Unity2D教程入门-17：class调用

链接：https://www.bilibili.com/video/BV1i4411m7fK?spm_id_from=pageDriver

创建一个父类Enemy脚本↓↓↓↓↓，敌人需要功能从该脚本调用

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

public class Enemy2 : MonoBehaviour
{
    protected Rigidbody2D rb;//定义变量以protected替换public
    protected Collider2D coll;
    protected Animator anim;
    protected virtual void Start()//void Start()前添加protected virtual，子类则添加protected override；
    {
        coll = GetComponent<Collider2D>();
        anim = GetComponent<Animator>();
        rb = GetComponent<Rigidbody2D>();
    }
    public void Death()
    {
        Destroy(gameObject);
    }
    public void JumpOn()
    {
        anim.SetTrigger("death");
        coll.enabled = false;
        rb.velocity = new Vector2(0, 0);
    }
}

下面是Frog脚本

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

public class Enemy_Frog2 : Enemy2
{
    //private Rigidbody2D rb;
    //private Collider2D coll;
    //private Animator anim;//这三行因为父类已经调用了，下面base.Start();即可调用。
    private float pointLeft, pointRight;
    private bool faceLeft = true;

    public Transform pointLeftREF, pointRightREF;
    public float speed, jumpForce;
    public LayerMask Ground;

    protected override void Start()
    {
        base.Start();
        //rb = GetComponent<Rigidbody2D>();
        //coll = GetComponent<Collider2D>();
        //anim = GetComponent<Animator>();
        pointLeft = pointLeftREF.transform.position.x;
        pointRight = pointRightREF.transform.position.x;
        Destroy(pointLeftREF.gameObject);
        Destroy(pointRightREF.gameObject);

    }


    void Update()
    {
        SwitchAnim();
    }

    void Movement()
    {
        if (faceLeft)
        {
            if (coll.IsTouchingLayers(Ground))
            {
                anim.SetBool("jumping", true);
                rb.velocity = new Vector2(-speed, jumpForce);
            }
        }
        else
        {
            if (coll.IsTouchingLayers(Ground))
            {
                anim.SetBool("jumping", true);
                rb.velocity = new Vector2(speed, jumpForce);
            }
        }
    }
    void SwitchAnim()
    {
        if (coll.enabled)
        {
            if (anim.GetBool("jumping"))
            {
                if (rb.velocity.y < 0.1f)
                {
                    anim.SetBool("falling", true);
                    anim.SetBool("jumping", false);
                }
            }
            if (anim.GetBool("falling") && coll.IsTouchingLayers(Ground))
            {
                anim.SetBool("falling", false);
                if (transform.position.x < pointLeft)
                {
                    faceLeft = false;
                    transform.localScale = new Vector3(-1, 1, 1);
                }
                if (transform.position.x > pointRight)
                {
                    faceLeft = true;
                    transform.localScale = new Vector3(1, 1, 1);
                }
            }
        }
        else
        {
            rb.velocity = new Vector2(0, 0);
        }
    }
}

下面是Eagle脚本

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

public class Enemy_Eagle2 : Enemy2
{
    public Transform pointTop, pointBottom;//获取eagle顶部和底部参考点坐标
    public float speed;

    private float top, bottom;

    protected override void Start()
    {
        base.Start();//因为在夫类已经制定了组件，改句功能就是调用start内语句
        top = pointTop.position.y;
        bottom = pointBottom.position.y;//先赋值
        Destroy(pointTop.gameObject);
        Destroy(pointBottom.gameObject);//然后销毁参考坐标的物体
    }

    void Update()
    {
        if (coll.enabled)
        {
            rb.velocity = new Vector2(0, speed);
            if (transform.position.y > top)
            {
                transform.position = new Vector2(transform.position.x, top - 0.5f);
                speed = -speed;
            }
            if (transform.position.y < bottom)
            {
                transform.position = new Vector2(transform.position.x, bottom + 0.5f);
                speed = -speed;
            }
        }
    }
}

Player在JumpOn调用Enemy函数：

    private void OnCollisionEnter2D(Collision2D collision)//踩踏事件判定下落时和标签为Enemy
    {
         
        if (collision.gameObject.tag == "Enemy")
        {
            //Enemy_Frog frog = collision.gameObject.GetComponent<Enemy_Frog>(); //Course17前部分;生成一个叫frog的实体，当调用frog时可以调用Enemy_Frog里的所有代码
            Enemy enemy = collision.gameObject.GetComponent<Enemy>();//Course17-5,调用一个父类Enemy生成一个实体enemy
            if (anim.GetBool("falling"))
            {
                //这里敌人销毁不用，因为已经在Enemy_Frog里调用了销毁的语句JumpOn 。Destroy(collision.gameObject);
                //frog.JumpOn();
                enemy.JumpOn();//Course17-5，调用时使用实体enemy
                rb.velocity = new Vector2(rb.velocity.x, jumpforce * Time.fixedDeltaTime);
                anim.SetBool("jumping", true);
            }
            else
            if (transform.position.x < collision.gameObject.transform.position.x)
            {
                rb.velocity = new Vector2(-5, rb.velocity.y);
                anim.SetBool("hurt", true);
                isHurt = true;
            }
            else
            if (transform.position.x > collision.gameObject.transform.position.x)
            {
                rb.velocity = new Vector2(5, 4);
                anim.SetBool("hurt", true);
                isHurt = true;
            }
        }
    }

调用一个父类Enemy生成一个实体enemy↓

        Enemy enemy = collision.gameObject.GetComponent<Enemy>();
        enemy.JumpOn();

直接调出父类里面的JumpOn();

记：

velocity需要在前面添加rb，transform不需要.eg:

rb.velocity = new Vector2(0, 0);
transform.localScale = new Vector3(-1, 1, 1);