Simply drag objects to the item bar

Code ： Need to move the code on the object （ Here is the blood bottle ）

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

public class DragDrop : MonoBehaviour,IPointerDownHandler,IBeginDragHandler ,IEndDragHandler,IDragHandler{
    

    private RectTransform m_rectTransform;
    public Canvas m_Canvas;
    private CanvasGroup m_CanvasGroup;
    void Start()
    {
    
        m_rectTransform = GetComponent<RectTransform>();
        m_CanvasGroup = GetComponent<CanvasGroup>();
    }
    /// <summary>
    ///  Before starting drag and drop 
    /// </summary>
    /// <param name="eventData"></param>
    public void OnBeginDrag(PointerEventData eventData)
    {
    
        Debug.Log("OnBeginDrag");
        m_CanvasGroup.blocksRaycasts = false;
        m_CanvasGroup.alpha = 0.6f;
    }
    /// <summary>
    ///  Drag and drop 
    /// </summary>
    /// <param name="eventData"></param>
    public void OnDrag(PointerEventData eventData)
    {
    
        m_rectTransform.anchoredPosition += eventData.delta/ m_Canvas.scaleFactor;
    }

    /// <summary>
    ///  Drag end 
    /// </summary>
    /// <param name="eventData"></param>
    public void OnEndDrag(PointerEventData eventData)
    {
    
        Debug.Log("OnEndDrag Drag end ");
        m_CanvasGroup.blocksRaycasts = true;
        m_CanvasGroup.alpha = 1f;
    }

    public void OnPointerDown(PointerEventData eventData)
    {
    
        Debug.Log("OnPointerDown");
    }

 
}

Code ： Item grid code

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
public class IteamSlot : MonoBehaviour, IDropHandler
{
    
    public void OnDrop(PointerEventData eventData)
    {
    
        if(eventData.pointerDrag!=null)
        {
    
            eventData.pointerDrag.GetComponent<RectTransform>().anchoredPosition = GetComponent<RectTransform>().anchoredPosition;
        }
        
    }
}

Just put the script on the grid ,
A little bad , Move the mouse to the grid to have the effect of putting it in （ You can try if you need ）