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一：UI元素 ——使用UI事件接口

using UnityEngine;using UnityEngine.EventSystems;using UnityEngine.UI;public class Test : MonoBehaviour,IDragHandler{    private GameObject nowDrag_go;//当前拖拽的物体    public void OnDrag(PointerEventData eventData)    {        FollowMouse(eventData);    }    private void FollowMouse(PointerEventData eventData)    {        Vector3 globalMousePos;        if (RectTransformUtility.ScreenPointToWorldPointInRectangle(GameObject.Find("Canvas").transform as RectTransform,             eventData.position, eventData.pressEventCamera, out globalMousePos))        {            nowDrag_go.transform.position = globalMousePos;        }    }}

二：2D/3D物体——使用生命周期函数

using System;using UnityEngine;public class Test : MonoBehaviour{    private void Awake()    {        Input.multiTouchEnabled = false;    }    private void OnMouseDrag()    {        //得到摄像机到物体的向量        Vector3 v = transform.position - Camera.main.transform.position;        //得到摄像机与物体所在平面的距离        float dis = Vector3.Dot(v, Camera.main.transform.forward);        transform.position = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, dis));    }}

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