[Unity Demo]从零开始制作空洞骑士Hollow Knight第十集：制作后坐力系统Recoil和小骑士的生命系统和受伤系统

1.使用代码实现扩展新的后坐力行为

为每一个敌人添加一个新的脚本叫Recoil.cs:

在打代码之前我们先想想后坐力行为有几种状态：Ready准备进入状态，Frozen冻结状态，Recoiling正在后坐力状态

需要的变量：private float recoilDuration; //后坐力持续时间

private float recoilSpeedBase = 15f; //基本后坐力速度

 public bool freezeInPlace; //是否会不动

以及取消后坐力后的事件，冻结时的事件：

    public delegate void CancelRecoilEvent();
    public event CancelRecoilEvent OnCancelRecoil;

    public delegate void FreezeEvent();
    public event FreezeEvent OnHandleFreeze;

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Recoil : MonoBehaviour
{
    private Rigidbody2D rb2d;
    private Collider2D bodyCollider;

    [SerializeField] private bool recoilUp; //是否有向上的后坐力
    [SerializeField] private float recoilSpeedBase = 15f; //基本后坐力速度
    [SerializeField] private float recoilDuration; //后坐力持续时间
    [SerializeField] public bool freezeInPlace; //是否会不动
    [SerializeField] private bool stopVelocityXWhenRecoilingUp; //当正在受上后坐力的时候停止X轴方向的速度
    [SerializeField] private bool preventRecoilUp;

    private bool skipFreezingByController;
    [SerializeField]private States state;
    private float recoilTimeRemaining; //后坐力持续时间
    private float recoilSpeed;//最终后坐力的速度
    private Sweep recoilSweep; //检测地形
    private bool isRecoilSweeping; //是否
    private const int SweepLayerMask = 256; //也就是Layer "Terrain"

    public delegate void CancelRecoilEvent();
    public event CancelRecoilEvent OnCancelRecoil;

    public delegate void FreezeEvent();
    public event FreezeEvent OnHandleFreeze;

    public bool SkipFreezingByController
    {
	get
	{
	    return skipFreezingByController;
	}
	set
	{
	    skipFreezingByController = value;
	}
    }

    public bool IsRecoiling
    {
	get
	{
	    return state == States.Recoiling || state == States.Frozen;
	}
    }

    protected void Reset()
    {
	freezeInPlace = false;
	stopVelocityXWhenRecoilingUp = true;
	recoilDuration = 0.5f;
	recoilSpeedBase = 15f;
	preventRecoilUp = false;
    }

    protected void Awake()
    {
	rb2d = GetComponent<Rigidbody2D>();
	bodyCollider = GetComponent<BoxCollider2D>();
    }

    private void OnEnable()
    {
	CancelRecoil();
    }

    protected void FixedUpdate()
    {
	UpdatePhysics(Time.fixedDeltaTime);
    }

    /// <summary>
    /// 更新游戏对象的物理行为
    /// </summary>
    /// <param name="deltaTime"></param>
    private void UpdatePhysics(float deltaTime)
    {
	if(state == States.Frozen)
	{
	    if(rb2d != null)
	    {
		rb2d.velocity = Vector2.zero;
	    }
	    recoilTimeRemaining -= deltaTime;
	    if(recoilTimeRemaining <= 0f)
	    {
		CancelRecoil();
		return;
	    }
	}
	else if(state == States.Recoiling)
	{
	    if (isRecoilSweeping)
	    {
		float num;
		if(recoilSweep.Check(transform.position,recoilSpeed * deltaTime, SweepLayerMask,out num))
		{
		    isRecoilSweeping = false;
		}
		if(num > Mathf.Epsilon)
		{
		    transform.Translate(recoilSweep.Direction * num, Space.World);
		}
	    }
	    recoilTimeRemaining -= deltaTime;
	    if (recoilTimeRemaining <= 0f)
	    {
		CancelRecoil();
	    }
	}
    }

    /// <summary>
    /// 在某个方向上受后坐力的行为
    /// </summary>
    /// <param name="attackDirection"></param>
    /// <param name="attackMagnitude"></param>
    public void RecoilByDirection(int attackDirection,float attackMagnitude)
    {
	if(state != States.Ready)
	{
	    return;
	}
	if (freezeInPlace)
	{
	    Freeze();
	    return;
	}
	if(attackDirection == 1&& preventRecoilUp)
	{
	    return;
	}
	if (bodyCollider == null)
	{
	    bodyCollider = GetComponent<Collider2D>();
	}
	state = States.Recoiling;
	recoilSpeed = recoilSpeedBase * attackMagnitude;
	recoilSweep = new Sweep(bodyCollider, attackDirection, 3, 0.1f);
	isRecoilSweeping = true;
	recoilTimeRemaining = recoilDuration;
	switch (attackDirection)
	{
	    case 0:
		FSMUtility.SendEventToGameObject(gameObject, "RECOIL HORIZONTAL", false);
		FSMUtility.SendEventToGameObject(gameObject, "HIT RIGHT", false);
		break;
	    case 1:
		FSMUtility.SendEventToGameObject(gameObject, "HIT UP", false);
		break;
	    case 2:
		FSMUtility.SendEventToGameObject(gameObject, "RECOIL HORIZONTAL", false);
		FSMUtility.SendEventToGameObject(gameObject, "HIT LEFT", false);
		break;
	    case 3:
		FSMUtility.SendEventToGameObject(gameObject, "HIT DOWN", false);
		break;
	}
	UpdatePhysics(0f);
    }

    /// <summary>
    /// 冻结状态发生的行为
    /// </summary>
    private void Freeze()
    {
	if (skipFreezingByController)
	{
	    if (OnHandleFreeze != null)
	    {
		OnHandleFreeze();
	    }
	    state = States.Ready;
	    return;
	}
	state = States.Frozen;
	if(rb2d != null)
	{
	    rb2d.velocity = Vector2.zero;
	}
	PlayMakerFSM playMakerFSM = PlayMakerFSM.FindFsmOnGameObject(gameObject, "Climber Control");
	if(playMakerFSM != null)
	{
	    playMakerFSM.SendEvent("FREEZE IN PLACE");
	}
	recoilTimeRemaining = recoilDuration;
	UpdatePhysics(0f);
    }

    public void CancelRecoil()
    {
	if(state != States.Ready)
	{
	    state = States.Ready;
	    if (OnCancelRecoil != null)
	    {
		OnCancelRecoil();
	    }
	}
    }

    public void SetRecoilSpeed(float newSpeed)
    {
	recoilSpeedBase = newSpeed;
    }

    private enum States
    {
	Ready,
	Frozen,
	Recoiling
    }
}

还记得我们制作敌人行为（我记得是Walker.cs）的时候用到的Sweep结构体，当时被用于与地面的碰撞检测，这一次我们还是要用到它，这次我再把代码贴出来吧：

using System;
using UnityEngine;

public struct Sweep
{
    public int CardinalDirection;//基数(1-9的数字)的方向
    public Vector2 Direction;
    public Vector2 ColliderOffset;
    public Vector2 ColliderExtents;
    public float SkinThickness;
    public int RayCount;
    public const float DefaultSkinThickness = 0.1f;
    public const int DefaultRayCount = 3;

    public Sweep(Collider2D collider, int cardinalDirection, int rayCount, float skinThickness = DefaultSkinThickness)
    {
	CardinalDirection = cardinalDirection;
	Direction = new Vector2(DirectionUtils.GetX(cardinalDirection), DirectionUtils.GetY(cardinalDirection));
	ColliderOffset = collider.offset.MultiplyElements(collider.transform.localScale);
	ColliderExtents = collider.bounds.extents;
	RayCount = rayCount;
	SkinThickness = skinThickness;
    }

    public bool Check(Vector2 offset, float distance, int layerMask)
    {
	float num;
	return Check(offset, distance, layerMask, out num);
    }

    public bool Check(Vector2 offset, float distance, int layerMask, out float clippedDistance)
    {
	if (distance <= 0f)
	{
	    clippedDistance = 0f;
	    return false;
	}
	Vector2 a = ColliderOffset + Vector2.Scale(ColliderExtents, Direction);
	Vector2 a2 = Vector2.Scale(ColliderExtents, new Vector2(Mathf.Abs(Direction.y), Mathf.Abs(Direction.x)));
	float num = distance;
	for (int i = 0; i < RayCount; i++)
	{
	    float d = 2f * ((float)i / (float)(RayCount - 1)) - 1f;
	    Vector2 b = a + a2 * d + Direction * -SkinThickness;
	    Vector2 vector = offset + b;
	    RaycastHit2D hit = Physics2D.Raycast(vector, Direction, num + SkinThickness, layerMask);
	    float num2 = hit.distance - SkinThickness;
	    if (hit && num2 < num)
	    {
		num = num2;
		Debug.DrawLine(vector, vector + Direction * hit.distance, Color.red);
	    }
	    else
	    {
		Debug.DrawLine(vector, vector + Direction * (distance + SkinThickness), Color.green);
	    }
	}
	clippedDistance = num;
	return distance - num > Mathf.Epsilon;
    }
}

2.为敌人脚本添加后坐力行为

然后回到我们之间创作的代码，为敌人脚本添加上后坐力的系统，这里先从Climber.cs开始，在Start()函数中：我们订阅这个事件并实现这个事件Stun:速度设置为0，播放Stun动画后回到Walk()状态，

Recoil component = GetComponent<Recoil>();
    if (component)
    {
        component.SkipFreezingByController = true;
        component.OnHandleFreeze += Stun;
    }

 public void Stun()
    {
    if(turnRoutine == null)
    {
        StopAllCoroutines();
        StartCoroutine(DoStun());
    }
    }

    private IEnumerator DoStun()
    {
    body.velocity = Vector2.zero;
    yield return StartCoroutine(anim.PlayAnimWait("Stun"));
    StartCoroutine(Walk());
    }

