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 Alex教程每一P的教程原代码加上我自己的理解初步理解写的注释，可供学习Alex教程的人参考
此代码仅为较上一P有所改变的代码

【Unity教程】从0编程制作类银河恶魔城游戏_哔哩哔哩_bilibili

Sword_Skill_Controller.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class Sword_Skill_Controller : MonoBehaviour
{[SerializeField] private float returnSpeed = 12;private bool isReturning;private Animator anim;private Rigidbody2D rb;private CircleCollider2D cd;private Player player;private bool canRotate = true;[Header("Bounce info")][SerializeField]private float bounceSpeed;//设置弹跳速度private bool isBouncing;//判断是否可以弹跳private int amountOfBounce;//弹跳的次数public List<Transform> enemyTargets;//保存所有在剑范围内的敌人的列表private int targetIndex;//设置targetIndex作为敌人计数器private void Awake(){anim = GetComponentInChildren<Animator>();rb = GetComponent<Rigidbody2D>();cd = GetComponent<CircleCollider2D>();}public void ReturnSword(){rb.constraints = RigidbodyConstraints2D.FreezeAll;//修复剑只要不触碰到物体就无法收回的bug//rb.isKinematic = false;transform.parent = null;isReturning = true;}public void SetupSword(Vector2 _dir,float _gravityScale,Player _player){player = _player;rb.velocity = _dir;rb.gravityScale = _gravityScale;anim.SetBool("Rotation", true);}public void SetupBounce(bool _isBouncing,int _amountOfBounce){isBouncing = _isBouncing;amountOfBounce = _amountOfBounce;}private void Update(){if (canRotate)transform.right = rb.velocity;//使武器随着速度而改变朝向if (isReturning){transform.position = Vector2.MoveTowards(transform.position, player.transform.position, returnSpeed * Time.deltaTime);//从原来的位置返回到player的位置//并且随着时间增加而增加速度if (Vector2.Distance(transform.position, player.transform.position) < 1)//当剑与player的距离小于一定距离，清除剑{player.CatchTheSword();}}BounceLogic();}private void BounceLogic(){if (isBouncing && enemyTargets.Count > 0){transform.position = Vector2.MoveTowards(transform.position, enemyTargets[targetIndex].position, bounceSpeed * Time.deltaTime);//3.当可以弹跳且列表内数量大于0，调用ToWords,这将使剑能够跳到敌人身上if (Vector2.Distance(transform.position, enemyTargets[targetIndex].position) < .1f){targetIndex++;amountOfBounce--;//设置弹跳次数if (amountOfBounce <= 0){isBouncing = false;isReturning = true;}//这样会使当弹跳次数为0时，返回到角色手中if (targetIndex >= enemyTargets.Count){targetIndex = 0;}}//利用与目标距离的判断，使剑接近目标距离时切换到下一个目标。//且如果所有目标都跳完了，切回第一个}}private void OnTriggerEnter2D(Collider2D collision)//传入碰到的物体的碰撞器{if (isReturning){return;}//修复在返回时扔出时没有碰到任何物体，但返回时碰到了物体导致剑的一些性质发生改变的问题，及回来的时候调用了OnTriggerEnter2Dif (collision.GetComponent<Enemy>() != null)//首先得碰到敌人，只有碰到敌人才会跳{if (isBouncing && enemyTargets.Count <= 0){Collider2D[] colliders = Physics2D.OverlapCircleAll(transform.position, 10);foreach (var hit in colliders){if (hit.GetComponent<Enemy>() != null){enemyTargets.Add(hit.transform);}}}}StuckInto(collision);}//打开IsTrigger时才可使用该函数//https://docs.unity3d.com/cn/current/ScriptReference/Collider2D.OnTriggerEnter2D.htmlprivate void StuckInto(Collider2D collision){canRotate = false;cd.enabled = false;//相当于关闭碰撞后触发函数。//https://docs.unity3d.com/cn/current/ScriptReference/Collision2D-enabled.htmlrb.isKinematic = true;//开启物理学反应 https://docs.unity3d.com/cn/current/ScriptReference/Rigidbody2D-isKinematic.htmlrb.constraints = RigidbodyConstraints2D.FreezeAll;//冻结所有移动if (isBouncing&&enemyTargets.Count>0)//修复剑卡不到墙上的bugreturn;//终止对动画的改变和终止附在敌人上transform.parent = collision.transform;//设置sword的父组件为碰撞到的物体anim.SetBool("Rotation", false);}}

