使用OCUnit中的核心数据类的Apple Mach-O链接器错误

Question

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;
}

尝试在测试方法中使用该方法时，这是失败消息：

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)

我以为我在.h文件中导入了所需的类：

#import <CoreData/CoreData.h>

我错过了什么？

Answer 1

根据我的经验，i386错误往往来自缺失的库。仅仅#import它们在你的文件中是不够的，你还必须将它们添加到项目库中。进入项目目标 - ＆gt;构建阶段 - ＆gt;将Binary与Libraries链接，并在您的情况下添加与Core Data相关联的库。

Answer 2

您可能尚未将库链接到目标。

取自：http://yannickloriot.com/wp-content/uploads/2012/03/Link-CoreData-Framework-To-The-Project.png

Answer 3

更改＆＃39;没有通用块＆＃39;从Yes到No（在Targets-＆gt; Build Settings-＆gt; Apple LLVM - Code Generation）下解决了这个问题。 这解决了我的问题。希望它对你有所帮助。