作者： CouldHll

问题描述：今天做TAG的时候，加入Parse并加好相应的frame，还是报如下错误：
Undefined symbols for architecture i386:
"_FBTokenInformationExpirationDateKey", referenced from:
-[PFFacebookTokenCachingStrategy cacheTokenInformation:] in Parse(PFFacebookTokenCachingStrategy.o)
-[PFFacebookTokenCachingStrategy expirationDate] in Parse(PFFacebookTokenCachingStrategy.o)
-[PFFacebookTokenCachingStrategy setExpirationDate:] in Parse(PFFacebookTokenCachingStrategy.o)
"_FBTokenInformationTokenKey", referenced from:
-[PFFacebookTokenCachingStrategy accessToken] in Parse(PFFacebookTokenCachingStrategy.o)
-[PFFacebookTokenCachingStrategy setAccessToken:] in Parse(PFFacebookTokenCachingStrategy.o)
"_FBTokenInformationUserFBIDKey", referenced from:
-[PFFacebookTokenCachingStrategy facebookId] in Parse(PFFacebookTokenCachingStrategy.o)
-[PFFacebookTokenCachingStrategy setFacebookId:] in Parse(PFFacebookTokenCachingStrategy.o)
"_OBJC_CLASS_$_FBAppCall", referenced from:
objc-class-ref in Parse(PFFacebookAuthenticationProvider.o)
"_OBJC_CLASS_$_FBRequest", referenced from:
objc-class-ref in Parse(PFFacebookAuthenticationProvider.o)
"_OBJC_CLASS_$_FBSession", referenced from:
objc-class-ref in Parse(PFFacebookAuthenticationProvider.o)
"_OBJC_CLASS_$_FBSessionTokenCachingStrategy", referenced from:
_OBJC_CLASS_$_PFFacebookTokenCachingStrategy in Parse(PFFacebookTokenCachingStrategy.o)
"_OBJC_METACLASS_$_FBSessionTokenCachingStrategy", referenced from:
_OBJC_METACLASS_$_PFFacebookTokenCachingStrategy in Parse(PFFacebookTokenCachingStrategy.o)
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
问题解决：
方法一：加入FaceBookSDK.framework（>1M）
方法二：设置单独的静态库，使用-force_load /path/libname.a来替换之前的配置-all_load _ObjC
方法三：使用CocoaPods安装Parse

我选择了第三种方法，还是CocoaPods好啊