上海有一家夜店，突然就出现一大群的阿姨，这些阿姨穿着运动服，在DJ的带领下开始跳广场舞。这些阿姨都是附近的居民，平时一直都在公园里面跳舞，但最近一段时间即将迎来高考，阿姨们不想要去影响到学生，就决定来到
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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