Unity中SpeedBoost无法取消，玩家持续保持加速状态求助

核心问题 #

• 触发SpeedBoost时直接修改了moveSpeed的值为runSpeed，导致原本的基础移动速度被永久覆盖，后续无法正确恢复
• 计时器结束时的恢复逻辑完全错误，错误地将runSpeed设置为已被修改的moveSpeed，等于没有恢复速度

修复步骤 #

1. 新增默认速度存储变量：添加private float defaultMoveSpeed;，专门保存Inspector中设置的初始基础移动速度，避免原数值被覆盖
2. 初始化默认速度：在Start()方法中记录初始基础速度：defaultMoveSpeed = moveSpeed;
3. 修正触发逻辑：触发SpeedBoost时，无需修改任何速度变量，只需开启boosting状态并重置计时器
4. 调整速度优先级：在Update中优先判断boosting状态，再处理Shift键的奔跑逻辑，确保Boost期间强制使用奔跑速度
5. 简化恢复逻辑：计时器结束时，仅关闭boosting状态即可，无需修改速度变量

修改后的完整代码 #

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

public class PlayerController : MonoBehaviour
{
    public float moveSpeed;
    public Rigidbody2D rb;
    public float jumpForce;
    public float runSpeed;
    private float activeSpeed;
    private float defaultMoveSpeed; // 存储初始基础速度

    public bool isGrounded;
    public Transform groundCheckPoint;
    public float groundCheckRadius;
    public LayerMask whatIsGround;

    public Animator ani;
    private float boostTimer;
    private bool boosting;

    // Start is called before the first frame update
    void Start()
    {
        boostTimer = 0;
        boosting = false;
        defaultMoveSpeed = moveSpeed; // 初始化默认基础速度
    }

    // Update is called once per frame
    void Update()
    {
        isGrounded = Physics2D.OverlapCircle(groundCheckPoint.position, groundCheckRadius, whatIsGround); 

        // 优先判断Boost状态，再处理Shift奔跑
        activeSpeed = defaultMoveSpeed;
        if(boosting || Input.GetKey(KeyCode.LeftShift))
        {
            activeSpeed = runSpeed;
        }
        
        rb.velocity = new Vector2 ( Input.GetAxisRaw("Horizontal") * activeSpeed, rb.velocity.y);

        if (Input.GetButtonDown("Jump"))
        {
            if(isGrounded == true)
            {
               rb.velocity = new Vector2(rb.velocity.x, jumpForce);
            }
        } 

        if(rb.velocity.x > 0)
        {
            transform.localScale = Vector3.one;
        }
        if (rb.velocity.x < 0)
        {
            transform.localScale = new Vector3(-1f, 1f, 1f);
        }

        //动画控制
        ani.SetFloat("speed", Mathf.Abs(rb.velocity.x));
        ani.SetBool("isGrounded", isGrounded);
        ani.SetFloat("ySpeed", rb.velocity.y);

        if (boosting)
        {
            boostTimer += Time.deltaTime;
            if(boostTimer >= 3)
            {
                boostTimer = 0;
                boosting = false; // 仅关闭Boost状态
            }
        }
    }

    void OnTriggerEnter2D(Collider2D other)
    {
        if (other.tag == "SpeedBoost")
        {
            boosting = true;
            boostTimer = 0; // 重置计时器
            Destroy(other.gameObject);
        }
    }

    public void KnockBack()
    {
        rb.velocity = new Vector2(0f, jumpForce * .5f);
        ani.SetTrigger("isHit");
    }
}

内容的提问来源于stack exchange，提问作者Crexlo Dev