http://stackoverflow.com/questions/13040652/stdterminate-undefined-in-cocoa-apphttp://stackoverflow.com/questions/37186967/undefined-symbols-for-architecture-x86-64-stdterminate-referenced-from同是解决引入c
https有关的警告，App Transport Security has blocked a cleartext HTTP (http://) resource load since it is insecure. Temporary exceptions can be configured via your app's Info.plist file.答案当然是否，
一次给了下面两条警告（精彩吧）： Presenting view controllers on detached view controllers is discouraged Unbalanced calls to begin/end appearance transitions for <UITabBarController: 0x7fc046131d7
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