【Unity实现背包拖拽功能】-Toy模板网

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Unity实现背包拖拽功能可以实现背包拖拽交换位置、合成等一系列功能的实现文章来源地址https://www.toymoban.com/news/detail-529913.html

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

public class DragCtrl : MonoBehaviour, IBeginDragHandler, IEndDragHandler, IDragHandler, ICanvasRaycastFilter
{
    public GradeItem item;
    private Transform nowparent;
    private bool isRaycastLocationValid = true;//默认射线不能穿透物体
    public Transform IconList;//存放拖拽物体的公共节点
    public bool IsRaycastLocationValid(Vector2 sp, Camera eventCamera)
    {
        return isRaycastLocationValid;
    }
    /// <summary>
    /// 开始拖动
    /// </summary>
    /// <param name="eventData"></param>
    public void OnBeginDrag(PointerEventData eventData)
    {
        OClickBtn();
        this.transform.SetAsLastSibling();//将被拖拽的物体设置为最后渲染
        nowparent = this.transform.parent;//保存最初始的位置
        isRaycastLocationValid = false;//设置射线穿透
        transform.SetParent(IconList);//将拖拽的物体放在公共父节点下
        //下面可以放拖拽时的功能
    }

    /// <summary>
    /// 拖动中
    /// </summary>
    /// <param name="eventData"></param>
    public void OnDrag(PointerEventData eventData)
    {
        Vector2 v2 = Vector2.zero;
        RectTransformUtility.ScreenPointToLocalPointInRectangle(IconList.GetComponent<RectTransform>(), Input.mousePosition,StaffUIMgr.instance.mCamera, out v2);将拖拽时的屏幕坐标转换为公共节点下的局部坐标，不转换将看不见拖拽物体
        transform.localPosition = v2;
    }

    /// <summary>
    /// 拖动结束
    /// </summary>
    /// <param name="eventData"></param>
    /// <exception cref="System.NotImplementedException"></exception>
    public void OnEndDrag(PointerEventData eventData)
    {
        //transform.Find("Select").gameObject.SetActive(false);
        GameObject go = eventData.pointerCurrentRaycast.gameObject;
        if(go != null)
        {
            if (go.transform.parent.name == "iconItem")
            {
                //放拖动结束需要实现的功能
            }
            else
            {
            	//拖动失败  拖动物体复原
                transform.SetParent(nowparent);
                transform.position = nowparent.position;
            }
        }
        else
        {
        	//拖动失败  拖动物体复原
            transform.SetParent(nowparent);
            transform.position = nowparent.position;
        }
        isRaycastLocationValid = true;//射线不可以穿透物体
    }