完整的代码如下：

using System;
using System.Collections;
using UnityEngine;

public class Climber : MonoBehaviour
{
    private tk2dSpriteAnimator anim;
    private Rigidbody2D body;
    private BoxCollider2D col;

    public bool startRight; //开始的方向是右边

    private bool clockwise; //是否顺时针旋转
    public float speed;//移动速度
    public float spinTime; //旋转时间
    [Space]
    public float wallRayPadding; //墙壁射线检测距离
    [Space]
    public Vector2 constrain; //束缚

    public float minTurnDistance; //最小转向距离

    private Vector2 previousPos;
    private Vector2 previousTurnPos;
    [SerializeField]private Direction currentDirection; //Debug用，发现没问题可以删了[SerializeField]
    private Coroutine turnRoutine; //给转向设置为协程，循序渐进的实现转身的效果

    public Climber()
    {
	startRight = true;
	clockwise = true;
	speed = 2f;
	spinTime = 0.25f;
	wallRayPadding = 0.1f;
	constrain = new Vector2(0.1f, 0.1f);
	minTurnDistance = 0.25f;
    }

    private void Awake()
    {
	//公式化三件套
	anim = GetComponent<tk2dSpriteAnimator>();
	body = GetComponent<Rigidbody2D>();
	col = GetComponent<BoxCollider2D>();
    }

    private void Start()
    {
	StickToGround();
	float num = Mathf.Sign(transform.localScale.x);
	if (!startRight)
	{
	    num *= -1f;
	}
	clockwise = num > 0f; //判断是顺时针还是逆时针
	float num2 = transform.eulerAngles.z % 360f;
	//获取开始游戏时climber当前方向
	if(num2 > 45f && num2 <= 135f)
	{
	    currentDirection = clockwise ? Direction.Up : Direction.Down;
	}
	else if(num2 > 135f && num2 <= 225f)
	{
	    currentDirection = clockwise ? Direction.Left : Direction.Right;
	}
	else if (num2 > 225f && num2 <= 315f)
	{
	    currentDirection = clockwise ? Direction.Down : Direction.Up;
	}
	else
	{
	    currentDirection = clockwise ? Direction.Right : Direction.Left;
	}
	Recoil component = GetComponent<Recoil>();
	if (component)
	{
	    component.SkipFreezingByController = true;
	    component.OnHandleFreeze += Stun;
	}
	previousPos = transform.position;
	StartCoroutine(Walk());
    }

    private IEnumerator Walk()
    {
	anim.Play("Walk");
	body.velocity = GetVelocity(currentDirection);
	for(; ; )
	{
	    Vector2 vector = transform.position;
	    bool flag = false;
	    if(Mathf.Abs(vector.x - previousPos.x) > constrain.x)
	    {
		vector.x = previousPos.x;
		flag = true;
	    }
	    if (Mathf.Abs(vector.y - previousPos.y) > constrain.y)
	    {
		vector.y = previousPos.y;
		flag = true;
	    }
	    if(flag)
	    {
		transform.position = vector;
	    }
	    else
	    {
		previousPos = transform.position;
	    }
	    if (Vector3.Distance(previousTurnPos, transform.position) >= minTurnDistance)
	    {
		if (!CheckGround())
		{
		    turnRoutine = StartCoroutine(Turn(clockwise, false));
		    yield return turnRoutine;
		}
		else if (CheckWall()) //当不在地面上以及碰到墙壁后挂机并执行Turn协程
		{
		    turnRoutine = StartCoroutine(Turn(!clockwise, true));
		    yield return turnRoutine;
		}
	    }
	    yield return null;
	}
    }

    private IEnumerator Turn(bool turnClockwise, bool tweenPos = false)
    {
	body.velocity = Vector2.zero;
	float currentRotation = transform.eulerAngles.z;
	float targetRotation = currentRotation + (turnClockwise ? -90 : 90);
	Vector3 currentPosition = transform.position;
	Vector3 targetPosition = currentPosition + GetTweenPos(currentDirection);
	for (float elapsed = 0f; elapsed < spinTime; elapsed += Time.deltaTime)
	{
	    float t = elapsed / spinTime;
	    transform.SetRotation2D(Mathf.Lerp(currentRotation, targetRotation, t)); //更改rotation和position
	    if (tweenPos)
	    {
		transform.position = Vector3.Lerp(currentPosition, targetPosition, t);
	    }
	    yield return null;
	}
	transform.SetRotation2D(targetRotation);
	int num = (int)currentDirection;
	num += (turnClockwise ? 1 : -1);
	int num2 = Enum.GetNames(typeof(Direction)).Length; //4
	//防止数字超出枚举长度或者小于0
	if(num < 0)
	{
	    num = num2 - 1;
	}
	else if(num >= num2)
	{
	    num = 0;
	}
	currentDirection = (Direction)num;
	body.velocity = GetVelocity(currentDirection);
	previousPos = transform.position;
	previousTurnPos = previousPos;
	turnRoutine = null;
    }

    /// <summary>
    /// 不同方向上赋值的速度不同
    /// </summary>
    /// <param name="direction"></param>
    /// <returns></returns>
    private Vector2 GetVelocity(Direction direction)
    {
	Vector2 zero = Vector2.zero;
	switch (direction)
	{
	    case Direction.Right:
		zero = new Vector2(speed, 0f);
		break;
	    case Direction.Down:
		zero = new Vector2(0f, -speed);
		break;
	    case Direction.Left:
		zero = new Vector2(-speed, 0f);
		break;
	    case Direction.Up:
		zero = new Vector2(0f, speed);
		break;
	}
	return zero;
    }

    private bool CheckGround()
    {
	return FireRayLocal(Vector2.down, 1f).collider != null;
    }

    private bool CheckWall()
    {
	return FireRayLocal(clockwise ? Vector2.right : Vector2.left, col.size.x / 2f + wallRayPadding).collider != null;
    }

    /// <summary>
    /// 以后做到人物攻击时才要用到
    /// </summary>
    public void Stun()
    {
	if(turnRoutine == null)
	{
	    StopAllCoroutines();
	    StartCoroutine(DoStun());
	}
    }

    private IEnumerator DoStun()
    {
	body.velocity = Vector2.zero;
	yield return StartCoroutine(anim.PlayAnimWait("Stun"));
	StartCoroutine(Walk());
    }

    private RaycastHit2D FireRayLocal(Vector2 direction, float length)
    {
	Vector2 vector = transform.TransformPoint(col.offset);
	Vector2 vector2 = transform.TransformDirection(direction);
	RaycastHit2D result = Physics2D.Raycast(vector, vector2, length, LayerMask.GetMask("Terrain"));
	Debug.DrawRay(vector, vector2);
	return result;
    }

    private Vector3 GetTweenPos(Direction direction)
    {
	Vector2 result = Vector2.zero;
	switch (direction)
	{
	    case Direction.Right:
		result = (clockwise ? new Vector2(col.size.x / 2f, col.size.y / 2f) : new Vector2(col.size.x / 2f, -(col.size.y / 2f)));
		result.x += wallRayPadding;
		break;
	    case Direction.Down:
		result = (clockwise ? new Vector2(col.size.x / 2f, -(col.size.y / 2f)) : new Vector2(-(col.size.x / 2f), -(col.size.y / 2f)));
		result.y -= wallRayPadding;
		break;
	    case Direction.Left:
		result = (clockwise ? new Vector2(-(col.size.x / 2f), -(col.size.y / 2f)) : new Vector2(-(col.size.x / 2f), col.size.y / 2f));
		result.x -= wallRayPadding;
		break;
	    case Direction.Up:
		result = (clockwise ? new Vector2(-(col.size.x / 2f), col.size.y / 2f) : new Vector2(col.size.x / 2f, col.size.y / 2f));
		result.y += wallRayPadding;
		break;
	}
	return result;
    }

    /// <summary>
    /// 在开始游戏时让它粘在离它向下射线2f最近的地面。
    /// </summary>
    private void StickToGround()
    {
	RaycastHit2D raycastHit2D = FireRayLocal(Vector2.down, 2f);
	if(raycastHit2D.collider != null)
	{
	    transform.position = raycastHit2D.point;
	}
    }

    private enum Direction
    {
	Right,
	Down,
	Left,
	Up
    }
}

然后回到Crawler.cs代码中：

  private Recoil recoil;

recoil = GetComponent<Recoil>();

在Start()函数中订阅OnCancelRecoil事件，当取消后坐力后让速度回到原始的速度，通过类型判断是否应该开启freezeInPlace:

recoil.SetRecoilSpeed(0f);
    recoil.OnCancelRecoil += delegate()
    {
        body.velocity = velocity;
    };
    CrawlerType crawlerType = type;
    if(crawlerType != CrawlerType.Floor)
    {
        if(crawlerType - CrawlerType.Roof <= 1)
        {
        body.gravityScale = 0;//如果在墙面面上rb2d的重力就设置为1
        recoil.freezeInPlace = true;         
        }
    }
    else
    {
        body.gravityScale = 1; //如果在地面上rb2d的重力就设置为1
        recoil.freezeInPlace = false;
    }

