Question

我的播放器没有死，并且控制台给我的错误是：

NullReferenceException：对象引用未设置为的实例对象Movement.OnCollisionEnter2D（UnityEngine.Collision2D碰撞）（在Assets / Scripts / Movement.cs：74。

我的位置已经有了标签，但是游戏仍然给了我这个标签。地面也有对撞机+刚体2d

public class Movement : MonoBehaviour
{
    public float moveSpeed = 300;
    public GameObject character;
    private Rigidbody2D characterBody;
    private float ScreenWidth;
    private Rigidbody2D rb2d;
    private Score gm;
    public bool isDead = false;
    public Vector2 jumpHeight;

    void Start()
    {
        ScreenWidth = Screen.width;
        characterBody = character.GetComponent<Rigidbody2D>();
        gm = GameObject.FindGameObjectWithTag("gameMaster").GetComponent<Score>();
    }

    // Update is called once per frame
    void Update()
    {
        if (isDead) { return; }
        if (Input.GetMouseButtonDown(0) || Input.GetKeyDown(KeyCode.Space))  //makes player jump
        {
            GetComponent<Rigidbody2D>().AddForce(jumpHeight, ForceMode2D.Impulse);
        }
        int i = 0;
        while (i < Input.touchCount)
        {
            if (Input.GetTouch(i).position.x > ScreenWidth / 2)
            {
                RunCharacter(1.0f);

            }
            if (Input.GetTouch(i).position.x < ScreenWidth / 2)
            {
                RunCharacter(-1.0f);
            }
            ++i;
        }
    }

    void FixedUpdate()
    {
#if UNITY_EDITOR
        RunCharacter(Input.GetAxis("Horizontal"));
#endif 

    }

    private void RunCharacter(float horizontalInput)
    {
        characterBody.AddForce(new Vector2(horizontalInput * moveSpeed * Time.deltaTime, 0));

    }

    private void OnCollisionEnter2D(Collision2D collision)
    {
        if (collision.gameObject.CompareTag("ground")) // this will return true if the collision gameobject has ground tag on it.
        {
            isDead = true;
            rb2d.velocity = Vector2.zero;
            GameController.Instance.Die();
        }
    }

    void OnTriggerEnter2D(Collider2D col)
    {
        if (col.CompareTag("coin"))
        {
            Destroy(col.gameObject);
            gm.score += 1;
        }
    }
}

Answer 1

正如BugFinder所说，您从未说过哪一行是74行。我可以看到的一件事是，您永远不会为rb2d设置值。在您的Start（）方法中，您可以添加：

rb2d = GetComponent<Rigidbody2D>();

这应该可以解决该问题。如果还有其他任何内容，请评论并说出第74行。：）

带有标签地面的玩家不会死于地面

1 个答案: