首页 > 编程语言 > unity 如何判断鼠标是否在哪个UI上(两种方法)
2021
04-27

unity 如何判断鼠标是否在哪个UI上(两种方法)

第一种

可以得到UI，再根据名字判断是不是自己自己要点击的UI

其中参数canvas拖入此UI的canvas

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

第二种就简单了

rect 为要判断的那个UI的RectTransform

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bool isUI = RectTransformUtility.RectangleContainsScreenPoint(rect, Input.mousePosition)

补充：Unity中判断鼠标或者手指是否点击在UI上（UGUI）

在Unity场景中，有时UI和游戏角色都需要响应触摸事件，如果同时响应可能就会出现点击UI的时候影响到了游戏角色。所以我们需要对所点击到的东西做判断，这里使用UGUI系统自带的方法和射线检测的方式，判断是否点击到UI上：

第一种方法，直接在Update中判断：

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void Update()
    {     
        //判断是否点击UI
        if (Input.GetMouseButtonDown(0) || (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Began))
        {
            //移动端
            if (Application.platform == RuntimePlatform.Android ||
                        Application.platform == RuntimePlatform.IPhonePlayer)
            {
                int fingerId = Input.GetTouch(0).fingerId;
                if (EventSystem.current.IsPointerOverGameObject(fingerId))
                {
                    Debug.Log("点击到UI");                   
                }
            }
            //其它平台
            else
            {
                if (EventSystem.current.IsPointerOverGameObject())
                {
                    Debug.Log("点击到UI");                   
                }
            }
        }

第二种方式：射线检测

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using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
public class NewBehaviourScript : MonoBehaviour
{
    // Update is called once per frame
    void Update()
    {
        //移动端
        if (Application.platform == RuntimePlatform.Android ||
                    Application.platform == RuntimePlatform.IPhonePlayer)
        {
            if (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Began)
            {
                if (IsPointerOverGameObject(Input.GetTouch(0).position))
                {
                    Debug.Log("点击到UI");
                }
            }           
        }
        //其它平台
        else
        {
            if(Input.GetMouseButtonDown(0))
            {
                if (IsPointerOverGameObject(Input.mousePosition))
                {
                    Debug.Log("点击到UI");
                }
            }           
        }
    }
  
    /// <summary>
    /// 检测是否点击UI
    /// </summary>
    /// <param name="mousePosition"></param>
    /// <returns></returns>
    private bool IsPointerOverGameObject(Vector2 mousePosition)
    {      
        //创建一个点击事件
        PointerEventData eventData = new PointerEventData(EventSystem.current);
        eventData.position = mousePosition;
        List<RaycastResult> raycastResults = new List<RaycastResult>();
        //向点击位置发射一条射线，检测是否点击UI
        EventSystem.current.RaycastAll(eventData, raycastResults);
        if (raycastResults.Count > 0)
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}

以上为个人经验，希望能给大家一个参考，也希望大家多多支持自学编程网。如有错误或未考虑完全的地方，望不吝赐教。

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