完整的代码如下：

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Crawler : MonoBehaviour
{
    public float speed;
    [Space]
    public Transform wallCheck; //墙面检测的位置
    public Transform groundCheck; //地面检测的位置
    private Vector2 velocity; //记录速度
    private CrawlerType type;

    private Rigidbody2D body;
    private Recoil recoil;
    private tk2dSpriteAnimator anim;

    private void Awake()
    {
	body = GetComponent<Rigidbody2D>();
	recoil = GetComponent<Recoil>();
	anim = GetComponent<tk2dSpriteAnimator>();
    }

    private void Start()
    {
	float z = transform.eulerAngles.z;
	//通过transform.eulerAngles.z来判断哪种类型的Crawler
	if (z >= 45f && z <= 135f)
	{
	    type = CrawlerType.Wall;
	    velocity = new Vector2(0f, Mathf.Sign(-transform.localScale.x) * speed);
	}
	else if (z >= 135f && z <= 225f)
	{
	    type = ((transform.localScale.y > 0f) ? CrawlerType.Roof : CrawlerType.Floor);
	    velocity = new Vector2(Mathf.Sign(transform.localScale.x) * speed, 0f);
	}
	else if (z >= 225f && z <= 315f)
	{
	    type = CrawlerType.Wall;
	    velocity = new Vector2(0f, Mathf.Sign(transform.localScale.x) * speed);
	}
	else
	{
	    type = ((transform.localScale.y > 0f) ? CrawlerType.Floor : CrawlerType.Roof);
	    velocity = new Vector2(Mathf.Sign(-transform.localScale.x) * speed, 0f);
	}
	recoil.SetRecoilSpeed(0f);
	recoil.OnCancelRecoil += delegate()
	{
	    body.velocity = velocity;
	};
	CrawlerType crawlerType = type;
	if(crawlerType != CrawlerType.Floor)
	{
	    if(crawlerType - CrawlerType.Roof <= 1)
	    {
		body.gravityScale = 0;//如果在墙面面上rb2d的重力就设置为1
		recoil.freezeInPlace = true;	     
	    }
	}
	else
	{
	    body.gravityScale = 1; //如果在地面上rb2d的重力就设置为1
	    recoil.freezeInPlace = false;
	}
	StartCoroutine(nameof(Walk));
    }

    /// <summary>
    /// 使用协程实现Walk函数，循环直至hit=true后挂起然后启用协程Turn()
    /// </summary>
    /// <returns></returns>
    private IEnumerator Walk()
    {
	for(; ; )
	{
	    anim.Play("Walk");
	    body.velocity = velocity;
	    bool hit = false;
	    while (!hit)
	    {
		if(CheckRayLocal(wallCheck.localPosition,(transform.localScale.x > 0f )? Vector2.left : Vector2.right, 1f))
		{
		    hit = true;
		    break;
		}
		if (CheckRayLocal(groundCheck.localPosition, (transform.localScale.y > 0f) ? Vector2.down : Vector2.up, 1f))
		{
		    hit = true;
		    break;
		}
		yield return null;
	    }
	    yield return StartCoroutine(Turn());
	    yield return null;
	}
    }

    /// <summary>
    /// 使用协程实现转向函数
    /// </summary>
    /// <returns></returns>
    private IEnumerator Turn()
    {
	body.velocity = Vector2.zero;
	yield return StartCoroutine(anim.PlayAnimWait("Turn"));
	transform.SetScaleX(transform.localScale.x * -1f);
	velocity.x = velocity.x * -1f;
	velocity.y = velocity.y * -1f;
    }

    /// <summary>
    /// 发射射线，检测是否有LayerMask.GetMask("Terrain").collider
    /// </summary>
    /// <param name="originLocal"></param>
    /// <param name="directionLocal"></param>
    /// <param name="length"></param>
    /// <returns></returns>
    public bool CheckRayLocal(Vector3 originLocal, Vector2 directionLocal, float length)
    {
	Vector2 vector = transform.TransformPoint(originLocal);
	Vector2 vector2 = transform.TransformDirection(directionLocal);
	RaycastHit2D raycastHit2D = Physics2D.Raycast(vector, vector2, length, LayerMask.GetMask("Terrain"));
	Debug.DrawLine(vector, vector + vector2 * length);
	return raycastHit2D.collider != null;
    }

    private enum CrawlerType
    {
	Floor,
	Roof,
	Wall
    }
}

3.为小骑士添加后坐力行为  

    private int recoilSteps; 
    private float recoilTimer; //后坐力计时器
    private bool recoilLarge; //是否是更大的后坐力
    private Vector2 recoilVector; //后坐力二维上的速度

    public float RECOIL_HOR_VELOCITY; //后坐力X轴上的速度
    public float RECOIL_HOR_VELOCITY_LONG; //后坐力X轴上更大的速度
    public float RECOIL_DOWN_VELOCITY; //后坐力Y轴上的速度
    public float RECOIL_HOR_STEPS; //后坐力X轴的步
    public float RECOIL_DURATION; //后坐力持续时间
    public float RECOIL_VELOCITY; //后坐力时的速度(是两个轴上都适用的)

在HeroControllerState.cs中创建新的状态：

    public bool recoilFrozen;
    public bool recoiling;
    public bool recoilingLeft;
    public bool recoilingRight;

[Serializable]
public class HeroControllerStates
{
    public bool facingRight;
    public bool onGround;
    public bool wasOnGround;
    public bool attacking;
    public bool altAttack;
    public bool upAttacking;
    public bool downAttacking;
    public bool inWalkZone;
    public bool jumping;
    public bool falling;
    public bool dashing;
    public bool backDashing;
    public bool touchingWall;
    public bool wallSliding;
    public bool willHardLand;
    public bool recoilFrozen;
    public bool recoiling;
    public bool recoilingLeft;
    public bool recoilingRight;
    public bool dead;
    public bool hazardDeath;
    public bool invulnerable;
    public bool preventDash;
    public bool preventBackDash;
    public bool dashCooldown;
    public bool backDashCooldown;
    public bool isPaused;

    public HeroControllerStates()
    {
        facingRight = false;
        onGround = false;
        wasOnGround = false;
        attacking = false;
        altAttack = false;
        upAttacking = false;
        downAttacking = false;
        inWalkZone = false;
        jumping = false;
        falling = false;
        dashing = false;
        backDashing = false;
        touchingWall = false;
        wallSliding = false;
        willHardLand = false;
        recoilFrozen = false;
        recoiling = false;
        recoilingLeft = false;
        recoilingRight = false;
        dead = false;
        hazardDeath = false;
        invulnerable = false;
        preventDash = false;
        preventBackDash = false;
	    dashCooldown = false;
        backDashCooldown = false;
	    isPaused = false;
    }
}

在Update()函数中，如果hero_state == ActorStates.no_input，通过后坐力状态来切换是否要关闭后坐力行为，如果有输入了就取消进入recoiling状态

if (hero_state == ActorStates.no_input)
        {
	    if (cState.recoiling)
	    {
                if (recoilTimer < RECOIL_DURATION)
                {
                    recoilTimer += Time.deltaTime;
                }
                else
                {
                    CancelDamageRecoil();
                    if ((prev_hero_state == ActorStates.idle || prev_hero_state == ActorStates.running) && !CheckTouchingGround())
                    {
                        cState.onGround = false;
                        SetState(ActorStates.airborne);
                    }
		    else
		    {
                        SetState(ActorStates.previous);
		    }

                }
	    }
        }
else if (hero_state != ActorStates.no_input)
        {
            LookForInput();
	    if (cState.recoiling)
	    {
                cState.recoiling = false;
                AffectedByGravity(true);
	    }
            if(cState.attacking && !cState.dashing)
	    {
                attack_time += Time.deltaTime;
                if(attack_time >= attackDuration)
		{
                    ResetAttacks();
                    animCtrl.StopAttack();
		}
	    }
        }

 在FixedUpdate()中如果recoil步骤到达后就取消X轴上的后坐力CancelRecoilHorizonal：

    if(cState.recoilingLeft || cState.recoilingRight)
    {
            if(recoilSteps <= RECOIL_HOR_STEPS)
        {
                recoilSteps++;
        }
        else
        {
                CancelRecoilHorizonal();
        }
    }

还有判断后坐力时左边还是右边，以及是否开启recoilLarge来赋予 rb2d.velocity不同的速度：

 if(cState.recoilingLeft)
        {
                    float num;
                    if (recoilLarge)
                    {
                        num = RECOIL_HOR_VELOCITY_LONG;
                    }
                    else
                    {
                        num = RECOIL_HOR_VELOCITY;
                    }
                    if(rb2d.velocity.x > -num)
            {
                        rb2d.velocity = new Vector2(-num, rb2d.velocity.y);
            }
            else
            {
                        rb2d.velocity = new Vector2(rb2d.velocity.x - num, rb2d.velocity.y);
            }
        }
         if (cState.recoilingRight)
                {
                    float num2;
                    if(recoilLarge)
            {
                        num2 = RECOIL_HOR_VELOCITY_LONG;
            }
                    else
            {
                        num2 = RECOIL_HOR_VELOCITY;
                    }
                    if (rb2d.velocity.x < num2)
                    {
                        rb2d.velocity = new Vector2(num2, rb2d.velocity.y);
                    }
                    else
                    {
                        rb2d.velocity = new Vector2(rb2d.velocity.x + num2, rb2d.velocity.y);
                    }
                }

还需要添加几个新的后坐力函数：

public void RecoilLeft()
    {
        if(!cState.recoilingLeft && !cState.recoilingRight)
	{
            CancelDash();
            recoilSteps = 0;
            cState.recoilingLeft = true;
            cState.recoilingRight = false;
            recoilLarge = false;
            rb2d.velocity = new Vector2(-RECOIL_HOR_VELOCITY, rb2d.velocity.y);
	}
    }

    public void RecoilRight()
    {
        if (!cState.recoilingLeft && !cState.recoilingRight)
        {
            CancelDash();
            recoilSteps = 0;
            cState.recoilingLeft = false;
            cState.recoilingRight = true;
            recoilLarge = false;
            rb2d.velocity = new Vector2(RECOIL_HOR_VELOCITY, rb2d.velocity.y);
        }
    }

    public void RecoilLeftLong()
    {
        if (!cState.recoilingLeft && !cState.recoilingRight)
        {
            CancelDash();
            ResetAttacks();
            recoilSteps = 0;
            cState.recoilingLeft = true;
            cState.recoilingRight = false;
            recoilLarge = true;
            rb2d.velocity = new Vector2(-RECOIL_HOR_VELOCITY_LONG, rb2d.velocity.y);
        }
    }

    public void RecoilRightLong()
    {
        if (!cState.recoilingLeft && !cState.recoilingRight)
        {
            CancelDash();
            ResetAttacks();
            recoilSteps = 0;
            cState.recoilingLeft = false;
            cState.recoilingRight = true;
            recoilLarge = true;
            rb2d.velocity = new Vector2(RECOIL_HOR_VELOCITY_LONG, rb2d.velocity.y);
        }
    }

    public void RecoilDown()
    {
        CancelJump();
        if(rb2d.velocity.y > RECOIL_DOWN_VELOCITY)
	{
            rb2d.velocity = new Vector2(rb2d.velocity.x, RECOIL_DOWN_VELOCITY);
	}
    }

    public void CancelRecoilHorizonal()
    {
        cState.recoilingLeft = false;
        cState.recoilingRight = false;
        recoilSteps = 0;
    }

