问题
I am using UISearchDisplayController when user type a keyword to search , an overlay view covers my view controller. I can not interact with my view controller, until i press the cancel button of search bar. I need to restrict the overlay view frame, so that I can interact with my view controller.
来源：https://stackoverflow.com/questions/28601177/restrict-the-overlay-view-frame-in-uisearchdispalycontroller