Unity中键鼠控制Player Sprite移动时闪烁问题求助

我正在开发一款2D俯视角射击控制器，多数情况下运行正常，但同时连接键鼠与手柄时，使用键鼠控制Player Sprite移动偶尔会出现闪烁现象，仅使用手柄时无此问题。

移动脚本代码 #

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

public class PlayerMovement : MonoBehaviour
{
    [SerializeField] float playerSpeed = 5f;
    [SerializeField] float controllerDeadzone = 0.1f;
    [SerializeField] float gamepadRotationSmoothing = 1000f;
    [SerializeField] bool isGamepad;

    Rigidbody2D _rigidbody2D;
    PlayerInput playerInput;
    Controllers controllers;

    Vector2 movement;
    Vector2 aim;

    private void Awake()
    {
        _rigidbody2D = GetComponent<Rigidbody2D>();
        playerInput = GetComponent<PlayerInput>();
        controllers = new Controllers();
    }

    void OnEnable()
    {
        controllers.Enable();
    }

    void OnDisable()
    {
        controllers.Disable();
    }


    void FixedUpdate()
    {
        HandleInput();
        HandleMovement();
        HandleRotation();
    }



    private void HandleInput()
    {
        movement = controllers.Controls.Movement.ReadValue<Vector2>();
        aim = controllers.Controls.Aim.ReadValue<Vector2>();
    }

    private void HandleMovement()
    {
        Vector2 move = new Vector2(movement.x, movement.y);
        _rigidbody2D.velocity = move * playerSpeed * Time.deltaTime;
    }

    private void HandleRotation()
    {
        Vector2 playerDirection = new Vector2(aim.x, aim.y);
        float rotationDegree = Mathf.Atan2(playerDirection.y, playerDirection.x) * Mathf.Rad2Deg - 90f;

        if (isGamepad)
        {
            if (Mathf.Abs(aim.x) > controllerDeadzone || Mathf.Abs(aim.y) > controllerDeadzone)
            {
                if (playerDirection.sqrMagnitude > 0.0f)
                {
                    Quaternion newRotation = Quaternion.Euler(0, 0, rotationDegree);
                    transform.rotation = Quaternion.RotateTowards(transform.rotation, newRotation, gamepadRotationSmoothing * Time.deltaTime);
                }
            }
        }
        else
        {
            Vector3 mouseWorldPosition = Camera.main.ScreenToWorldPoint(aim);
            Vector3 targetDirection = mouseWorldPosition - transform.position;
            float angle = Mathf.Atan2(targetDirection.y, targetDirection.x) * Mathf.Rad2Deg - 90f;
            transform.rotation = Quaternion.Euler(new Vector3(0, 0, angle));
        }
    }

    public void OnDeviceChange(PlayerInput pi)
    {
        isGamepad = pi.currentControlScheme.Equals("Gamepad") ? true : false;
    }
}

问题排查与修复方案 #

1. 修复输入冲突：过滤手柄静默输入 #

当同时连接键鼠和手柄时，手柄摇杆即使未操作也可能返回微小非零值，混合键鼠输入导致移动抖动。修改HandleInput方法，根据当前控制方案过滤无效输入：

private void HandleInput()
{
    if (isGamepad)
    {
        movement = controllers.Controls.Movement.ReadValue<Vector2>();
        // 死区过滤手柄微小输入
        if (movement.magnitude < controllerDeadzone)
            movement = Vector2.zero;
    }
    else
    {
        movement = controllers.Controls.Movement.ReadValue<Vector2>();
    }
    aim = controllers.Controls.Aim.ReadValue<Vector2>();
}

2. 同步输入读取与帧更新逻辑 #

InputSystem的输入更新频率与FixedUpdate不同步，易引发输入跳变。将输入读取移到Update中，物理更新保留在FixedUpdate：

void Update()
{
    HandleInput();
}

void FixedUpdate()
{
    HandleMovement();
    HandleRotation();
}

3. 修正速度计算错误 #

Rigidbody2D的velocity单位是单位/秒，无需乘以Time.deltaTime，错误缩放会导致速度异常抖动：

private void HandleMovement()
{
    _rigidbody2D.velocity = movement * playerSpeed;
}

4. 实时检测输入设备，避免切换延迟 #

OnDeviceChange可能存在触发延迟，在HandleInput中实时判断当前活跃输入设备：

private void HandleInput()
{
    // 实时检测是否使用手柄
    isGamepad = Gamepad.current != null && Gamepad.current.isActive;
    
    movement = controllers.Controls.Movement.ReadValue<Vector2>();
    // 仅对手柄输入应用死区
    if (isGamepad && movement.magnitude < controllerDeadzone)
        movement = Vector2.zero;
    
    aim = controllers.Controls.Aim.ReadValue<Vector2>();
}

内容的提问来源于stack exchange，提问作者Reza Rahem