这里我为什么不贴完整的代码呢？因为其实小骑士的后坐力系统还和受伤系统有关系，所以我打算放到下面再完整的后坐力系统。

我们来个小骑士制作受伤动画和死亡动画和冻结动画吧。

老规矩，还是只添加偶数帧的sprite上去：这个是受伤Recoil动画

 这个是死亡Death动画：

最后是冻结Stun动画，是的它就一帧：

制作完动画后当然要来到我们最爱的HeroAnimationController.cs中：

if (actorStates == ActorStates.no_input)
    {
        if (cState.recoilFrozen)
        {
        Play("Stun");
        }
        else if (cState.recoiling)
        {
        Play("Recoil");
        }
    }

using System;
using GlobalEnums;
using UnityEngine;

public class HeroAnimationController : MonoBehaviour
{
    private HeroController heroCtrl;
    private HeroControllerStates cState;
    private tk2dSpriteAnimator animator;
    private PlayerData pd;

    private bool wasFacingRight;
    private bool playLanding;
    private bool playRunToIdle;//播放"Run To Idle"动画片段
    private bool playDashToIdle; //播放"Dash To Idle"动画片段
    private bool playBackDashToIdleEnd; //播放"Back Dash To Idle"动画片段(其实并不会播放)

    private bool changedClipFromLastFrame;

    public ActorStates actorStates { get; private set; }
    public ActorStates prevActorStates { get; private set; }

    private void Awake()
    {
	heroCtrl = HeroController.instance;
	cState = heroCtrl.cState;
	animator = GetComponent<tk2dSpriteAnimator>();
    }

    private void Start()
    {
	pd = PlayerData.instance;
	ResetAll();
	actorStates = heroCtrl.hero_state;

	if(heroCtrl.hero_state == ActorStates.airborne)
	{
	    animator.PlayFromFrame("Airborne", 7);
	    return;
	}
	PlayIdle();
    }

    private void Update()
    {
	UpdateAnimation();
	if (cState.facingRight)
	{
	    wasFacingRight = true;
	    return;
	}
	wasFacingRight = false;
    }

    private void UpdateAnimation()
    {
	changedClipFromLastFrame = false;
	if (playLanding)
	{
	    Play("Land");
	    animator.AnimationCompleted = new Action<tk2dSpriteAnimator, tk2dSpriteAnimationClip>(AnimationCompleteDelegate);
	    playLanding = false;
	}
	if (playRunToIdle)
	{
	    Play("Run To Idle");
	    animator.AnimationCompleted = new Action<tk2dSpriteAnimator, tk2dSpriteAnimationClip>(AnimationCompleteDelegate);
	    playRunToIdle = false;
	}
	if (playBackDashToIdleEnd)
	{
	    Play("Backdash Land 2");
	    //处理animation播放完成后的事件(其实并不会播放)
	    animator.AnimationCompleted = new Action<tk2dSpriteAnimator, tk2dSpriteAnimationClip>(AnimationCompleteDelegate);
	    playDashToIdle = false;
	}
	if (playDashToIdle)
	{
	    Play("Dash To Idle");
	    //处理animation播放完成后的事件
	    animator.AnimationCompleted = new Action<tk2dSpriteAnimator, tk2dSpriteAnimationClip>(AnimationCompleteDelegate);
	    playDashToIdle = false;
	}
	if (actorStates == ActorStates.no_input)
	{
	    //TODO:
	    if (cState.recoilFrozen)
	    {
		Play("Stun");
	    }
	    else if (cState.recoiling)
	    {
		Play("Recoil");
	    }
	}
	else if (cState.dashing)
	{
	    if (heroCtrl.dashingDown)
	    {
		Play("Dash Down");
	    }
	    else
	    {
		Play("Dash"); //通过cState.dashing判断是否播放Dash动画片段
	    }
	}
	else if (cState.backDashing)
	{
	    Play("Back Dash");
	}
	else if(cState.attacking)
	{
	    if (cState.upAttacking)
	    {
		Play("UpSlash");
	    }
	    else if (cState.downAttacking)
	    {
		Play("DownSlash");
	    }
	    else if (!cState.altAttack)
	    {
		Play("Slash");
	    }
	    else
	    {
		Play("SlashAlt");
	    }
	}
	else if (actorStates == ActorStates.idle)
	{
	    //TODO:
	    if (CanPlayIdle())
	    {
		PlayIdle();
	    }
	}
	else if (actorStates == ActorStates.running)
	{
	    if (!animator.IsPlaying("Turn"))
	    {
		if (cState.inWalkZone)
		{
		    if (!animator.IsPlaying("Walk"))
		    {
			Play("Walk");
		    }
		}
		else
		{
		    PlayRun();
		}
	    }
	}
	else if (actorStates == ActorStates.airborne)
	{
	    if (cState.jumping)
	    {
		if (!animator.IsPlaying("Airborne"))
		{
		    animator.PlayFromFrame("Airborne", 0);
		}
	    }
	    else if (cState.falling)
	    {
		if (!animator.IsPlaying("Airborne"))
		{
		    animator.PlayFromFrame("Airborne", 7);
		}
	    }
	    else if (!animator.IsPlaying("Airborne"))
	    {
		animator.PlayFromFrame("Airborne", 3);
	    }
	}
	//(其实并不会播放)
	else if (actorStates == ActorStates.dash_landing)
	{
	    animator.Play("Dash Down Land");
	}
	else if(actorStates == ActorStates.hard_landing)
	{
	    animator.Play("HardLand");
	}
	if (cState.facingRight)
	{
	    if(!wasFacingRight && cState.onGround && CanPlayTurn())
	    {
		Play("Turn");
	    }
	    wasFacingRight = true;
	}
	else
	{
	    if (wasFacingRight && cState.onGround && CanPlayTurn())
	    {
		Play("Turn");
	    }
	    wasFacingRight = false;
	}
	ResetPlays();
    }

    private void AnimationCompleteDelegate(tk2dSpriteAnimator anim, tk2dSpriteAnimationClip clip)
    {
	if(clip.name == "Land")
	{
	    PlayIdle();
	}
	if(clip.name == "Run To Idle")
	{
	    PlayIdle();
	}
	if(clip.name == "Backdash To Idle")//(其实并不会播放)
	{
	    PlayIdle();
	}
	if(clip.name == "Dash To Idle")
	{
	    PlayIdle();
	}
    }

    private void Play(string clipName)
    {
	if(clipName != animator.CurrentClip.name)
	{
	    changedClipFromLastFrame = true;
	}
	animator.Play(clipName);
    }

    private void PlayRun()
    {
	animator.Play("Run");
    }

    public void PlayIdle()
    {
	animator.Play("Idle");
    }

    public void StopAttack()
    {
	if(animator.IsPlaying("UpSlash") || animator.IsPlaying("DownSlash"))
	{
	    animator.Stop();
	}
    }

    public void FinishedDash()
    {
	playDashToIdle = true;
    }

    private void ResetAll()
    {
	playLanding = false;
	playRunToIdle = false;
	playDashToIdle = false;
	wasFacingRight = false;
    }

    private void ResetPlays()
    {
	playLanding = false;
	playRunToIdle = false;
	playDashToIdle = false;
    }

    public void UpdateState(ActorStates newState)
    {
	if(newState != actorStates)
	{
	    if(actorStates == ActorStates.airborne && newState == ActorStates.idle && !playLanding)
	    {
		playLanding = true;
	    }
	    if(actorStates == ActorStates.running && newState == ActorStates.idle && !playRunToIdle && !cState.inWalkZone)
	    {
		playRunToIdle = true;
	    }
	    prevActorStates = actorStates;
	    actorStates = newState;
	}
    }

    private bool CanPlayIdle()
    {
	return !animator.IsPlaying("Land") && !animator.IsPlaying("Run To Idle") && !animator.IsPlaying("Dash To Idle") && !animator.IsPlaying("Backdash Land") && !animator.IsPlaying("Backdash Land 2") && !animator.IsPlaying("LookUpEnd") && !animator.IsPlaying("LookDownEnd") && !animator.IsPlaying("Exit Door To Idle") && !animator.IsPlaying("Wake Up Ground") && !animator.IsPlaying("Hazard Respawn");
    }
    private bool CanPlayTurn()
    {
	return !animator.IsPlaying("Wake Up Ground") && !animator.IsPlaying("Hazard Respawn"); ;
    }

