[游戏开发]Unity_拖拽_UGUI

//先是拖拽之后学完交换的再来个交换的 也可能不来了emm
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;

public class TuoZhuaiYiDong : MonoBehaviour, IDragHandler, IBeginDragHandler, IEndDragHandler
{
    public Vector3 yuanshiweizhi ;//移动前的位置
    public void OnDrag(PointerEventData eventData)
    {
        SetDraggedPosition(eventData);
    }
    public void OnBeginDrag(PointerEventData eventData)
    {
        yuanshiweizhi = transform.position;
        SetDraggedPosition(eventData);
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        transform.position = yuanshiweizhi;
    }
    private void SetDraggedPosition(PointerEventData eventData)
    {
        var rt = gameObject.GetComponent<RectTransform>();
        Vector3 globalMousePos;
        if (RectTransformUtility.ScreenPointToWorldPointInRectangle(rt, eventData.position, eventData.pressEventCamera, out globalMousePos))
        {
            rt.position = globalMousePos;//让物体跟随鼠标
        }
    }
}