Public variable not showing in inspector using new Input System

Questions & Answers
1

Hi! I decided to have a go with the new input system and make a simple top down 2D movement script with it. The script worked fine using the old system but now that I have converted it to the new system I have an issue. The input system needs a reference to Input mappings but when I have a public (or private, serialized) variable the field will not show up in the inspector. Here is the code I have:

public class PlayerMovement : MonoBehaviour
{

    public float moveSpeed = 4f;
    public InputMaster controls;

    private Rigidbody2D rb;

    private void Awake()
    {
        rb = GetComponent<Rigidbody2D>();

        controls.PlayerMap.Movement.performed += ctx => MovePlayer(ctx.ReadValue<Vector2>());
    }

    private void OnEnable()
    {
        controls.Enable();
    }

    private void OnDisable()
    {
        controls.Disable();
    }

    private void MovePlayer(Vector2 direction)
    {
        rb.velocity = direction.normalized * moveSpeed;

        //TODO: Animate Sprite
    }
}

I am getting no errors in the console and can’t see anything wrong with my code. Thanks for the help!

2

I had implemented the input system wrong because I was following an outdated tutorial. Whoops!

For anyone wondering, here is the working code:

using UnityEngine;
using UnityEngine.InputSystem;

public class PlayerMovement : MonoBehaviour, InputMaster.IPlayerMapActions
{

    public float moveSpeed = 4f;

    public InputMaster controls;

    private Rigidbody2D rb;

    private void Awake()
    {
        rb = GetComponent<Rigidbody2D>();
    }

    public void OnEnable()
    {
        if (controls == null)
        {
            controls = new InputMaster();
            controls.PlayerMap.SetCallbacks(this);
        }
        controls.PlayerMap.Enable();
    }

    public void OnMovement(InputAction.CallbackContext context)
    {
        Vector2 direction = context.ReadValue<Vector2>();

        rb.velocity = direction.normalized * moveSpeed;

        //TODO: Animate Sprite
    }
}
3

I spent way too long wondering what I was doing wrong before reading the comments on the brackeys tutorial.

video reference:


comment by user cbox reads:

“TIP For those doing the tutorial more
recently, you can no longer drag the
file into the inspector as they
changed the backend. You can just do
controls = new InputMaster(); in awake
to create a new instance of the
object.”

Essentially, IF your code looks like this:

`
using UnityEngine.InputSystem;
using UnityEngine;

public class ThirdPersonMovement : MonoBehaviour
{
public InputMaster controls;

void Awake()
{
    controls.Player.Movement.performed += _ => Move();
    controls.Player.Shoot.performed += ctx => Shoot();
}

void Move()
{
    Debug.Log("Move");
}

void Shoot()
{
    Debug.Log("Shot");
}

private void OnEnable()
{
    controls.Enable();
}

private void OnDisable()
{
    controls.Disable();
}

}
Then you just need to add **controls = new InputMaster();** in the awake function
using UnityEngine.InputSystem;
using UnityEngine;

public class ThirdPersonMovement : MonoBehaviour
{
public InputMaster controls;

void Awake()
{
    // ADD NEW INSTANCE HERE-->
    controls = new InputMaster();

    controls.Player.Movement.performed += _ => Move();
    controls.Player.Shoot.performed += ctx => Shoot();
}

void Move()
{
    Debug.Log("Move");
}

void Shoot()
{
    Debug.Log("Shot");
}

private void OnEnable()
{
    controls.Enable();
}

private void OnDisable()
{
    controls.Disable();
}

}
`