错误试图从核心数据

Question

检索时，我注意到，这条线是造成问题

NSManagedObject *newContact = [NSEntityDescription insertNewObjectForEntityForName:@"Contacts" inManagedObjectContext:context]; 

错误：

Undefined symbols for architecture i386: 
    "_OBJC_CLASS_$_NSEntityDescription", referenced from: 
     objc-class-ref in LoginViewController.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

您似乎忘记在您的项目设置链接CoreData框架。