塔防游戏学习日记（二）之朝敌人发射子弹

public class TurretAttack : MonoBehaviour {

    public List<GameObject> enemys = new List<GameObject>();
    public Transform head;

    private void OnTriggerEnter(Collider other)
    {
        if (other.tag == "enemy")
        {
            enemys.Add(other.gameObject);
        }
    }
    private void OnTriggerExit(Collider other)
    {
        if (other.tag == "enemy")
        {
            enemys.Remove(other.gameObject);
        }
    }
    public float attackTimes = 1;//控制攻击速度
    private float times=0;//计时器控制攻击速度
    public GameObject buttlePerfab;//子弹预制体
    public Transform firePosition;//定义子弹发射点

    private void Start()
    {
        times = attackTimes;//确保至少发射一枚子弹
    }
    private void Update()
    {
        for (int i = 0; i <= enemys.Count - 1; i++)
        { 
            //敌人在炮塔范围内销毁后移除集合
            if (enemys[i] == null)
            {
                enemys.RemoveAt(i);
            }
        }    
        //在进入炮塔范围后开始计时
        if (enemys.Count > 0)
        {
            times += Time.deltaTime;
        }
        if (enemys.Count > 0)//这个是改变炮塔朝向的，暂时不必理会
        {
            Vector3 targetPosition = enemys[0].transform.position;
            targetPosition.y = head.position.y;
            head.LookAt(targetPosition);
        }       
        if (enemys.Count>0&&times >= attackTimes)//判断发射条件
        {
            times -= attackTimes;
            attack();
        }
    }
    void attack()//攻击方法
    {
        GameObject bullet=
        GameObject.Instantiate(buttlePerfab, firePosition.position, firePosition.rotation);
        bullet.GetComponent<StaTurBullet>().SetTarget(enemys[0].transform);//调用StaTurBullet中的制定目标方法
    }
}