Unity新输入系统异常：特定操作下角色无法跳跃

问题现象 #

• 角色按W+A行走、或W/W+A/W+D奔跑时，无法触发跳跃，SetJump方法内的Debug日志无输出
• 其他移动场景下跳跃功能正常
• 已确认IsGrounded方法功能正常，角色处于平坦地形
• 角色已正确挂载CharacterController、Capsule Collider、Player Input组件，方法绑定无误

输入系统配置 #

• [输入系统配置截图1]
• [输入系统配置截图2]
• [输入系统配置截图3]
• [输入系统配置截图4]

完整代码 #

public class PlayerMovement : MonoBehaviour
{
    [Header("玩家配置")]

    [SerializeField] private float speed = 3f;
    [SerializeField] private float speedWhileRunningMultiplier = 1.3f;
    [SerializeField] private float gravity = -9.8f;
    [SerializeField] private float gravityMultiplier = 3f;
    [SerializeField] private float jumpForce = 9.8f;
    [SerializeField] private float smoothTime = 0.05f;

    [SerializeField] private bool isGrounded = false;

    private CharacterController controller;
    private Animator anim;

    private bool isWalking, isRunning = false;// 用于动画控制

    private float currentSpeedRotating;
    private float verticalVelocity = 0f;
    
    private Vector2 movement2D;
    private Vector3 direction;

    private bool IsGrounded() => controller.isGrounded;

    private void Awake()
    {
        controller = GetComponent<CharacterController>();
        anim = GetComponent<Animator>();
    }

    void FixedUpdate()
    {
        ApplyMovement();
        ApplyRotation();
        ApplyGravity();
    }

    public void SetMovement(InputAction.CallbackContext value)
    {
        movement2D = value.ReadValue<Vector2>();
        direction = new Vector3(movement2D.x, 0, movement2D.y);
        direction.Normalize();
    }

    public void SetJump(InputAction.CallbackContext value)
    {
        if (value.started) Debug.Log("准备跳跃");
        if (!value.started) return;
        if (!IsGrounded()) return;

        verticalVelocity += jumpForce;
    }

    public void SetRun(InputAction.CallbackContext value)
    {
        isRunning = value.performed ? true : false;
    }

    void ApplyMovement()
    {
        isWalking = direction.x != 0 || direction.z != 0;

        float currentSpeed = speed * (isRunning ? speedWhileRunningMultiplier : 1f);

        controller.Move(direction * currentSpeed * Time.deltaTime);
        anim.SetBool("isWalking", isWalking);
        anim.SetBool("isRunning", isRunning);
    }

    void ApplyRotation()
    {
        if (movement2D.sqrMagnitude == 0) return;

        float targetAngle = Mathf.Atan2(direction.x, direction.z) * Mathf.Rad2Deg;
        float angle = Mathf.SmoothDampAngle(transform.eulerAngles.y, targetAngle, ref currentSpeedRotating, smoothTime);
        transform.rotation = Quaternion.Euler(0.0f, angle, 0.0f);   
    }

    void ApplyGravity()
    {
        if (IsGrounded() && verticalVelocity <0.0f)
        {
            verticalVelocity = -1f;
        }
        else
        {
            verticalVelocity += gravity * gravityMultiplier * Time.deltaTime;
        }

        direction.y =  verticalVelocity;
    }
}

排查与解决方案 #

1. 输入动作优先级/交互冲突 #

这是最可能的原因，因为仅在多按键组合时失效：

• 打开输入系统配置，检查Run动作的Interaction设置，若为Hold类交互，确认是否与Jump动作的输入触发逻辑互斥
• 确保Jump动作的交互类型为Press，且未设置任何会拦截输入的规则
• 检查动作的Canceled触发条件，避免多按键组合时跳跃动作被意外取消

2. 输入绑定冲突检查 #

• 确认跳跃按键（如Space）未被Movement或Run动作重复绑定
• 临时将跳跃绑定到其他按键（如K），测试相同移动场景下是否能触发，排除原按键的硬件/系统级冲突

3. 代码临时验证 #

若怀疑是输入触发问题，可临时修改SetJump方法，移除地面判断，验证Debug日志是否输出：

public void SetJump(InputAction.CallbackContext value)
{
    if (value.started) Debug.Log("准备跳跃");
    if (!value.started) return;
    // 临时注释地面判断，测试输入是否触发
    // if (!IsGrounded()) return;

    verticalVelocity += jumpForce;
}

4. Player Input组件设置 #

• 确认Player Input的Behavior为Invoke Unity Events，且Jump动作与SetJump方法绑定无误
• 检查运行时Action Map是否处于激活状态，无其他逻辑切换到无效Map

内容的提问来源于stack exchange，提问作者Jamelaumn