I am currently working on a sprint function for my first person controller.

My setup is a “PlayerMovementController”, a “PlayerStatusController” and a Scriptable Object “PlayerStatusData” which the StatusController is getting information about the Player Stamina.

PlayerMovementController:

    private void Update()
    {
        HandleMovementInput();
        ApplyMovement();
    }

    private void HandleMovementInput()
    {
        if (Input.GetKey(sprintKey) && !isSprinting)                 // SPRINTING
        {
            if (OnCheckStamina != null && OnCheckStamina())
            {
                StartSprint();
                OnStaminaDrain?.Invoke();
            }
        }
        else                                                         // NOT SPRINTING
        {
            StopSprint();
            OnStaminaRegen?.Invoke();
        }
        /*** SPRINTING ENDE ***/

        currentInput = new Vector2(movementSpeed * Input.GetAxis("Vertical"), movementSpeed * Input.GetAxis("Horizontal"));
        float moveDirectionY = moveDirection.y;
        moveDirection = (transform.TransformDirection(Vector3.forward) * currentInput.x) + (transform.TransformDirection(Vector3.right) * currentInput.y);
        moveDirection.y = moveDirectionY;
    }

    private void ApplyMovement()
    {
        if (!characterController.isGrounded)
            moveDirection.y -= gravity * Time.deltaTime;

        characterController.Move(moveDirection * Time.deltaTime);
    }


    private void StartSprint()
    {
        isSprinting = true;
        movementSpeed = sprintSpeed;
        
    }

    private void StopSprint()
    {
        isSprinting = false;
        movementSpeed = walkSpeed;
        
    }

The Sprint itself works fine like this, but i have noticed on the Inspector the isSprinting boolean und movementSpeed is constantly changing between true and false and 3f to 1.8f.
I can’t believe that this is normal, there has to be a proper switch… right?
In the gameview itself it does not seem like a problem but the Stamina System with those events is not really working. They are constantly switchting between “Regenerating Stamina” and “Draining Stamina”

PlayerStatusController:

public class PlayerStatusController : MonoBehaviour
{
    [Header("Scriptable Object")]
    public PlayerStatusData playerStatusData, pSD;

    private void OnEnable()
    {
        PlayerMovementController.OnCheckStamina += HasStamina;
        PlayerMovementController.OnStaminaDrain += DrainStamina;
        PlayerMovementController.OnStaminaRegen += RegenerateStamina;
    }

    private void OnDisable()
    {
        PlayerMovementController.OnCheckStamina -= HasStamina;
        PlayerMovementController.OnStaminaDrain -= DrainStamina;
        PlayerMovementController.OnStaminaRegen -= RegenerateStamina;

    }
    private bool HasStamina()
    {
        return playerStatusData.currentStamina > 0;
    }

    private void DrainStamina()
    {
        if (playerStatusData.currentStamina != playerStatusData.minStamina)
        {
            playerStatusData.currentStamina -= playerStatusData.staminaDrain * Time.deltaTime;
            playerStatusData.currentStamina = Mathf.Max(0, playerStatusData.currentStamina); // Ensure stamina doesn't go below 0
            Debug.Log("DRAINING STAMINA");
        }

    }

    private void RegenerateStamina()
    {
        if (playerStatusData.currentStamina < playerStatusData.maxStamina)
        {
            playerStatusData.currentStamina += playerStatusData.staminaRegen * Time.deltaTime;
            playerStatusData.currentStamina = Mathf.Min(100, playerStatusData.currentStamina); // Ensure stamina doesn't go above 100
            Debug.Log("REGENERATING STAMINA");
        }
    }
}

In my eyes the event system should work just fine… but i think there is a problem with the on/off toggling on the sprint script which is causing problems in the stamina system. Anyone have a fix for this?