最近有上海市市民反映，上海普陀区宜川路和中潭路之间由于有铁路阻断，当地的居民出行到达中潭路地铁站十分不方便，只能走城市专门为建设的天桥，但是这段天桥被称为“上海难度最高的天桥”，对老人来说很不友好。市
The UISearchDisplayController is very handy and implementing search is pretty straightforward. However, I bump into problem when, in my app, I want to display search result with empty search string b
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