为什么这不起作用？我首先FacebookSDK-3.0.8.pkg从链接安装：
https ://developers.facebook.com/ios/downloads/
安装后，我注意到该文件夹是在~/Documents/FacebookSDK/...
我在 XC 4.4.1 和 XC 4.5 B4 中打开示例项目，并得到链接器错误：
ld: framework not found FacebookSDK
clang: error: linker command failed with exit code 1 (use -v to see invocation)
我正在运行 Mountain Lion，并且过去能够编译较旧的 facebook SDK（尽管不是在 Mountain Lion 中）。
然后我安装了 FacebookSDK-3.0.0.pkg 包并得到了相同的结果。
编辑 这是完整的链接器输出：
Ld /Users/kevinw/Library/Developer/Xcode/DerivedData/HelloFacebookSample-amabhzuzewakecehidtetsnstpuu/Build/Products/Debug-iphonesimulator/HelloFacebookSample.app/HelloFacebookSample normal i386
cd /Users/kevinw/Documents/FacebookSDK/Samples/HelloFacebookSample
setenv MACOSX_DEPLOYMENT_TARGET 10.6
setenv PATH "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch i386 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.1.sdk -L/Users/kevinw/Library/Developer/Xcode/DerivedData/HelloFacebookSample-amabhzuzewakecehidtetsnstpuu/Build/Products/Debug-iphonesimulator -F/Users/kevinw/Library/Developer/Xcode/DerivedData/HelloFacebookSample-amabhzuzewakecehidtetsnstpuu/Build/Products/Debug-iphonesimulator -F/Users/kevinw/Documents/FacebookSDK -F/Users/kevinw/Documents/FacebookSDK -filelist /Users/kevinw/Library/Developer/Xcode/DerivedData/HelloFacebookSample-amabhzuzewakecehidtetsnstpuu/Build/Intermediates/HelloFacebookSample.build/Debug-iphonesimulator/HelloFacebookSample.build/Objects-normal/i386/HelloFacebookSample.LinkFileList -mmacosx-version-min=10.6 -Xlinker -objc_abi_version -Xlinker 2 -lsqlite3.0 -fobjc-arc -fobjc-link-runtime -Xlinker -no_implicit_dylibs -D__IPHONE_OS_VERSION_MIN_REQUIRED=40000 -weak_framework Accounts -framework UIKit -framework Foundation -framework CoreGraphics -framework FacebookSDK -framework CoreLocation -o /Users/kevinw/Library/Developer/Xcode/DerivedData/HelloFacebookSample-amabhzuzewakecehidtetsnstpuu/Build/Products/Debug-iphonesimulator/HelloFacebookSample.app/HelloFacebookSample
使固定！
我解决了我的问题。我已经安装了两个3.0.8 SDK and then the 3.0.0 SDK，试图让事情正常工作。我最终决定清理石板并擦拭我的Documents/FacebookSDK文件夹和reinstall just the 3.0.0 version. 擦拭/重新安装后，事情开始工作了！