RaycastHit2D.collider

Description

射线命中的碰撞体。

如果命中的对象具有多个碰撞体，这可能会十分有用 - 此属性可以用于确定特定碰撞体而不仅仅是对象。

请注意，返回单个 RaycastHit2D 的某些函数会将碰撞体保留为 NULL，这指示未命中任何对象。RaycastHit2D 实现了一个转换为 bool 的隐式转换运算符，检查此属性时，将其用于确定是否发生命中的简单条件检查。

using UnityEngine;
using System.Collections;

//Attach this script to an empty gameobject.
//When you click on a sprite with a collider it will tell you it's name.
public class ExampleClass : MonoBehaviour
{
    void Update()
    {
        //If the left mouse button is clicked.
        if (Input.GetMouseButtonDown(0))
        {
            //Get the mouse position on the screen and send a raycast into the game world from that position.
            Vector2 worldPoint = Camera.main.ScreenToWorldPoint(Input.mousePosition);
            RaycastHit2D hit = Physics2D.Raycast(worldPoint, Vector2.zero);

            //If something was hit, the RaycastHit2D.collider will not be null.
            if (hit.collider != null)
            {
                Debug.Log(hit.collider.name);
            }
        }
    }
}