小编use*_*003的帖子

我正在学习教程，我理解了其中的大部分内容。我想问1件事。这是我正在遵循的教程：

https://noobtuts.com/unity/2d-pong-game

该方法称为函数 HitFactor。

if (col.gameObject.name == "RacketLeft") {
        // Calculate hit Factor
        float y = hitFactor(transform.position, col.transform.position, col.collider.bounds.size.y);

        // Calculate direction, make length=1 via .normalized
        Vector2 dir = new Vector2(1, y).normalized;

        // Set Velocity with dir * speed
        GetComponent<Rigidbody2D>().velocity = dir * speed;
    }

命中因子方法是

   float hitFactor(Vector2 ballPos, Vector2 racketPos,
                    float racketHeight) {
        // ascii art:
        // ||  1 <- at the top of the racket
        // ||
        // ||  0 <- at the middle of the racket
        // …

我收到上述错误,我尝试使用debug.log打印错误的位置.我正在创造一种坦克obj.哪个实例化了obj.实例化对象是攻击者.

在更新中,我使用foreach循环遍历所有实例化对象.如果找到并且If对象在射程范围内.

void Update () {


        if (attacker!= null  )
        {
            //Debug.Log("inside att");
            attacker = FindObjectsOfType<Attacker>();
        }

        // fire only if attacker is in range 

        if (IfInRange() && attacker!= null && running)
        {

            faceTowardTarget();
            Fire();
        }


    }
    bool IfInRange()
    {// run through all the instantiated attacker
        foreach (Attacker currentAttacker in attacker)

这工作正常,但有些时候会给出上面的结果.在控制台的最后,循环继续进行,currentAttacker最后为空.我试着在控制台中打印它.但它不会进入其他if语句

{   //if attacker is in range

            if (attacker != null )
                {

                    Debug.Log(currentAttacker.GetComponent<Health>().isAlive);

                    if (Vector2.Distance(transform.position, currentAttacker.transform.position) < minDistance)               
                    {

                        attackerPos = currentAttacker.transform;

                        return true;
                    }
                }
                if (currentAttacker …