}

然后到HeroAudioController.cs添加一个新的AudioSource：

public AudioSource takeHit;

case HeroSounds.TAKE_HIT:
            takeHit.Play();
            break;

using System.Collections;
using System.Collections.Generic;
using GlobalEnums;
using UnityEngine;

public class HeroAudioController : MonoBehaviour
{
    private HeroController heroCtrl;

    private void Awake()
    {
	heroCtrl = GetComponent<HeroController>();
    }

    [Header("Sound Effects")]
    public AudioSource softLanding;
    public AudioSource hardLanding;
    public AudioSource jump;
    public AudioSource footStepsRun;
    public AudioSource footStepsWalk;
    public AudioSource falling;
    public AudioSource backDash;
    public AudioSource dash;
    public AudioSource takeHit;

    private Coroutine fallingCo;

    public void PlaySound(HeroSounds soundEffect)
    {
	if(!heroCtrl.cState.isPaused)
	{
	    switch (soundEffect)
	    {
		case HeroSounds.FOOTSETP_RUN:
		    if(!footStepsRun.isPlaying && !softLanding.isPlaying)
		    {
			footStepsRun.Play();
			return;
		    }
		    break;
		case HeroSounds.FOOTSTEP_WALK:
		    if (!footStepsWalk.isPlaying && !softLanding.isPlaying)
		    {
			footStepsWalk.Play();
			return;
		    }
		    break;
		case HeroSounds.SOFT_LANDING:
		    RandomizePitch(softLanding, 0.9f, 1.1f);
		    softLanding.Play();
		    break;
		case HeroSounds.HARD_LANDING:
		    hardLanding.Play();
		    break;
		case HeroSounds.JUMP:
		    RandomizePitch(jump, 0.9f, 1.1f);
		    jump.Play();
		    break;
		case HeroSounds.BACK_DASH:
		    backDash.Play();
		    break;
		case HeroSounds.DASH:
		    dash.Play();
		    break;
		case HeroSounds.TAKE_HIT:
		    takeHit.Play();
		    break;
		case HeroSounds.FALLING:
		    fallingCo = StartCoroutine(FadeInVolume(falling, 0.7f));
		    falling.Play();
		    break;
		default:
		    break;
	    }
	}
    }

    public void StopSound(HeroSounds soundEffect)
    {
	if(soundEffect == HeroSounds.FOOTSETP_RUN)
	{
	    footStepsRun.Stop();
	    return;
	}
	if (soundEffect == HeroSounds.FOOTSTEP_WALK)
	{
	    footStepsWalk.Stop();
	    return;
	}
	switch (soundEffect)
	{
	    case HeroSounds.FALLING:
		falling.Stop();
		if(fallingCo != null)
		{
		    StopCoroutine(fallingCo);
		}
		return;
	    default:
		return;
	}
    }

    public void StopAllSounds()
    {
	softLanding.Stop();
	hardLanding.Stop();
	jump.Stop();
	falling.Stop();
	backDash.Stop();
	dash.Stop();
	footStepsRun.Stop();
	footStepsWalk.Stop();
    }

    public void PauseAllSounds()
    {
	softLanding.Pause();
	hardLanding.Pause();
	jump.Pause();
	falling.Pause();
	backDash.Pause();
	dash.Pause();
	footStepsRun.Pause();
	footStepsWalk.Pause();
    }

    public void UnPauseAllSounds()
    {
	softLanding.UnPause();
	hardLanding.UnPause();
	jump.UnPause();
	falling.UnPause();
	backDash.UnPause();
	dash.UnPause();
	footStepsRun.UnPause();
	footStepsWalk.UnPause();
    }

    /// <summary>
    /// 音量淡入线性插值的从0到1
    /// </summary>
    /// <param name="src"></param>
    /// <param name="duration"></param>
    /// <returns></returns>
    private IEnumerator FadeInVolume(AudioSource src, float duration)
    {
	float elapsedTime = 0f;
	src.volume = 0f;
	while (elapsedTime < duration)
	{
	    elapsedTime += Time.deltaTime;
	    float t = elapsedTime / duration;
	    src.volume = Mathf.Lerp(0f, 1f, t);
	    yield return null;
	}
    }

    /// <summary>
    /// 随机旋转一个在和之间的pitch的值返回给audiosource
    /// </summary>
    /// <param name="src"></param>
    /// <param name="minPitch"></param>
    /// <param name="maxPitch"></param>
    private void RandomizePitch(AudioSource src, float minPitch, float maxPitch)
    {
	float pitch = Random.Range(minPitch, maxPitch);
	src.pitch = pitch;
    }

    /// <summary>
    /// 重置audiosource的pitch
    /// </summary>
    /// <param name="src"></param>
    private void ResetPitch(AudioSource src)
    {
	src.pitch = 1f;
    }

}

 如果报错了自然是在GlobalEnums中我们没有添加这个新的herosounds数组：

using System;

namespace GlobalEnums
{
    public enum ActorStates
    {
	grounded,
	idle,
	running,
	airborne,
	wall_sliding,
	hard_landing,
	dash_landing,
	no_input,
	previous
    }

    public enum AttackDirection
    {
	normal,
	upward,
	downward
    }

    public enum CollisionSide
    {
	top,
	left,
	right,
	bottom,
	other
    }

    public enum DamageMode
    {
	FULL_DAMAGE,
	HAZARD_ONLY,
	NO_DAMAGE
    }

    public enum HazardTypes
    {
	NON_HAZARD,
	SPIKES,
	ACID,
	LAVA,
	PIT
    }

    public enum HeroSounds
    {
	FOOTSETP_RUN,
	FOOTSTEP_WALK,
	SOFT_LANDING,
	HARD_LANDING,
	JUMP,
	BACK_DASH,
	DASH,
	FALLING,
	TAKE_HIT
    }

    public enum PhysLayers
    {
	DEFAULT,
	IGNORE_RAYCAST = 2,
	WATER = 4,
	UI,
	TERRAIN = 8,
	PLAYER,
	TRANSITION_GATES,
	ENEMIES,
	PROJECTILES,
	HERO_DETECTOR,
	TERRAIN_DETECTOR,
	ENEMY_DETECTOR,
	ITEM,
	HERO_ATTACK,
	PARTICLE,
	INTERACTIVE_OBJECT,
	HERO_BOX,
	BOUNCER = 24,
	SOFT_TERRAIN = 25
    }
}

 回到Unity编辑器中，在小骑士对应的脚本添加完新的AudioSource后，我们还要创建一个新的Layer就叫Hero Box，它用于专门处理和可交互物体（特别是敌人Enemy）的碰撞检测。

为小骑士新建一个子对象就叫HeroBox，把刚刚创建的Layer放上去，然后设置你觉得合适的碰撞大小：

创建一个同名脚本HeroBox.cs:

using System;
using GlobalEnums;
using UnityEngine;

public class HeroBox : MonoBehaviour
{
    public static bool inactive;
    private HeroController heroCtrl;
    private GameObject damagingObject;
    private bool isHitBuffered;
    private int damageDealt;
    private int hazardType;
    private CollisionSide collisionSide;

    private void Start()
    {
	    heroCtrl = HeroController.instance;
    }

    private void LateUpdate()
    {
	if (isHitBuffered)
	{
	    ApplyBufferedHit();
	}
    }

    private void OnTriggerEnter2D(Collider2D otherCollider)
    {
	    if (!inactive)
	    {
	        CheckForDamage(otherCollider);
	    }
    }

    private void OnTriggerStay2D(Collider2D otherCollider)
    {
	    if (!inactive)
	    {
	        CheckForDamage(otherCollider);
	    }
    }

    /// <summary>
    /// 通过两种方法检测受到伤害的方法
    /// 一种是通过otherCollider.gameObject中是否有一个名字叫"damages_hero"的playmakerFSM
    /// 另一种是通过otherCollider.gameObject是否有个叫DamageHero的脚本
    /// </summary>
    /// <param name="otherCollider"></param>
    private void CheckForDamage(Collider2D otherCollider)
    {
	if (!FSMUtility.ContainsFSM(otherCollider.gameObject, "damages_hero"))
	{
	    DamageHero component = otherCollider.gameObject.GetComponent<DamageHero>();
	    if (component != null)
	    {

		damageDealt = component.damageDealt;
		hazardType = component.hazardType;
		damagingObject = otherCollider.gameObject;
		collisionSide = ((damagingObject.transform.position.x > transform.position.x) ? CollisionSide.right : CollisionSide.left);
		if (!IsHitTypeBuffered(hazardType))
		{
		    ApplyBufferedHit();
		    return;
		}
		isHitBuffered = true;
	    }
	    return;
	}
	PlayMakerFSM fsm = FSMUtility.LocateFSM(otherCollider.gameObject, "damages_hero");
	int dealt = FSMUtility.GetInt(fsm, "damageDealt");
	int type = FSMUtility.GetInt(fsm, "hazardType");
	if (otherCollider.transform.position.x > transform.position.x)
	{
	    heroCtrl.TakeDamage(otherCollider.gameObject, CollisionSide.right, dealt, type);
	    return;
	}
	heroCtrl.TakeDamage(otherCollider.gameObject, CollisionSide.left, dealt, type);
    }

    public static bool IsHitTypeBuffered(int hazardType)
    {
	return hazardType == 0;
    }

    /// <summary>
    /// 应用缓冲后受击，就是执行HeroController的TakeDamage方法
    /// </summary>
    private void ApplyBufferedHit()
    {
	    heroCtrl.TakeDamage(damagingObject, collisionSide, damageDealt, hazardType);
	    isHitBuffered = false;
    }


}

 我们先为每一个敌人添加一个新的脚本叫DamageHero.cs:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class DamageHero : MonoBehaviour
{
    public int damageDealt = 1;
    public int hazardType = 1;
    public bool shadowDashHazard;
    public bool resetOnEnable;
    private int? initialValue;

    private void OnEnable()
    {
	if (resetOnEnable)
	{
	    if(initialValue == null)
	    {
		initialValue = new int?(damageDealt);
		return;
	    }
	    damageDealt = initialValue.Value;
	}
    }
}

