Unity 获取鼠标位置下的UGUI或3D物体

总结了两种方法，一种用于UGUI检测，一种用于3D物体检测
第一种返回UGUI的方法
代码如下：

/// <summary>
/// 获取鼠标停留处UI
/// </summary>
/// <param name="canvas"></param>
/// <returns></returns>
public GameObject GetOverUIobj(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;
}

第二种既可以识别UI又可以适用3D物体
代码如下：

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

return null;
}

最后自行测试即可