DragDropM.cs

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


public class DragDropM : MonoBehaviour, IDragHandler, IDropHandler
{

    [SerializeField] private Canvas canvas;

    private RectTransform rectransform;
    public TMP_Text textshowed;
    bool block = true;


    private void Awake()
    {
        rectransform = GetComponent<RectTransform>();

    }


    public void OnDrag(PointerEventData eventData)
    {

        if (Ui.nbObst == 0)
        {
            Destroy(this.gameObject);
            Ui.nbObst++;
        }
        else
        {
            rectransform.anchoredPosition += eventData.delta / canvas.scaleFactor;
        }
        

    }

    public void OnDrop(PointerEventData eventData)
    {


        while (block == true)
        {

            Ui.nbObst = Ui.nbObst - 1;
            Ui.difficulty = Ui.difficulty + 2;

            block = false;
        }


    }
}