Unity UGUI技巧 之 区分鼠标点击UI还是场景物体
1、EventSystem.IsPointerOverGameObject:
1)功能简述
public bool IsPointerOverGameObject();
public bool IsPointerOverGameObject(int pointerId);
pointerId:Pointer (touch / mouse) ID.
Is the pointer with the given ID over an EventSystem object?
If you use IsPointerOverGameObject() without a parameter, it points to the "left mouse button" (pointerId = -1); therefore when you use IsPointerOverGameObject for touch, you should consider passing a pointerId to it.
2)使用举例
using UnityEngine;
using System.Collections;
using UnityEngine.EventSystems;public class MouseExample : MonoBehaviour{
void Update() {
// Check if the left mouse button was clicked
if (Input.GetMouseButtonDown(0))
{
// Check if the mouse was clicked over a UI element
if (EventSystem.current.IsPointerOverGameObject())
{
Debug.Log("Clicked on the UI");
}
}
}
}
1、打开Unity,新建一个工程,具体如下图

2、在场景中,新建一个“Cube”和“Button”,调整各自大小及布局,具体如下图

3、在工程中新建脚本“EventSystemsTest”,双击脚本或者右键“Open C# Project”打开脚本,具体如下图

4、在脚本“EventSystemsTest”上编写代码,在Update函数里,按下鼠标左键,发射一条射线,然后使用“EventSystem.current.IsPointerOverGameObject()”的返回值来判断是碰到UI还是场景物体,其中返回TRUE是碰到UI,具体代码和代码说明图下图

5、“EventSystemsTest”脚本的具体内容如下:
using UnityEngine;
using UnityEngine.EventSystems;
public class EventSystemsTest : MonoBehaviour {
// Update is called once per frame
void Update () {
if (Input.GetMouseButtonDown(0)) {
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
RaycastHit hitInfo;
if (Physics.Raycast(ray, out hitInfo)) {
if (EventSystem.current.IsPointerOverGameObject() == true)
{
Debug.Log(" the UI");
}
else {
Debug.Log(" the Cube");
hitInfo.collider.GetComponent<Renderer>().material.color = Color.red;
}
}
}
}
}
6、脚本编译正确,回到Unity界面,在场景中,新建一个“GameObject”,把脚本“CursorTest”赋给“GameObject”,具体如下图

7、运行场景,在游戏视图中,按下鼠标左键,首先是点击UI的效果,然后是点击场景物体的效果,控制台Console打印,具体如下图


8、到此,《Unity UGUI技巧 之 区分鼠标点击UI还是场景物体》讲解结束,谢谢