回到HealthManager.cs中，如果执行Die（）函数后就把damageHero里面的damageDealt设置为0

private DamageHero damageHero;

damageHero = GetComponent<DamageHero>();

if(damageHero != null)
    {
        damageHero.damageDealt = 0;
    }

完整的代码如下：

using System;
using System.Collections;
using HutongGames.PlayMaker;
using UnityEngine;
using UnityEngine.Audio;

public class HealthManager : MonoBehaviour, IHitResponder
{
    private BoxCollider2D boxCollider;
    private IHitEffectReciever hitEffectReceiver;
    private Recoil recoil;
    private tk2dSpriteAnimator animator;
    private tk2dSprite sprite;
    private DamageHero damageHero;

    [Header("Asset")]
    [SerializeField] private AudioSource audioPlayerPrefab; //声音播放器预制体

    [Header("Body")]
    [SerializeField] public int hp; //血量
    [SerializeField] public int enemyType; //敌人类型
    [SerializeField] private Vector3 effectOrigin; //生效偏移量

    public bool isDead;

    private int directionOfLastAttack; //最后一次受到攻击的方向
    private float evasionByHitRemaining; //剩余攻击下的逃避时间
    private const string CheckPersistenceKey = "CheckPersistence";

    public delegate void DeathEvent();
    public event DeathEvent OnDeath;

    protected void Awake()
    {
	boxCollider = GetComponent<BoxCollider2D>();
	hitEffectReceiver = GetComponent<IHitEffectReciever>();
	recoil = GetComponent<Recoil>();
	animator = GetComponent<tk2dSpriteAnimator>();
	sprite = GetComponent<tk2dSprite>();
	damageHero = GetComponent<DamageHero>();
    }

    protected void OnEnable()
    {
	StartCoroutine(CheckPersistenceKey);
    }

    protected void Start()
    {
	evasionByHitRemaining = -1f;
    }

    protected void Update()
    {
	evasionByHitRemaining -= Time.deltaTime;
    }

    public void Hit(HitInstance hitInstance)
    {
	if (isDead)
	{
	    return;
	}
	if(evasionByHitRemaining > 0f) 
	{ 
	    return;
	}
	if(hitInstance.DamageDealt < 0f)
	{
	    return;
	}
	FSMUtility.SendEventToGameObject(hitInstance.Source, "DEALT DAMAGE", false);
	int cardinalDirection = DirectionUtils.GetCardinalDirection(hitInstance.GetActualDirection(transform));
	if (IsBlockingByDirection(cardinalDirection, hitInstance.AttackType))
	{
	    Invincible(hitInstance);
	    return;
	}
	TakeDamage(hitInstance);
    }

    private void Invincible(HitInstance hitInstance)
    {
	int cardinalDirection = DirectionUtils.GetCardinalDirection(hitInstance.GetActualDirection(transform));
	directionOfLastAttack = cardinalDirection;
	FSMUtility.SendEventToGameObject(gameObject, "BLOCKED HIT", false);
	FSMUtility.SendEventToGameObject(hitInstance.Source, "HIT LANDED", false);
	if (!(GetComponent<DontClinkGates>() != null))
	{
	    FSMUtility.SendEventToGameObject(gameObject, "HIT", false);

	    if(hitInstance.AttackType == AttackTypes.Nail)
	    {
		if(cardinalDirection == 0)
		{
		    HeroController.instance.RecoilLeft();
		}
		else if(cardinalDirection == 2)
		{
		    HeroController.instance.RecoilRight();
		}
	    }

	    Vector2 v;
	    Vector3 eulerAngles;
	    if (boxCollider != null)
	    {
		switch (cardinalDirection)
		{
		    case 0:
			v = new Vector2(transform.GetPositionX() + boxCollider.offset.x - boxCollider.size.x * 0.5f, hitInstance.Source.transform.GetPositionY());
			eulerAngles = new Vector3(0f, 0f, 0f);
			break;
		    case 1:
			v = new Vector2(hitInstance.Source.transform.GetPositionX(), Mathf.Max(hitInstance.Source.transform.GetPositionY(), transform.GetPositionY() + boxCollider.offset.y - boxCollider.size.y * 0.5f));
			eulerAngles = new Vector3(0f, 0f, 90f);
			break;
		    case 2:
			v = new Vector2(transform.GetPositionX() + boxCollider.offset.x + boxCollider.size.x * 0.5f, hitInstance.Source.transform.GetPositionY());
			eulerAngles = new Vector3(0f, 0f, 180f);
			break;
		    case 3:
			v = new Vector2(hitInstance.Source.transform.GetPositionX(), Mathf.Min(hitInstance.Source.transform.GetPositionY(), transform.GetPositionY() + boxCollider.offset.y + boxCollider.size.y * 0.5f));
			eulerAngles = new Vector3(0f, 0f, 270f);
			break;
		    default:
			break;
		}
	    }
	    else
	    {
		v = transform.position;
		eulerAngles = new Vector3(0f, 0f, 0f);
	    }
	}
	evasionByHitRemaining = 0.15f;
    }

    public void TakeDamage(HitInstance hitInstance)
    {
	Debug.LogFormat("Enemy Take Damage");
	int cardinalDirection = DirectionUtils.GetCardinalDirection(hitInstance.GetActualDirection(transform));
	directionOfLastAttack = cardinalDirection;
	FSMUtility.SendEventToGameObject(gameObject, "HIT", false);
	FSMUtility.SendEventToGameObject(hitInstance.Source, "HIT LANDED", false);
	FSMUtility.SendEventToGameObject(gameObject, "TOOK DAMAGE", false);
	if(recoil != null)
	{
	    recoil.RecoilByDirection(cardinalDirection,hitInstance.MagnitudeMultiplier);
	}
	switch (hitInstance.AttackType)
	{
	    case AttackTypes.Nail:
		if(hitInstance.AttackType == AttackTypes.Nail && enemyType !=3 && enemyType != 6)
		{

		}
		Vector3 position = (hitInstance.Source.transform.position + transform.position) * 0.5f + effectOrigin;
		break;
	    case AttackTypes.Generic:
		break;
	    default:
		break;
	}
	if(hitEffectReceiver != null)
	{
	    hitEffectReceiver.ReceiverHitEffect(hitInstance.GetActualDirection(transform));
	}
	int num = Mathf.RoundToInt((float)hitInstance.DamageDealt * hitInstance.Multiplier);

	hp = Mathf.Max(hp - num, -50);
	if(hp > 0)
	{

	}
	else
	{
	    Die(new float?(hitInstance.GetActualDirection(transform)), hitInstance.AttackType, hitInstance.IgnoreInvulnerable);
	}
    }

    public void Die(float? v, AttackTypes attackType, bool ignoreInvulnerable)
    {
	if (isDead)
	{
	    return;
	}
	if (sprite)
	{
	    sprite.color = Color.white;
	}
	FSMUtility.SendEventToGameObject(gameObject, "ZERO HP", false);
	isDead = true;
	if(damageHero != null)
	{
	    damageHero.damageDealt = 0;
	}
	SendDeathEvent();
	Destroy(gameObject); //TODO:
    }

    public void SendDeathEvent()
    {
	if (OnDeath != null)
	{
	    OnDeath();
	}
    }

    public bool IsBlockingByDirection(int cardinalDirection,AttackTypes attackType)
    {

	switch (cardinalDirection)
	{

	    default:
		return false;
	}

    }

    protected IEnumerator CheckPersistence()
    {
	yield return null;
	if (isDead)
	{
	    gameObject.SetActive(false);
	}
	yield break;
    }

}

 然后为FSMUtility添加几个新的静态方法：

using System;
using System.Collections.Generic;
using HutongGames.PlayMaker;
using UnityEngine;

public static class FSMUtility
{
    private static List<List<PlayMakerFSM>> fsmListPool;
    private const int FsmListPoolSizeMax = 20;

    static FSMUtility()
    {
	fsmListPool = new List<List<PlayMakerFSM>>();
    }

    public static PlayMakerFSM LocateFSM(GameObject go, string fsmName)
    {
	if (go == null)
	{
	    return null;
	}
	List<PlayMakerFSM> list = ObtainFsmList();
	go.GetComponents<PlayMakerFSM>(list);
	PlayMakerFSM result = null;
	for (int i = 0; i < list.Count; i++)
	{
	    PlayMakerFSM playMakerFSM = list[i];
	    if (playMakerFSM.FsmName == fsmName)
	    {
		result = playMakerFSM;
		break;
	    }
	}
	ReleaseFsmList(list);
	return result;
    }

    private static List<PlayMakerFSM> ObtainFsmList()
    {
	if (fsmListPool.Count > 0)
	{
	    List<PlayMakerFSM> result = fsmListPool[fsmListPool.Count - 1];
	    fsmListPool.RemoveAt(fsmListPool.Count - 1);
	    return result;
	}
	return new List<PlayMakerFSM>();
    }

    public static bool ContainsFSM(GameObject go, string fsmName)
    {
	if (go == null)
	{
	    return false;
	}
	List<PlayMakerFSM> list = FSMUtility.ObtainFsmList();
	go.GetComponents<PlayMakerFSM>(list);
	bool result = false;
	for (int i = 0; i < list.Count; i++)
	{
	    if (list[i].FsmName == fsmName)
	    {
		result = true;
		break;
	    }
	}
	FSMUtility.ReleaseFsmList(list);
	return result;
    }

    public static int GetInt(PlayMakerFSM fsm, string variableName)
    {
	return fsm.FsmVariables.FindFsmInt(variableName).Value;
    }

    private static void ReleaseFsmList(List<PlayMakerFSM> fsmList)
    {
	fsmList.Clear();
	if (fsmListPool.Count < FsmListPoolSizeMax)
	{
	    fsmListPool.Add(fsmList);
	}
    }

    public static PlayMakerFSM GetFSM(GameObject go)
    {
	return go.GetComponent<PlayMakerFSM>();
    }

    public static GameObject GetSafe(this FsmOwnerDefault ownerDefault, FsmStateAction stateAction)
    {
	if (ownerDefault.OwnerOption == OwnerDefaultOption.UseOwner)
	{
	    return stateAction.Owner;
	}
	return ownerDefault.GameObject.Value;
    }

    public static void SendEventToGameObject(GameObject go, string eventName, bool isRecursive = false)
    {
	if (go != null)
	{
	    SendEventToGameObject(go, FsmEvent.FindEvent(eventName), isRecursive);
	}
    }

    public static void SendEventToGameObject(GameObject go, FsmEvent ev, bool isRecursive = false)
    {
	if (go != null)
	{
	    List<PlayMakerFSM> list = ObtainFsmList();
	    go.GetComponents<PlayMakerFSM>(list);
	    for (int i = 0; i < list.Count; i++)
	    {
		list[i].Fsm.Event(ev);
	    }
	    ReleaseFsmList(list);
	    if (isRecursive)
	    {
		Transform transform = go.transform;
		for (int j = 0; j < transform.childCount; j++)
		{
		    SendEventToGameObject(transform.GetChild(j).gameObject, ev, isRecursive);
		}
	    }
	}
    }

