家人们，破防啦！！

今天从早上起来就开始画地图，做机关。直到后来发现，左右移动的机关不能带着主角一起移动。

然后经过百度搜索，知道了使用双碰撞体比地面检测盒子要好用一点。然后就开始了我的作死之旅。

通过一番改动，发现梯子上的空气墙设定很难实现，于是想Ctrl+Z回退，却发现回退不了。然后我就改改改，但是怎么改都改不回来，都会出现bug。

然后我想，昨天晚上我保存过，大不了就今天白干嘛！

然后我就点不保存退出，再次打开的时候发现，不仅今天的所有工作白干，而且代码还回不到原来的没有bug的状态。

家人们，我破防了呀！！！

所以大家千万要记得做大的改动之前，一定要备份一下！！！

算了，分享几个我觉得我处理的不错的代码。

关于怪物AI的设定，使用了面向对象的思想。

主要还是延时执行，使在每帧执行的函数Update里不每帧都执行位移，而是在特定条件下才执行。这点我想了很久。

总类：怪物类 ：用于其他怪物继承

using System.Collections;using System.Collections.Generic;using UnityEngine;using UnityEngine.UI;using UnityEngine.EventSystems;// 怪物总类别，唯一不能在面板中更改而需要写代码的只是怪物的攻击方式不同public class MonsterAI : MonoBehaviour{[Header("与怪物距离多少进入攻击距离")]public float attackDistance = 4.0f;[Header("攻击持续时间")]public float attackTime = 2.5f;[Header("攻击后休息时间")]public float changeDirectionTime = 2.0f;[Header("怪物移动的速度")]public float MoveSpeed = 3.0f;[Header("消灭怪物的分数")]public float grade = 20;[Header("死亡预制体")]public GameObject death; // 必须要通过拖拽，在代码中利用tag寻找是找不到的protected float attackDirection = 1; // 怪物攻击方向,默认向左protected float distance; // 怪物与玩家的水平距离protected Animator _animator;protected Rigidbody2D _rigidbody2D;protected GameObject player;protected PlayerController playerController;protected Text Grade;protected int id_attack;protected bool isAttack; protected bool isPatrol = true; // 是否正在巡逻protected bool targeted = false; // 是否锁定目标，为了巡逻和攻击之间的转换protected Vector2 originPosition;protected Vector2 deathPosition;protected virtual void Awake(){_animator = GetComponent<Animator>();_rigidbody2D = GetComponent<Rigidbody2D>();player = GameObject.FindGameObjectWithTag("Player");playerController = player.GetComponent<PlayerController>();Grade = GameObject.FindGameObjectWithTag("Grade").GetComponent<Text>();id_attack = Animator.StringToHash("attack");distance = 100; //解决怪物出生时就攻击的bugoriginPosition = transform.position;}// Update is called once per frameprotected virtual void Update(){if (player != null){distance = transform.position.x - player.transform.position.x;}if (transform.position.y < -10 || transform.position.y > 10){Destroy(gameObject);}if (Mathf.Abs(distance) <= attackDistance){isPatrol = false;}else{isPatrol = true;}}protected virtual void Attack(){JudgeDirection();isAttack = true;_animator.SetBool(id_attack, isAttack);Invoke("Rest", attackTime); // 延时执行休息，也是为了保证攻击时间}// 休息，不再攻击protected virtual void Rest(){_animator.SetBool(id_attack, false);Invoke("AttackAgain", changeDirectionTime); // 延时执行判断方向}// 再次攻击，判断方向protected virtual void AttackAgain(){isAttack = false; // 延时执行使isAttack=false的原因是为了执行完休息动画，也是为了让怪物不瞬间再次进入攻击状态}// 休息时判断方向protected virtual void JudgeDirection() {if (distance >= 0){attackDirection = 1;}else{attackDirection = -1;}_rigidbody2D.transform.localScale = new Vector3(attackDirection, 1, 1);}protected virtual void OnCollisionEnter2D(Collision2D collision){if (collision.collider.tag == "Player"){if ((player.GetComponent<Animator>().GetBool("fall") && player.transform.position.y - transform.position.y >= 0.1f)|| (player.transform.position.y - transform.position.y >= 0.5f && player.GetComponent<Animator>().GetBool("jump"))){playerController.Jump();Grade.text = (int.Parse(Grade.text) + grade).ToString();deathPosition = transform.position;Instantiate(death, deathPosition, Quaternion.identity);Destroy(gameObject);}else{playerController.isHurt = true;}}}}

