北京时间6月6号凌晨，苹果公司发布了新一代头显，相关人员介绍这一头显的售价为3499美元起步，换算成人民币是2.5万左右，近日央广网对此发问，提出了2.5万的头显贵不贵的问题。虽然这一最新的头显设备采用增加摄像头
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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