《项脊轩志》是明代作家归有光的一部回顾性纪年散文。全文以作者青年时期日夜居住的书斋香积轩和家中几代人的人事变动为纬度，真实再现了祖母、母亲和妻子的音容笑貌，也表达了作者对三位故去亲人的深切怀念。
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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