单位字符不随轴系移动

Question

你好我正在尝试制作一个 2D 简单的平台游戏，我是 Unity 的初学者。出于某种原因，当我按下箭头键时，我的角色会播放向前的动画，但根本不会移动。然后当我释放它时播放空闲动画。它也不会跳。下面我附上了代码。我已经研究并尝试了许多修补刚体的方法，但都没有奏效。目前，我的播放器和地面都有一个多边形对撞机。我的角色也有一个刚体。我什至尝试添加调试日志来显示我的移动输入。到目前为止，当我按下箭头键时，移动输入会发生变化。所以，在我看来，我认为物理学有问题。

任何帮助将不胜感激，

谢谢

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

public class PlayerController : MonoBehaviour
{
public float speed;
public float jumpforce;
private float moveInput;

private Rigidbody2D rb;

private bool facingRight = true;

private bool isGrounded;
public Transform GroundCheck;
public float checkRadius;
public LayerMask whatIsground;

private int extraJumps;
public int extraJumpsValue;
private Animator anim;

void Start()
{
    anim = GetComponent<Animator>();
    extraJumps = extraJumpsValue;
    rb = GetComponent<Rigidbody2D>();
}

void FixedUpdate()
{
    moveInput = Input.GetAxis("Horizontal");
    Debug.Log(moveInput);  
    rb.velocity = new Vector2(moveInput * speed, rb.velocity.y);

if(facingRight == false && moveInput > 0)
{
    Flip();
}else if(facingRight == true && moveInput < 0)
{
    Flip();
}
}

void Update()
{
    isGrounded = Physics2D.OverlapCircle(GroundCheck.position, checkRadius, whatIsground);

    if (isGrounded == true)
    {
        extraJumps = extraJumpsValue;
    }

    if (Input.GetKeyDown(KeyCode.UpArrow) && extraJumps > 0)
    {
    
    rb.velocity = Vector2.up * jumpforce;

    extraJumps--;
    }else if (Input.GetKeyDown(KeyCode.UpArrow) && extraJumps == 0 && isGrounded == true)
    {
    rb.velocity = Vector2.up * jumpforce;
    }
     if (moveInput == 0)
    {
        anim.SetBool("isRunning", false);
    }else
    {
        anim.SetBool("isRunning", true);
    }
}

void Flip()
{
facingRight = !facingRight;
Vector3 Scaler
}