unityPC和移动端判断是否点击UI

  //PC端判断
  if (EventSystem.current.IsPointerOverGameObject())
  {
  		//点击UI上面
  }
  else
  {
   	   //点击不在UI上面
  }
  
  //移动端判断  screenPosition=Input.mousePosition
   public bool IsPointerOverGameObject(Vector2 screenPosition)
    {
        if (Input.GetMouseButtonDown(0))
        {
            //实例化点击事件
            PointerEventData eventDataCurrentPosition = new PointerEventData(UnityEngine.EventSystems.EventSystem.current);
            //将点击位置的屏幕坐标赋值给点击事件
            eventDataCurrentPosition.position = new Vector2(screenPosition.x, screenPosition.y);

            List<RaycastResult> results = new List<RaycastResult>();
            //向点击处发射射线
            EventSystem.current.RaycastAll(eventDataCurrentPosition, results);

            return results.Count > 0;
        }
        return false;
    }