青蛙类： 开始时待机，玩家进入攻击范围后，向玩家方向跳跃，两秒后停止，判断玩家方向，再次进行攻击，直至玩家脱离青蛙攻击范围。

using System.Collections;using System.Collections.Generic;using UnityEngine;public class Frog : MonsterAI{[Header("跳跃力")]public float JumpForce = 2.0f;[Header("地面检测层")]public LayerMask groundMask;[Header("地面检测盒子的高度")]public float BoxHeight = 0.2f;private Vector2 frogsize; // 青蛙大小private Vector2 boxsize; // 检测盒子尺寸protected override void Awake(){base.Awake();frogsize = GetComponent<SpriteRenderer>().bounds.size;boxsize = new Vector2(frogsize.x * 0.2f, BoxHeight); // 设置检测盒的大小}protected override void Update(){base.Update();}void FixedUpdate(){if (!isPatrol && !isAttack){Attack();}}protected override void Attack(){base.Attack();}protected override void Rest(){base.Rest();}protected override void AttackAgain(){base.AttackAgain();}protected override void JudgeDirection(){base.JudgeDirection();}protected override void OnCollisionEnter2D(Collision2D collision){base.OnCollisionEnter2D(collision);}void Jump(){if (IsOnGround()){_rigidbody2D.velocity = new Vector2(MoveSpeed * -attackDirection, JumpForce);}}private bool IsOnGround(){Vector2 boxcenter = (Vector2)transform.position + (Vector2.down * frogsize.y * 0.3f);return Physics2D.OverlapBox(boxcenter, boxsize, 0, groundMask);}private void OnDrawGizmos(){Vector2 boxcenter = (Vector2)transform.position + (Vector2.down * frogsize.y * 0.3f);Gizmos.color = Color.blue;Gizmos.DrawWireCube(boxcenter, boxsize);}}

负鼠类：开始时左右巡逻，待玩家进入攻击范围后，迅速向玩家冲刺。冲刺1.5秒后，判断方向，再次攻击，直至玩家脱离攻击范围，负鼠再次确定左右边界，进行巡逻。

using System.Collections;using System.Collections.Generic;using UnityEngine;public class Opossum : MonsterAI{private float left, right; // 巡逻的左右边界private int patrolDir = 1; // 巡逻方向，默认向左private float Timer = 3.0f; // 3秒防止巡逻时卡住protected override void Awake(){base.Awake();}protected override void Update(){base.Update();}void FixedUpdate(){if (!isPatrol){if (!isAttack){Attack();}else{transform.position += Vector3.left * attackDirection * MoveSpeed * Time.deltaTime;}}else if (isPatrol){Patrol();}}private void Patrol(){Timer -= Time.deltaTime;if (!targeted){targeted = true;originPosition = transform.position;}_rigidbody2D.transform.localScale = new Vector3(patrolDir, 1, 1);left = originPosition.x - 4;right = originPosition.x + 4;transform.position += Vector3.left * patrolDir * MoveSpeed / 2 * Time.deltaTime;if (transform.position.x < left || transform.position.x > right || Timer <= 0){patrolDir = -patrolDir;Timer = 3.0f;}}protected override void Attack(){base.Attack();targeted = false;}protected override void Rest(){base.Rest();}protected override void AttackAgain(){base.AttackAgain();}protected override void JudgeDirection(){base.JudgeDirection();}protected override void OnCollisionEnter2D(Collision2D collision){base.OnCollisionEnter2D(collision);}}

老鹰类：开始时上下巡逻，待玩家进入攻击范围后，迅速飞向玩家进行攻击。冲刺1.5秒后，判断方向，再次攻击，直至玩家脱离攻击范围，老鹰再次确定上下边界，进行巡逻。 （我觉得难点是老鹰的重力处理以及与玩家碰撞后的弹力处理）

using System.Collections;using System.Collections.Generic;using UnityEngine;public class Eagle : MonsterAI{private float up, down; // 巡逻的上下边界private int patrolDir = 1; // 巡逻方向，默认向上private Vector2 currentDir;protected override void Awake(){base.Awake();}protected override void Update(){base.Update();}void FixedUpdate(){if (!isPatrol){if (!isAttack){Attack();}else {transform.position += (Vector3)currentDir * MoveSpeed * Time.deltaTime;}}else if (isPatrol){Patrol();}}private void Patrol(){if (!targeted){targeted = true;_rigidbody2D.velocity = Vector2.zero;originPosition = transform.position;}_rigidbody2D.transform.localScale = new Vector3(attackDirection, 1, 1);up = originPosition.y + 3;down = originPosition.y - 3;transform.position += Vector3.up * patrolDir * MoveSpeed / 3 * Time.deltaTime;if (transform.position.y < down || transform.position.y > up){patrolDir = -patrolDir;}}protected override void Attack(){if (player != null) // 防止人物在鹰的范围内被击败导致的空引用问题{currentDir = Vector3.Normalize(player.transform.position - transform.position); // 重新转换上下边界}base.Attack();targeted = false;}protected override void Rest(){base.Rest();Patrol();}protected override void AttackAgain(){base.AttackAgain();}protected override void JudgeDirection(){base.JudgeDirection();}protected override void OnCollisionEnter2D(Collision2D collision){base.OnCollisionEnter2D(collision);_rigidbody2D.velocity = Vector2.zero;}}