对象引用未设置为对象Unity3D C＃的实例

Question

这是播放器脚本：

public class player
{      public projectile pro;
       pro = GetComponent<projectile>();
    void Update()
    {
        GameObject go = GameObject.Find("enemy");
        Transform playerTransform = go.transform;
        Vector3 posi = playerTransform.position;
        pro.Target = posi; // getting error here
        Instantiate(bulletprefab, position, Quaternion.identity);   
    }
}

这是Projectile脚本：要求：获取Target在Projectile中的更新位置，但是由于从Start()调用了projectileMotion()方法，并且我希望在Player调用Instantiate时的目标当前位置，以便在Target_Distance适当地计算Target_Distance射弹类，但是看起来像是从Vector3到_pro.Target的赋值，后者仅是vector3。 我能解决这个问题吗？

 public class projectile : MonoBehaviour 
{
    public Vector3 Target;
    public GameObject bulletprefab;
        public float firingAngle = 45.0f;
        public float gravity = 9.8f;
       public Transform Projectile;      
        private Transform myTransform;

        void Awake()
        {
            myTransform = transform;  

        }

        void Start()
    {    myTransform.LookAt(Target);
        StartCoroutine (ProjectileMotion ());

        }



        IEnumerator ProjectileMotion()
        {

            yield return new WaitForSeconds(0.25f);


            Projectile.position = myTransform.position + new Vector3(0, 0.0f, 0);

            // Calculating distance to target
        float target_Distance = Vector3.Distance(Projectile.position, Target );
        Debug.Log ("realUPDATEDOR not" + Target);

            float projectile_Velocity = target_Distance / (Mathf.Sin(2 * firingAngle* Mathf.Deg2Rad) / gravity);

            // X  Y componenent of the velocity
            float Vx = Mathf.Sqrt(projectile_Velocity) * Mathf.Cos(firingAngle * Mathf.Deg2Rad);
            float Vy = Mathf.Sqrt(projectile_Velocity) * Mathf.Sin(firingAngle * Mathf.Deg2Rad);

            // flight time since depends on horizontal component of velocity
            float flightDuration = target_Distance / Vx;

            // projectile rotated at target
            Projectile.rotation = Quaternion.LookRotation(Target - Projectile.position);

            float elapse_time = 0;

            while (elapse_time < flightDuration)               //looping and incrementing elapsed time
            {
                Projectile.Translate(0, (Vy - (gravity * elapse_time)) * Time.deltaTime, Vx * Time.deltaTime);

                elapse_time += Time.deltaTime;

                yield return null;
            }
        }  
    }

目标存在于Projectile类中，并且仅是Vector3，如何解决此错误？

Answer 1

您获得对“弹丸”脚本的引用的代码将无法工作。

变化：

public projectile pro;    
pro = GetComponent<projectile>();

像这样：

public projectile pro;
void Start()
{
pro = GetComponent<projectile>();
}

另外建议您可能要减少GameObject.Find在更新函数中的使用，原因是其成本高昂。