HowToSearchFullCoreDataDatabase我有一个搜索功能，我想搜索我的整个核心数据数据库。我有4个实体，它们都是NSManagedObjectMedicalCode.的子类123456789101112131415161718192021222324252627282930 -(void)loadDatabase  {NSEntityDescription*entityDescription=[NSEntityDescriptionentityForName:@"MedicalCode"inManagedObjectContext:managedObjectContext