Hi Brian, Thanks for the amazing course. I have a question. When using NSFetchedResultsController the trick to toggle the height of heightForFooterInSection to display a “no rows message” no longer works because when the Object is empty the section also doesn't exist. Is there a way to solve this?

HI Brain, When I modify companies' name, such as from 'A' to 'Z', the row of the company did move to the bottom, but the name keeps no change. What I found is that the new name did update to Core Data, but somehow the NSFetchedResultsController treads this change as '.move' only, so I have to add 'tableView.reloadData()` at the end of '.move' case, like below: ``` func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) { print("type: \(type.rawValue) indexPath: \(indexPath!) newIndexPath: \(newIndexPath!)") switch type { case .insert: tableView.insertRows(at: [newIndexPath!], with: .fade) case .delete: tableView.deleteRows(at: [indexPath!], with: .fade) case .update: tableView.reloadRows(at: [indexPath!], with: .fade) case .move: tableView.moveRow(at: indexPath!, to: newIndexPath!) tableView.reloadData() } } ``` I am sure this is not a proper fix, what is your suggestion? Paul

Hi Brain, Sorry for having many questions. I spent quite long time to figure out how to save the company photos. It does work now, but I am not sure if it is efficient. Basically, my idea is to loop through jsonCompanies, downloading imageData as first step, and then put everything inside main thread. Inside main thread, memerise how many companies have been proceessed and onee it equal to number of jsonCompany inside jsonCompanies, do context.save(). the `downloadCompaniesFromServer` should be inside `Service.swift` ``` func downloadCompaniesFromServer(){ print("downloadCompaniesFromServer") let privateContext = NSManagedObjectContext(concurrencyType: .privateQueueConcurrencyType) privateContext.parent = CoreDataManager.shared.persistenContainer.viewContext if let url = URL(string: urlString) { URLSession.shared.dataTask(with: url) { (data, response, error) in if let err = error { print("Failed to download companies", err) return } guard let data = data else { return } let jsonDecoder = JSONDecoder() do { let jsonCompanies = try jsonDecoder.decode([JSONCompany].self, from: data) let numberOfCompanies = jsonCompanies.count var processed = 0 jsonCompanies.forEach({ (jsonCompany) in print(jsonCompany.name) if let url = URL(string: jsonCompany.photoUrl) { URLSession.shared.dataTask(with: url, completionHandler: { (data, response, error) in if let err = error { print(err) return } DispatchQueue.main.async { let company = Company(context: privateContext) company.name = jsonCompany.name print("get photo url for \(company.name!)") company.founded = Date.get(dateString: jsonCompany.founded, format: "MM/dd/yyyy") company.imageData = data if let nsData = data as NSData? { CompanyCell.imageCache.setObject(nsData, forKey: company.name as NSString!) print("save imageData for \(company.name!)") } jsonCompany.employees?.forEach({ (jsonEmployee) in print(" - \(jsonEmployee.name)") let employee = Employee(context: privateContext) employee.name = jsonEmployee.name employee.type = jsonEmployee.type employee.detail = EmployeeInformation(context: privateContext) employee.detail?.birthday = Date.get(dateString: jsonEmployee.birthday, format: "MM/dd/yyyy") employee.company = company }) processed += 1 if processed >= numberOfCompanies { do { try privateContext.save() try privateContext.parent?.save() print("context saved") }catch let err { print(err) } } } }).resume() } }) }catch let err { print(err) } }.resume() } } ```

Hello Brian, Please what's the most effective way to save unique objects in Core Data, or most effective way to check if an object already exists of not. My first solution was to perform a fetch request and check against the result when I want to add a new object, if it exists, i don't save, else save, how effective is this?

So we spend time cleaning the code into helper files now its all back in a vc. can we still put the tableview stuff into an extension?

Brian I am at a loss to follow this. Why aren't the edit and delete buttons in the table row as swipe action. What has happened to the insert new company view controller. Very disappointed.

Hi where i can find link to code that you copy and paste to CompaniesAutoUpdateController.swift ?

Hi Brian, Since the EmployeesController is similar to CompaniesController, is it possible to use FRC in EmployeesController as well? Are there any specific difficulties in doing so?

Hi Brian, This is my first question, I really hope you can help. I love the auto UI updates but please am currently using it with collectionview using perform batch updates. Please is there a way to paginate safely without hitting cellForItemAt and executing my logic for paginating: if indexPath.item == (fetchResultsController.fetchedObjects?.count)! - 1 && !isfinishedPaging Or is there a way to know when the blockoperations is done with all batches or the sections it ran: collectionView?.performBatchUpdates({ for operation in self.blockOperations{ operation.start() } }, completion: { (isComplete) in //not this completion, as this runs for every individual updates Your response will be greatly appreciated. Thanks. })

Great Lesson , Thanks.

Your videos don't reliably play, sometimes getting stuck in a never ending buffering state.

Man... this video took me three days to get through. Thats the longest I ever took for any of Brian's videos. Good stuff tho! Keeping pumping that fire.

Hi brian, I am using fetchlimit with NSFetchedResultsController but the issue is displaying like it in the collectionview 5 4 3 2 1 and i need it in reverse 1 2 3 4 5 What is the solution without using nssortdescriptor because i already used it but not solve

Great video Brian! You are really the messiah of iOS development. Keep it coming. I'm sure one day your educational venture is going to blow up to be the best in iOS programming. There is honestly no one who does the job you do.