xcode 使用 OCUnit 中的核心数据类的 Apple Mach-O 链接器错误
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Apple Mach-O Linker Error using Core Data classes in OCUnit
提问by CGee
OK, here's my code in my test class:
好的，这是我的测试类中的代码：
- (NSManagedObjectContext*)managedObjectContextWithConcurrencyType:(NSManagedObjectContextConcurrencyType)concurrencyType {
NSManagedObjectModel *mom = [NSManagedObjectModel mergedModelFromBundles:nil];
STAssertNotNil(mom, @"Can not create MOM from main bundle");
NSPersistentStoreCoordinator *psc = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:mom];
STAssertNotNil(psc, @"Can not create persistent store coordinator");
NSPersistentStore *store = [psc addPersistentStoreWithType:NSInMemoryStoreType configuration:nil URL:nil options:nil error:0];
STAssertNotNil(store, @"Can not create In-Memory persistent store");
NSManagedObjectContext *moc = [[NSManagedObjectContext alloc] initWithConcurrencyType:concurrencyType];
moc.persistentStoreCoordinator = psc;
return moc;
}
And here's the failure message when trying to use the method in a test method:
这是尝试在测试方法中使用该方法时的失败消息：
Undefined symbols for architecture i386:
"_NSInMemoryStoreType", referenced from:
-[CrosswordItemTests managedObjectContextWithConcurrencyType:] in CrosswordItemTests.o
"_OBJC_CLASS_$_NSEntityDescription", referenced from:
objc-class-ref in CrosswordItemTests.o
"_OBJC_CLASS_$_NSManagedObjectContext", referenced from:
objc-class-ref in CrosswordItemTests.o
"_OBJC_CLASS_$_NSManagedObjectModel", referenced from:
objc-class-ref in CrosswordItemTests.o
"_OBJC_CLASS_$_NSPersistentStoreCoordinator", referenced from:
objc-class-ref in CrosswordItemTests.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I thought I imported the needed classes like that in the .h file:
我以为我在 .h 文件中导入了所需的类：
#import <CoreData/CoreData.h>
What am I missing?
我错过了什么？
回答by Karoly S
In my experience i386 errors tend to come from missing libraries. Its not enough to just #import them in your file, you must also add them to the project libraries. Go into the Project Target -> Build Phases -> Link Binary with Libraries and in your case add the libraries associated with Core Data.
根据我的经验，i386 错误往往来自缺少库。仅在您的文件中#import 它们是不够的，您还必须将它们添加到项目库中。进入 Project Target -> Build Phases -> Link Binary with Libraries 并在您的情况下添加与 Core Data 关联的库。
回答by Stavash
You probably haven't linked the library to the target.
您可能尚未将库链接到目标。
Taken from: http://yannickloriot.com/wp-content/uploads/2012/03/Link-CoreData-Framework-To-The-Project.png
取自：http: //yannickloriot.com/wp-content/uploads/2012/03/Link-CoreData-Framework-To-The-Project.png
回答by Harish Mahajan
Changing 'No Common Blocks' from Yes to No (under Targets->Build Settings->Apple LLVM - Code Generation) fixed the problem. This fixed my problem. Hope it will help to you.
将“No Common Blocks”从 Yes 更改为 No（在 Targets->Build Settings->Apple LLVM - Code Generation 下）修复了该问题。这解决了我的问题。希望对你有帮助。
