标签：
http://www.woshipm.com/ucd/144218.html
iOS Human Interface Guideline
https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/MobileHIG/Bars.html
ios AppStore 提交发布上线准备
原文地址：http://www.cnblogs.com/cb168/p/4882183.html
