开始做个记录，逐渐添加~
1：Undefined
symbols for
architecture arm64:
Undefined symbols for architecture arm64:
"_OBJC_CLASS_$_FBSession", referenced from: someFile
ld: symbol(s) not found for architecture arm64解决：
project -> target (your project name) -> build settings and change architectures to standard architectures (armv7, armv7s), and valid architectures to
armv7, armv7s.
参考：http://stackoverflow.com/questions/19213782/undefined-symbols-for-architecture-arm64
2：No
architectures to compile for (ARCHS=arm6 arm7, VALID_ARCHS=armv7)
解决：
-
Go to
ProjectDelete whatever you see there, and then add these rows one by one:
Target > Build Settings > Architecturesarmv6 armv7
There are no 'save' buttons there, so what I do, is adding another blank row, pressing enter, removing it, and then clicking out somewhere else, so that I make sure I have both of them added:
- Now go to the AppName-Info.plist file, and look for the key "Require device capabilities" and delete it all.
3：iOS
使用宏 常量 报错 expected expression
报错的代码：
报错原因：多写了一个分号！
参考：http://www.cnblogs.com/ygm900/p/3472324.html