简单血条于小怪攻击模板

创建一个2d正方形（9-Sliced）命名为Player，在Player下面新建一个画布（Canvas）命名为PlayerHealthUI，在画布下面新建一个滑动条（Slider）命名为HealthBar

把PlayerHealthUI脚本挂载到PlayerHealthUI上，拖拽情况如图所示

using UnityEngine;
using UnityEngine.UI;public class PlayerHealthUI : MonoBehaviour
{[SerializeField] private Slider healthBar;[SerializeField] private Health health;//更新血条方法（注意要写成公有的）public void UpdateUI(){healthBar.value = health.Value;}//进入游戏的时候开启private void Awake(){//起始值：血条UI的起始值=health的初始值healthBar.maxValue = health.Value;//更新：血条UI的现在值=health的初始值healthBar.value = health.Value;}
}

把playerMovement脚本，Health脚本，Damageable脚本，挂载到Player对象上，拖拽情况如图所示

using UnityEngine;
using UnityEngine.InputSystem;
using DG.Tweening;public class playerMovement : MonoBehaviour
{[SerializeField]private Rigidbody2D rb;private Vector2 _inputDirection;[SerializeField]private float _speed;public void Move(InputAction.CallbackContext context){_inputDirection = context.ReadValue<Vector2>();}private void FixedUpdate(){var position = (Vector2)transform.position;var targetPosition = position + _inputDirection;if (position == targetPosition) return;rb.DOMove(targetPosition, _speed).SetSpeedBased();}
}

using UnityEngine;
using UnityEngine.Events;public class Health : MonoBehaviour
{[SerializeField] private int health;[SerializeField] private UnityEvent<int> healthchange;public int Value{get { return health; }}//减少血量public void DreaseHealth(int amount){//血量减去被传进来的值health -= amount;healthchange.Invoke(health);}}

using DG.Tweening;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class Damageable : MonoBehaviour
{[SerializeField]private Health health;//想要实现被伤害时变红闪烁一下[SerializeField]private SpriteRenderer spriteRenderer;public void TakeDamage(int damage){health.DreaseHealth(damage);//在DG.Tweening包中，记得引入//DOColor()需要的两个arguement：第一个是确定颜色，第二个是完成变换所需要的时间//再变回去需要SetLoops(),两个arguemengt，一个是变换几圈，一个是以什么方式变//红色到白色是一圈，红色到白色是另一圈//Yoyo：慢慢变换//还需要用ChangeStartValue()给一个起始颜色spriteRenderer.DOColor(Color.red,0.2f).SetLoops(2,LoopType.Yoyo).ChangeStartValue(Color.white);}
}

把Attack脚本和EnemyMovement脚本，挂载到Enemy对象上

using DG.Tweening;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class EnemyMovement : MonoBehaviour
{[SerializeField] private Rigidbody2D rb;[SerializeField] private float _speed;[SerializeField]private PlayerManager playerManager;private void FixedUpdate(){//玩家当前位置var playPosition = playerManager.position;//敌人自己当前位置坐标var position=(Vector2)transform.position;//当前距离距玩家位置（移动的方向）var direction=playPosition-position; //数字规范（方便计算）direction.Normalize();//目的坐标var targetPosition = position + direction;//向目的地移动rb.DOMove(targetPosition, _speed).SetSpeedBased();}}

using UnityEngine;
using Timers;public class Attack : MonoBehaviour
{private bool _canAttack = true;private void OnTriggerEnter2D(Collider2D col){DealDamage(col);}private void OnTriggerStay2D(Collider2D other){DealDamage(other);}private void CanAttack(){_canAttack=true;}private void DealDamage(Collider2D other){if (!_canAttack) return;//Player为标签if (other.CompareTag("Player")){var damageable = other.GetComponent<Damageable>();damageable.TakeDamage(10);//三个argumentTimersManager.SetTimer(this, 1, CanAttack);_canAttack = false;}}
}

PlayerManager脚本挂载到空物体Manager上面

using UnityEngine;//获取玩家位置
public class PlayerManager:MonoBehaviour
{[SerializeField] private Transform playerTransform;//任何脚本呼叫PlayerManager时，都可以获得玩家位置public Vector2 position{get { return playerTransform.position; }}
}