}

回到HeroController.cs处理报错的部分： 我们新生成一个方法就叫做TakeDamage():

private bool CanTakeDamage()
    {
        return damageMode != DamageMode.NO_DAMAGE && !cState.invulnerable && !cState.recoiling && !cState.dead;
    }

    public void TakeDamage(GameObject go,CollisionSide damageSide,int damageAmount,int hazardType)
    {
        bool spawnDamageEffect = true;
        if (damageAmount > 0)
        {
            if (CanTakeDamage())
            {
                if (damageMode == DamageMode.HAZARD_ONLY && hazardType == 1)
                {
                    return;
                }
                if (parryInvulnTimer > 0f && hazardType == 1)
                {
                    return;
                }

                proxyFSM.SendEvent("HeroCtrl-HeroDamaged");
                CancelAttack();

                if (cState.touchingWall)
                {
                    cState.touchingWall = false;
                }
                if (cState.recoilingLeft || cState.recoilingRight)
                {
                    CancelRecoilHorizonal();
                }
                audioCtrl.PlaySound(HeroSounds.TAKE_HIT);
                if (!takeNoDamage)
                {
                    playerData.TakeHealth(damageAmount);
                }

                if (damageAmount > 0 && OnTakenDamage != null)
                {
                    OnTakenDamage();
                }
                if (playerData.health == 0)
                {
                    StartCoroutine(Die());
                    return;
                }
                if (hazardType == 2)
                {
                    Debug.LogFormat("Die From Spikes");
                    return;
                }
                if (hazardType == 3)
                {
                    Debug.LogFormat("Die From Acid");
                    return;
                }
                if (hazardType == 4)
                {
                    Debug.LogFormat("Die From Lava");
                    return;
                }
                if (hazardType == 5)
                {
                    Debug.LogFormat("Die From Pit");
                    return;
                }
                StartCoroutine(StartRecoil(damageSide, spawnDamageEffect, damageAmount));
                return;
            }
            else if (cState.invulnerable && !cState.hazardDeath)
	    {
                if(hazardType == 2)
		{
		    if (!takeNoDamage)
		    {
                        playerData.TakeHealth(damageAmount);
		    }
                    proxyFSM.SendEvent("HeroCtrl-HeroDamaged");
                    if(playerData.health == 0)
		    {
                        StartCoroutine(Die());
                        return;
		    }
                    audioCtrl.PlaySound(HeroSounds.TAKE_HIT);
                    StartCoroutine(DieFromHazard(HazardTypes.SPIKES, (go != null) ? go.transform.rotation.z : 0f));
                    return;
		}
                else if (hazardType == 3)
                {             
                    playerData.TakeHealth(damageAmount);
                    proxyFSM.SendEvent("HeroCtrl-HeroDamaged");
                    if (playerData.health == 0)
                    {
                        StartCoroutine(Die());
                        return;
                    }
                    audioCtrl.PlaySound(HeroSounds.TAKE_HIT);
                    StartCoroutine(DieFromHazard(HazardTypes.ACID, 0f));
                    return;
                }
                else if(hazardType == 4)
		{
                    Debug.LogFormat("Die From Lava");
                }
            }
	}
    }

我们还要一些新的受伤事件和变量要做：

    public delegate void TakeDamageEvent();
    public event TakeDamageEvent OnTakenDamage;
    public delegate void OnDeathEvent();
    public event OnDeathEvent OnDeath;

    public bool takeNoDamage; //不受到伤害
    public PlayMakerFSM damageEffectFSM; //负责的受伤效果playmakerFSM
    public DamageMode damageMode; //受伤类型
    private Coroutine takeDamageCoroutine; //受伤协程
    private float parryInvulnTimer;  //无敌时间
    public float INVUL_TIME;//无敌时间

    public float DAMAGE_FREEZE_DOWN;  //受伤冻结的上半程时间
    public float DAMAGE_FREEZE_WAIT; //受伤冻结切换的时间
    public float DAMAGE_FREEZE_UP;//受伤冻结的下半程时间

 来到PlayerData.cs中，我们需要创建几个新的变量，包括玩家的血量，是否阻止暂停（暂时用不上）public bool disablePause;

扣血函数：

public void TakeHealth(int amount)
    {
    if(amount > 0 && health == maxHealth && health != CurrentMaxHealth)
    {
        health = CurrentMaxHealth;
    }
    if(health - amount < 0)
    {
        health = 0;
        return;
    }
    health -= amount;
    }

using System;
using System.Collections.Generic;
using System.Reflection;
using GlobalEnums;
using UnityEngine;

[Serializable]
public class PlayerData
{
    private static PlayerData _instance;
    public static PlayerData instance
    {
	get
	{
	    if(_instance == null)
	    {
		_instance = new PlayerData();
	    }
	    return _instance;
	}
	set
	{
	    _instance = value;
	}
    }

    public bool disablePause;

    public int health;
    public int maxHealth;
    public int maxHealthBase;
    public int nailDamage;

    public bool hasDash;
    public bool canDash;
    public bool hasBackDash;
    public bool canBackDash;

    public bool overcharmed;
    public bool gotCharm_31;
    public bool equippedCharm_31;

    public int CurrentMaxHealth
    {
	get
	{
	    return maxHealth;
	}
    }


    protected PlayerData()
    {
	SetupNewPlayerData();
    }

    public void Reset()
    {
	SetupNewPlayerData();
    }

    private void SetupNewPlayerData()
    {
	disablePause = false;

	health = 5;
	maxHealth = 5;
	maxHealthBase = 5;
	nailDamage = 5;

	hasDash = true; //测试阶段先设置为true方便测试
	canDash = true;
	hasBackDash = false;
	canBackDash = false;

	overcharmed = false;
	gotCharm_31 = true;
	equippedCharm_31 = true;
    }

    public void TakeHealth(int amount)
    {
	if(amount > 0 && health == maxHealth && health != CurrentMaxHealth)
	{
	    health = CurrentMaxHealth;
	}
	if(health - amount < 0)
	{
	    health = 0;
	    return;
	}
	health -= amount;
    }
    public int GetInt(string intName)
    {
	if (string.IsNullOrEmpty(intName))
	{
	    Debug.LogError("PlayerData: Int with an EMPTY name requested.");
	    return -9999;
	}
	FieldInfo fieldInfo = GetType().GetField(intName);
	if(fieldInfo != null)
	{
	    return (int)fieldInfo.GetValue(instance);
	}
	Debug.LogError("PlayerData: Could not find int named " + intName + " in PlayerData");
	return -9999;
    }

    public bool GetBool(string boolName)
    {
	if (string.IsNullOrEmpty(boolName))
	{
	    return false;
	}
	FieldInfo field = GetType().GetField(boolName);
	if (field != null)
	{
	    return (bool)field.GetValue(instance);
	}
	Debug.Log("PlayerData: Could not find bool named " + boolName + " in PlayerData");
	return false;
    }

}

来到GameManager，我们创建一个新的协程FreezeMoment目的是设置新的TimeScale，而且它是分阶段的，从先到慢的 TimeScale再回到一般的TimeScale，功能很强大！

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class GameManager : MonoBehaviour
{
    private int timeSlowedCount;

    public bool TimeSlowed
    {
	get
	{
	    return timeSlowedCount > 0;
	}
    }

    [SerializeField] public PlayerData playerData;

    private static GameManager _instance;
    public static GameManager instance
    {
	get
	{
	    if(_instance == null)
	    {
		_instance = FindObjectOfType<GameManager>();
	    }
	    if (_instance == null)
	    {
		Debug.LogError("Couldn't find a Game Manager, make sure one exists in the scene.");
	    }
	    else if (Application.isPlaying)
	    {
		DontDestroyOnLoad(_instance.gameObject);
	    }
	    return _instance;
	}
    }

    private void Awake()
    {
	if(_instance != this)
	{
	    _instance = this;
	    DontDestroyOnLoad(this);
	    SetupGameRefs();
	    return;
	}
	if(this != _instance)
	{
	    Destroy(gameObject);
	    return;
	}
	SetupGameRefs();
    }

    private void SetupGameRefs()
    {
	playerData = PlayerData.instance;
    }

    public int GetPlayerDataInt(string intName)
    {
	return playerData.GetInt(intName);
    }

    public bool GetPlayerDataBool(string boolName)
    {
	return playerData.GetBool(boolName);
    }

    private IEnumerator SetTimeScale(float newTimeScale,float duration)
    {
	float lastTimeScale = TimeController.GenericTimeScale;
	for (float timer = 0f; timer < duration; timer += Time.unscaledDeltaTime)
	{
	    float t = Mathf.Clamp01(timer / duration);
	    SetTimeScale(Mathf.Lerp(lastTimeScale, newTimeScale, t));
	    yield return null;
	}
	SetTimeScale(newTimeScale);
    }

    private void SetTimeScale(float newTimeScale)
    {
	if(timeSlowedCount > 1)
	{
	    newTimeScale = Mathf.Min(newTimeScale, TimeController.GenericTimeScale);
	}
	TimeController.GenericTimeScale = ((newTimeScale > 0.01f) ? newTimeScale : 0f);
    }

    public IEnumerator FreezeMoment(float rampDownTime,float waitTime,float rampUpTime,float targetSpeed)
    {
	timeSlowedCount++;
	yield return StartCoroutine(SetTimeScale(targetSpeed, rampDownTime));
	for (float timer = 0f; timer < waitTime; timer += Time.unscaledDeltaTime)
	{
	    yield return null;
	}
	yield return StartCoroutine(SetTimeScale(1f, rampUpTime));
	timeSlowedCount--;
    }
}

