在使用Parse的一些相关服务时候，需要下载Parse的SDK,除了需要添加相应的系统框架和库的支持
AudioToolbox.framework
CFNetwork.framework
CoreGraphics.framework
CoreLocation.framework
libz.1.1.3.dylib
MobileCoreServices.framework
QuartzCore.framework
Security.framework
StoreKit.framework
SystemConfiguration.framework
假如你更改导入其他静态库时设置了，Linking下面的Other Linker Flags（比如:我在使用芒果广告平台，配置芒果平台的静态库：点击程序Target文件,选择Build Settings标签页,找到Linking下面的Other Linker Flags,添加参 数-all_load -ObjC。）但是这和Parse静态库设置冲突需要以移除 -ObjC，否则导致如下错误
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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_$_FBRequest", referenced from:
objc-class-ref in Parse(PFFacebookAuthenticationProvider.o)
"_OBJC_CLASS_$_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)
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解决办法一：网上下载FaceBookSDK.framework,加入里面即可解决这些错误(文件比较大)
解决方法二：设置单独的静态库，使用-force_load /path/libname.a 来代替之前需要配置 -all_load _ObjC (比如下图：)
本文转自新风作浪 51CTO博客，原文链接：http://blog.51cto.com/duxinfeng/1285974，如需转载请自行联系原作者