sr.sprite = SpriteManager.current.GetSprite("Ships", "missile1");
    }
    private void FixedUpdate() 
    {
        //sr.sprite = SpriteManager.current.GetSprite("Missiles", "missile1");
        //Debug.Log(target);
        if (!target) return;

        var point2Target = (Vector2) go.transform.position - (Vector2) target.transform.position;
        point2Target.Normalize();

        float value = Vector3.Cross(point2Target, go.transform.right).z;
        rb.angularVelocity = rotatingSpeed * value;
        //Vector2 lastVel = rb.velocity;
        rb.velocity = go.transform.right * speed;
        //rb.AddForce(go.transform.right * speed);
    }
    public void setPosition(int x, int y)
    {
        go.transform.position = new Vector3(x,y,11);
    }
    private void OnCollisionEnter2D(Collision2D collision)
    {
        Debug.Log("hit");
        Destroy (go, 0.02f);
    }
    private void OnTriggerEnter2D(Collider2D other)
    {
        Debug.Log("hit");
        Destroy (go, 0.02f);
    }
}

第二班

[RequireComponent(typeof(SpriteRenderer))]
[RequireComponent(typeof(Rigidbody2D))]
public class Ship: MonoBehaviour 
{
    public int hull  = 100, type = 1;
    public bool dead = false;
    public float speed = 5, rotatingSpeed= 200;
    public GameObject target;

    private BoxCollider2D bc;
    private Rigidbody2D rb;
    private SpriteRenderer sr;
    private GameObject go;

    public Ship() { Debug.Log("Constructor"); }
    private void OnEnable() 
    {
        Debug.Log("Ship Built");
        go = new GameObject("Ship");
        go.tag = "Ship";
        //target = GameObject.FindGameObjectWithTag("Player");

        rb = go.AddComponent<Rigidbody2D> ();
        sr = go.AddComponent<SpriteRenderer> ();
        bc = go.AddComponent<BoxCollider2D>();

        bc.size = new Vector2(2f, 2f);;
        bc.isTrigger = true;
        go.transform.position = new Vector3(0,0,11);
        sr.sprite = SpriteManager.current.GetSprite("Ships", "ship2");
        //sr.sprite.transform.localScale = anyWidth;
        //sr.sprite = SpriteManager.current.GetSprite("Missiles", "missile1");
    }
    void FixedUpdate () 
    {
        //Debug.Log(target);        
        GameObject[] missiles = GameObject.FindGameObjectsWithTag("Missile");
        /*foreach (GameObject missile in missiles)
        {
            Vector2 point2Target = ((Vector2)go.transform.position - (Vector2) missile.transform.position);
            if(point2Target.magnitude < 50)
            {
                point2Target.Normalize();
                Flak flak = gameObject.AddComponent<Flak>();
                flak.setPosition(go.transform.position);
                point2Target.x = point2Target.x * -1;
                point2Target.y = point2Target.y * -1;
                flak.setVelocity(point2Target * 50);
                break;
            }
        }*/
        if (target != null) 
        {
            var point2Target = (Vector2) go.transform.position - (Vector2) target.transform.position;
            point2Target.Normalize();

            float value = Vector3.Cross(point2Target, go.transform.right).z;
            rb.angularVelocity = rotatingSpeed * value;
            rb.velocity = go.transform.right * speed;
            //Vector2 lastVel = rb.velocity;
            //rb.AddForce(go.transform.right * speed;);
        }
    }
    public void setPosition(int x, int y) { go.transform.position = new Vector3(x,y,11); }
    private void OnCollisionEnter2D(Collision2D collision)
    {
        Debug.Log("hit");
        Destroy (go, 0.02f);
    }
    private void OnTriggerEnter2D(Collider2D other)
    {
        Debug.Log("hit");
        Destroy (go, 0.02f);
    }
}

最后是调用

if (Input.GetKeyUp("i")) 
{
    var ship = gameObject.AddComponent<Ship>();
    ship.setPosition((int)currFramePosition.x, (int)currFramePosition.y);
}
if (Input.GetKeyUp("v"))
{
    var missile = gameObject.AddComponent<Missile>();
    missile.setPosition((int)currFramePosition.x, (int)currFramePosition.y);
    Debug.Log(missile);
}

感谢您的帮助。