iphone - 创建核心数据文件后出错

Question

我已经开始将核心数据添加到我的应用程序中。我创建了名为 Assets 的实体并定义了它的四个属性，然后为 NSManagedObject 创建了 Asset.h 和 Asset.m 文件。现在我收到以下错误，而在此之前我的应用程序运行良好

Ld /Users/Omer/Library/Developer/Xcode/DerivedData/LoginTest-enoqygjnncuapjescysdafbighag/Build/Products/Debug-iphonesimulator/LoginTest.app/LoginTest normal i386
cd /Users/Omer/Desktop/Docs/LoginTest
setenv MACOSX_DEPLOYMENT_TARGET 10.6
setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/clang -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk -L/Users/Omer/Library/Developer/Xcode/DerivedData/LoginTest-enoqygjnncuapjescysdafbighag/Build/Products/Debug-iphonesimulator -L/Users/Omer/Desktop/Docs/LoginTest/ZBarSDK -F/Users/Omer/Library/Developer/Xcode/DerivedData/LoginTest-enoqygjnncuapjescysdafbighag/Build/Products/Debug-iphonesimulator -filelist /Users/Omer/Library/Developer/Xcode/DerivedData/LoginTest-enoqygjnncuapjescysdafbighag/Build/Intermediates/LoginTest.build/Debug-iphonesimulator/LoginTest.build/Objects-normal/i386/LoginTest.LinkFileList -mmacosx-version-min=10.6 -Xlinker -objc_abi_version -Xlinker 2 -Xlinker -no_implicit_dylibs -D__IPHONE_OS_VERSION_MIN_REQUIRED=50000 -liconv -framework QuartzCore -framework CoreVideo -framework CoreMedia -framework AVFoundation -framework MapKit -framework CoreLocation -lz -framework CoreGraphics -framework MobileCoreServices -framework SystemConfiguration -framework CFNetwork -framework Foundation -framework UIKit -lzbar -o /Users/Omer/Library/Developer/Xcode/DerivedData/LoginTest-enoqygjnncuapjescysdafbighag/Build/Products/Debug-iphonesimulator/LoginTest.app/LoginTest


Undefined symbols for architecture i386:


 "_OBJC_METACLASS_$_NSManagedObject", referenced from:
  _OBJC_METACLASS_$_Asset in Asset.o


 "_OBJC_CLASS_$_NSManagedObject", referenced from:
  _OBJC_CLASS_$_Asset in Asset.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Answer 1

请包含 coreData 框架 ...