unity API 之EventSystem.current.IsPointerOverGameObject()

using UnityEngine;              
using System.Collections;
using UnityEngine.EventSystems;      //备上空间名

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())    //检测是否点击了UI上的物件，返会bool值
            {
                Debug.Log("Clicked on the UI");
            }
        }
    }
}

当使用触屏时，官方给出了另外一份代码

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

public class TouchExample : MonoBehaviour
{
    void Update()
    {
        // Check if there is a touch
        if (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Began)       //检测手值的触碰
       
            // Check if finger is over a UI element
            if (EventSystem.current.IsPointerOverGameObject(Input.GetTouch(0).fingerId))   //监视是否触碰UI
            {
                Debug.Log("Touched the UI");
            }
        }
    }
}

总结：可以用此API避免在画面中点击到UI的物件又同时点到Game中的物件触发的一些情况;在触屏中可以判断点击的手指并执行相应的函数事件。