this is in managerUi cs but when i

[zinc bramble]

what exactly is the issue you're having?

[unkempt finch]

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

public class managerUi : MonoBehaviour
{
    public managerWeaponChange mngrWeaponChange;
    // Start is called before the first frame update
    void Start()
    {
        mngrWeaponChange = GameObject.FindGameObjectWithTag("Player").GetComponent<managerWeaponChange>();
    }
    public void ButtonWeaponChange()
    {
        Debug.Log(EventSystem.current.currentSelectedGameObject);
        GameObject tempBtn = EventSystem.current.currentSelectedGameObject;
        int tempBtnIndex = tempBtn.transform.GetSiblingIndex();

        mngrWeaponChange.ChangeWeapon(tempBtnIndex);
        //Debug.Log (tempBtn + ":" + tempBtnIndex);
    }
    
}

this is manageUi.cs

this is KeyPress.cs

using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;

public class KeyPress : MonoBehaviour
{
    public KeyCode _Key;
    public Button managerUi;
    void Awake()
    {
        managerUi = GetComponent<Button>();
    }
    void Update()
    {
        if(Input.GetKeyDown(_Key))
        {
            FadeToColor(managerUi.colors.pressedColor);
            managerUi.onClick.Invoke();
        }
        else if(Input.GetKeyUp(_Key))
        {
            FadeToColor(managerUi.colors.normalColor);
        }
    }

    void FadeToColor(Color color)
    {
        Graphic graphic = GetComponent<Graphic>();
        graphic.CrossFadeColor(color, managerUi.colors.fadeDuration, true, true);
    }

}```

[uncut bane]

relax

no one cares about this code

no one needs to see it

[uncut bane]

screenshot the event system

[unkempt finch]

ok

[uncut bane]

click the replace button

[unkempt finch]

replace button?

[uncut bane]

yes

[unkempt finch]

replace with the inputsystem?

[uncut bane]

yes

[zinc bramble]

the one under the big red error icon

[unkempt finch]

done

what now?

[uncut bane]

now see if it works

[unkempt finch]

ok

no :((

[unkempt finch]

the button press works, but the player's hand is empty

[hexed mica]

GameObject tempBtn = EventSystem.current.currentSelectedGameObject; is null, fix that

[unkempt finch]

how to do that?

[zinc bramble]

bro you gotta learn about naming conventions

your code is really hard to read. also, you should be able to assign tempbtn in the inspector