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
使用命令行编译，创建main.m文件，写个NSLog语句（需要Foundation头文件），用clang编译不过。解决办法是：clang -framework Foundation main.m -o main，或者-fmodules Foundation（代码中用@import Foundation; 而不是#import <Foundation/Foundation.h>文本搜索选
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