Unity获取鼠标停留位置下的物体

根据UGUI的射线检测机制获取当前鼠标下的UI：

    /// 

    /// 获取鼠标停留处UI
    /// 
    /// 
    /// 
    public GameObject GetOverUI(GameObject canvas)
    {
        PointerEventData pointerEventData = new PointerEventData(EventSystem.current);
        pointerEventData.position = Input.mousePosition;
        GraphicRaycaster gr = canvas.GetComponent();
        List results = new List();
        gr.Raycast(pointerEventData, results);
        if (results.Count != 0)
        {
            return results[0].gameObject;
        }

        return null;
    }

其中，results为鼠标下UI的列表。

不仅适用于UGUI，可以在摄像机上添加PhysicsRaycaster组件，传参为摄像机，这样就可以获取3D物体。

    /// 

    /// 获取鼠标停留处物体
    /// 
    /// 
    /// 
    public GameObject GetOverGameObject(GameObject raycaster)
    {
        PointerEventData pointerEventData = new PointerEventData(EventSystem.current);
        pointerEventData.position = Input.mousePosition;
        PhysicsRaycaster pr = raycaster.GetComponent();
        List results = new List();
        pr.Raycast(pointerEventData, results);
        if (results.Count != 0)
        {
            return results[0].gameObject;
        }

        return null;
    }

刚遇到一个问题，我的UI点击包括3D物体点击都是用的EventSystem，也就是上面的方法，这时用

UnityEngine.EventSystems.EventSystem.current.IsPointerOverGameObject()这个方法去判断鼠标是否在UI上，就会出现鼠标在3D物体上也会拿到返回值，（没有去研究传参index的用法），直接选择了上面获取UI的获取方法。

 

脚本：

/************************************************************
* 版本声明：v1.0.0
* 类 名 称：MouseOverController.cs
* 创建日期：2019/8/10 16:10:44
* 作者名称：末零
* 功能描述：获取鼠标停留处的物体
************************************************************/

using System.Collections.Generic;

using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

namespace LastZero.Utility
{
    public class MouseOverController
    {
        /// 

        /// 获取鼠标停留处UI
        /// 
        /// 
        /// 
        public static GameObject GetOverUI(GameObject canvas)
        {
            PointerEventData pointerEventData = new PointerEventData(EventSystem.current);
            pointerEventData.position = Input.mousePosition;
            GraphicRaycaster gr = canvas.GetComponent();
            List results = new List();
            gr.Raycast(pointerEventData, results);
            if (results.Count != 0)
            {
                return results[0].gameObject;
            }

            return null;
        }

        /// 

        /// 获取鼠标停留处UI
        /// 
        /// 
        /// 
        public static GameObject GetOverGameObject(GameObject camera)
        {
            if (camera.GetComponent() == null)
                camera.AddComponent();

            PointerEventData pointerEventData = new PointerEventData(EventSystem.current);
            pointerEventData.position = Input.mousePosition;
            PhysicsRaycaster gr = camera.GetComponent();
            List results = new List();
            gr.Raycast(pointerEventData, results);
            if (results.Count != 0)
            {
                return results[0].gameObject;
            }

            return null;
        }
    }
}

返回目录