还需要新建一个新的静态类用过管理当前场景中的TimeScale，我们就叫他：TimeController：

using System;
using UnityEngine;

public static class TimeController
{
    private static float slowMotionTimeScale = 1f;
    private static float pauseTimeScale = 1f;
    private static float platformBackgroundTimeScale = 1f;
    private static float genericTimeScale = 1f;
    public static float GenericTimeScale
    {
	get
	{
	    return genericTimeScale;
	}
	set
	{
	    SetTimeScaleFactor(ref genericTimeScale, value);
	}
    }

    private static void SetTimeScaleFactor(ref float field, float val)
    {
	if (field != val)
	{
	    field = val;
	    float num = slowMotionTimeScale * pauseTimeScale * platformBackgroundTimeScale * genericTimeScale;
	    if (num < 0.01f)
	    {
		num = 0f;
	    }
	    Time.timeScale = num;
	}
    }
}

 回到HeroController.cs中，我们来制作无敌状态的方法（）

private IEnumerator Invulnerable(float duration)
    {
        cState.invulnerable = true;
        yield return new WaitForSeconds(DAMAGE_FREEZE_DOWN);
        invPulse.StartInvulnerablePulse();
        yield return new WaitForSeconds(duration);
        invPulse.StopInvulnerablePulse();
        cState.invulnerable = false;
        cState.recoiling = false;
    }

这个invPulse用来制作无敌颜色和通常颜色的线性差值的变化

using System;
using UnityEngine;

public class InvulnerablePulse : MonoBehaviour
{
    public Color invulColor;
    public float pulseDuration;
    private Color normalColor;
    private tk2dSprite sprite;
    private bool pulsing;
    private bool reverse;
    private float currentLerpTime;

    private void Start()
    {
	sprite = GetComponent<tk2dSprite>();
	normalColor = sprite.color;
	pulsing = false;
	currentLerpTime = 0f;
    }

    private void Update()
    {
	if (pulsing)
	{
	    if (!reverse)
	    {
		currentLerpTime += Time.deltaTime;
		if(currentLerpTime > pulseDuration)
		{
		    currentLerpTime = pulseDuration;
		    reverse = true;
		}
	    }
	    else
	    {
		currentLerpTime -= Time.deltaTime;
		if(currentLerpTime < 0f)
		{
		    currentLerpTime = 0f;
		    reverse = false;
		}
	    }
	    float t = currentLerpTime / pulseDuration;
	    sprite.color = Color.Lerp(normalColor, invulColor, t);
	}
    }

    public void StartInvulnerablePulse()
    {
	pulsing = true;
	currentLerpTime = 0f;
    }

    public void StopInvulnerablePulse()
    {
	pulsing = false;
	UpdateSpriteColor(normalColor);
	currentLerpTime = 0f;
    }

    public void UpdateSpriteColor(Color color)
    {
	sprite.color = color;
    }

}

而死亡函数和致命死亡函数仅仅是开始阶段，我们暂时只是将renderer.enabled = false;所以死亡动画什么的要到后面才能做到。 

 private IEnumerator Die()
    {
	if (OnDeath != null)
	{
            OnDeath();
	}
	if (!cState.dead)
	{
            playerData.disablePause = true;

            rb2d.velocity = Vector2.zero;
            CancelRecoilHorizonal();

            AffectedByGravity(false);
            HeroBox.inactive = true;
            rb2d.isKinematic = true;
            SetState(ActorStates.no_input);
            cState.dead = true;
            ResetMotion();
            ResetHardLandingTimer();
            renderer.enabled = false;
            gameObject.layer = 2;

            yield return null;

	}
    }

    private IEnumerator DieFromHazard(HazardTypes hazardType,float angle)
    {
	if (!cState.hazardDeath)
	{
            playerData.disablePause = true;

            SetHeroParent(null);
            SetState(ActorStates.no_input);
            cState.hazardDeath = true;
            ResetMotion();
            ResetHardLandingTimer();
            AffectedByGravity(false);
            renderer.enabled = false;
            gameObject.layer = 2;
            if(hazardType == HazardTypes.SPIKES)
	    {

	    }
            else if(hazardType == HazardTypes.ACID)
	    {

	    }
            yield return null;

	}
    }

最后我们来到Unity编辑器中，首先我们先来更改每一种Slash里面的PlayerMakerFSM的变量叫magnitudeMult的值都设置为1。 

 为Knight制作一个新的playmakerFSM叫proxyFSM：

这里有一个新的自定义行为叫SendEventToRegister.cs:

using System;
using HutongGames.PlayMaker;

[ActionCategory("Hollow Knight")]
public class SendEventToRegister : FsmStateAction
{
    public FsmString eventName;

    public override void Reset()
    {
	eventName = new FsmString();
    }

    public override void OnEnter()
    {
	if(eventName.Value != "")
	{
	    EventRegister.SendEvent(eventName.Value);
	}
	base.Finish();
    }
}

 我们再给小骑士添加一个新的脚本叫EventRegister.cs：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class EventRegister : MonoBehaviour
{
    public static Dictionary<string, List<EventRegister>> eventRegister = new Dictionary<string, List<EventRegister>>();
    [SerializeField] public string subscribedEvent = "";

    public delegate void RegisteredEvent();
    public event RegisteredEvent OnReceivedEvent;

    private void Awake()
    {
	SubscribeEvent(this);
    }

    private void OnDestroy()
    {
	UnsubscribeEvent(this);
    }

    public static void SendEvent(string eventName)
    {
	if (eventName == "")
	{
	    return;
	}
	if (eventRegister.ContainsKey(eventName))
	{
	    foreach (EventRegister eventRegister in eventRegister[eventName])
	    {
		eventRegister.ReceiveEvent();
	    }
	}
    }

    public void ReceiveEvent()
    {
	FSMUtility.SendEventToGameObject(gameObject, this.subscribedEvent, false);
	if (this.OnReceivedEvent != null)
	{
	    this.OnReceivedEvent();
	}
    }

    public static void SubscribeEvent(EventRegister register)
    {
	string key = register.subscribedEvent;
	List<EventRegister> list;
	if (eventRegister.ContainsKey(key))
	{
	    list = eventRegister[key];
	}
	else
	{
	    list = new List<EventRegister>();
	    eventRegister.Add(key, list);
	}
	list.Add(register);
    }

    public static void UnsubscribeEvent(EventRegister register)
    {
	string key = register.subscribedEvent;
	if (eventRegister.ContainsKey(key))
	{
	    List<EventRegister> list = eventRegister[key];
	    if (list.Contains(register))
	    {
		list.Remove(register);
	    }
	    if (list.Count <= 0)
	    {
		eventRegister.Remove(key);
	    }
	}
    }

}

我们在小骑士的子对象Effects，给它添加一个新的子对象叫Damage Effect，用来制作受伤系统的效果：

首先从Leak开始介绍：

另一个粒子系统Hit Pt 1:

 另一个粒子系统Hit Pt 2只需要改变Transform即可:

Hit Crack：这个tk2dSprite和tk2dSpriteAnimation我感觉你们都会做了就不细说了

 然后是只剩一滴血的时候的Damage Effects:

 这个low health hit我使用animator制作的，你也可以使用tk2dSpriteAnimator来制作：

 然后是另一个粒子系统black particle burst：

为Hit Crack添加新的Playermaker FSM：简单，只需要把Wait的Time和动画的Clip Time的时间设置成相等即可

 low health hit effect也同理：

然给Damage Effect添加一个名字叫Knight Damage 的playmakerFSM：

事件如上，变量如下，特殊处理的变量的图片我都放出来了：

 每一种状态如下所示：

这里也需要一个新的自定义行为PlayerDataBoolTest .cs：

using UnityEngine;

namespace HutongGames.PlayMaker.Actions
{

    [ActionCategory(ActionCategory.Logic)]
    [Tooltip("Sends Events based on the value of a Boolean Variable.")]
    public class PlayerDataBoolTest : FsmStateAction
	{
	[RequiredField]
	[Tooltip("GameManager reference, set this to the global variable GameManager.")]
	public FsmOwnerDefault gameObject;

	[RequiredField]
	public FsmString boolName;

	[Tooltip("Event to send if the Bool variable is True.")]
	public FsmEvent isTrue;

	[Tooltip("Event to send if the Bool variable is False.")]
	public FsmEvent isFalse;

	private bool boolCheck;

	public override void Reset()
	{
	    gameObject = null;
	    boolName = null;
	    isTrue = null;
	    isFalse = null;
	}

	public override void OnEnter()
	{
	    GameObject ownerDefaultTarget = Fsm.GetOwnerDefaultTarget(gameObject);
	    if (ownerDefaultTarget == null)
	    {
		return;
	    }
	    GameManager component = ownerDefaultTarget.GetComponent<GameManager>();
	    if (component == null)
	    {
		return;
	    }
	    boolCheck = component.GetPlayerDataBool(boolName.Value);
	    if (boolCheck)
	    {
		Fsm.Event(isTrue);
	    }
	    else
	    {
		Fsm.Event(isFalse);
	    }
	    Finish();
	}


    }

}