Sword_Skill.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;public enum SwordType
{Regular,Bounce,Pierce,Spin
}public class Sword_Skill : Skill
{public SwordType swordType = SwordType.Regular;[Header("Bounce Info")][SerializeField] private int amountOfBounce;[SerializeField] private float bounceGravity;[Header("Skill Info")][SerializeField] private GameObject swordPrefab;//sword预制体[SerializeField] private Vector2 launchForce;//发射力度[SerializeField] private float swordGravity;//发射体的重力private Vector2 finalDir;//发射方向[Header("Aim dots")][SerializeField] private int numberOfDots;//需要的点的数量[SerializeField] private float spaceBetweenDots;//相隔的距离[SerializeField] private GameObject dotPrefab;//dot预制体[SerializeField] private Transform dotsParent;//不是很懂private GameObject[] dots;//dot组protected override void Start(){base.Start();GenerateDots();//生成点函数}protected override void Update(){base.Update();if (Input.GetKeyUp(KeyCode.Mouse1)){finalDir = new Vector2(AimDirection().normalized.x * launchForce.x, AimDirection().normalized.y * launchForce.y);//将位移量改为单位向量分别与力度的x，y相乘作为finalDir}if (Input.GetKey(KeyCode.Mouse1)){for (int i = 0; i < dots.Length; i++){dots[i].transform.position = DotsPosition(i * spaceBetweenDots);//用循环为每个点以返回值赋值（传入值为每个点的顺序i*点间距}}}public void CreateSword(){GameObject newSword = Instantiate(swordPrefab, player.transform.position, transform.rotation);//创造实例，初始位置为此时player的位置Sword_Skill_Controller newSwordScript = newSword.GetComponent<Sword_Skill_Controller>();//获得Controllerif(swordType == SwordType.Bounce){swordGravity = bounceGravity;newSwordScript.SetupBounce(true, amountOfBounce);}newSwordScript.SetupSword(finalDir, swordGravity, player);//调用Controller里的SetupSword函数，给予其速度和重力和player实例player.AssignNewSword(newSword);//调用在player中保存通过此方法创造出的sword实例DotsActive(false);//关闭点的显示}#region Aim regionpublic Vector2 AimDirection(){Vector2 playerPosition = player.transform.position;//拿到玩家此时的位置Vector2 mousePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);//https://docs.unity3d.com/cn/current/ScriptReference/Camera.ScreenToWorldPoint.html//大概就是返回屏幕上括号里的参数的位置，这里返回了鼠标的位置//拿到此时鼠标的位置Vector2 direction = mousePosition - playerPosition;//获得距离的绝对向量return direction;//返回距离向量}public void DotsActive(bool _isActive){for (int i = 0; i < dots.Length; i++){dots[i].SetActive(_isActive);//设置每个点是否显示函数}}private void GenerateDots()//生成点函数{dots = new GameObject[numberOfDots];//为dot赋予实例数量for (int i = 0; i < numberOfDots; i++){dots[i] = Instantiate(dotPrefab, player.transform.position, Quaternion.identity, dotsParent);//对象与世界轴或父轴完全对齐//https://docs.unity3d.com/cn/current/ScriptReference/Quaternion-identity.htmldots[i].SetActive(false);//关闭dot}}private Vector2 DotsPosition(float t)//传入顺序相关的点间距{Vector2 position = (Vector2)player.transform.position +new Vector2(AimDirection().normalized.x * launchForce.x,AimDirection().normalized.y * launchForce.y) * t  //基本间距+ .5f * (Physics2D.gravity * swordGravity) * (t * t)//重力影响;//t是控制之间点间距的return position;//返回位置}//设置点间距函数#endregion
}