I am building a Settings screen using Storyboard and UITableViewController with Static Cells. Here is a full view hierarchy and constraints I use for every cell in my Settings Table View: https://cln.sh/tAmFbl The problem appears when I switch portrait mode on landscape mode or switch to device with a smaller screen. Starting to receive an errors like: Ambiguous Layout: Position and size are ambiguous for "Stack View". And: Stack View, need constraints for: X position, width Stack View, need constraints for: Y position, height Here is a picture of the behaviour: https://cln.sh/fq6kOK If I switch back to portrait mode all errors goes away... How can I fix that?

I want to implement a popup notification into my app when data was being updated successfully or not. To do that I: created a .xib file: Screenshot - https://cln.sh/HvEHiX created a class where I load that NIB: import UIKit class PopupView: UIView { static let instance = PopupView() @IBOutlet weak var backgroundView: UIView! @IBOutlet weak var popupView: UIVisualEffectView! @IBOutlet weak var symbol: UIImageView! @IBOutlet weak var titleLabel: UILabel! @IBOutlet weak var descriptionLabel: UILabel! override init(frame: CGRect) { super.init(frame: frame) Bundle.main.loadNibNamed("PopupView", owner: self) popupView.layer.cornerRadius = 20 } required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") } func showPopup(title: String, message: String, symbol: UIImage, on viewController: UIViewController) { self.titleLabel.text = title self.descriptionLabel.text = message self.symbol.image = symbol guard let targetView = viewController.view else { return } backgroundView.frame = targetView.bounds targetView.addSubview(backgroundView) } In the above class I created a showPopup method where defined a backgroundView frame to be equal to ViewController bounds. When I call that method in desired ViewController I receive the behaviour where my popupView shows itself and then went off the screen straight away (black area in the GIF): GIF - https://cln.sh/e4ukf4 Would you be so kind to help me understand and fix the reason why the popupView went off the screen and not just equal to a ViewController bounds.

I have 4 sections, each section have 2 nested rows. I open the rows by tapping on each section. Here is how my initial data looks like. It has title, subtitle and options (which is what nested rows should display): private var sections = [ SortingSection(title: "По имени", subtitle: "Российский рубль", options: ["По возрастанию (А→Я)", "По убыванию (Я→А)"]), SortingSection(title: "По короткому имени", subtitle: "RUB", options: ["По возрастанию (А→Я)", "По убыванию (Я→А)"]), SortingSection(title: "По значению", subtitle: "86,22", options: ["По возрастанию (1→2)", "По убыванию (2→1)"]), SortingSection(title: "Своя", subtitle: "в любом порядке", options: ["Включить"]) ] When I tap on a section I want it accessory (chevron.right, made as UIImageView) be rotated in sync with expanding of nested rows and when I click again the same behaviour for closing. I have a variable called isOpened (bool, false by default), which I change from false to true and back each tap in didSelectRowAt. Based on that a show all nested cells and rotate the UIImageView: override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { if indexPath.row == 0 { sections[indexPath.section].isOpened.toggle() guard let cell = tableView.cellForRow(at: indexPath) as? MainSortTableViewCell else { return } UIView.animate(withDuration: 0.3) { if self.sections[indexPath.section].isOpened { cell.chevronImage.transform = CGAffineTransform(rotationAngle: .pi/2) } else { cell.chevronImage.transform = .identity } } completion: { _ in tableView.reloadSections([indexPath.section], with: .none) } } As you can see above I reload tableView section to show\hide nested rows in a completion block after animation. I can't use reloadSections in an if\else statement because then chevron animation gets skipped. Also my numberOrRowsInSection method: override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { let section = sections[section] if section.isOpened { return section.options.count + 1 } else { return 1 } } Here is how it looks now: https://cln.sh/3hjI2q Here is what I want (any iPhone native apps): https://cln.sh/z0LM6E I tried to add and delete rows instead of reloading the whole section, but always end up with error: UIView.animate(withDuration: 0.3) { if self.sections[indexPath.section].isOpened { cell.chevronImage.transform = CGAffineTransform(rotationAngle: .pi/2) for i in 0..<self.sections[indexPath.section].options.count { tableView.insertRows(at: [IndexPath(row: 1+i, section: indexPath.section)], with: .none) } } else { cell.chevronImage.transform = .identity for i in 0..<self.sections[indexPath.section].options.count { tableView.deleteRows(at: [IndexPath(row: i-1, section: indexPath.section)], with: .none) } } } How can I change my code to solve the task and animate chevron at the same time nested rows expand or close?

I have made an Onboarding View using a collectionView with 2 items. When I change device orientation from landscape to portrait the second item being animated and visible within the first item screen borders. You can see the problem here: https://cln.sh/sgypvH How to fix the animation so when switching from landscape to portrait I could see only the first item content with a white background on the screen? Here is my code for collectionViewLayout: func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize { return CGSize(width: collectionView.frame.width, height: collectionView.frame.height) } Here is the code for willTransition:     override func willTransition(to newCollection: UITraitCollection, with coordinator: UIViewControllerTransitionCoordinator) {         collectionView.collectionViewLayout.invalidateLayout()           let indexPath = IndexPath(item: self.currentPage, section: 0)         DispatchQueue.main.async {             self.collectionView.scrollToItem(at: indexPath, at: .centeredHorizontally, animated: true)         }     } Please let me know if you need anything extra to help me to solve the issue. Thank you!

I have created a User Onboarding as a Collection View with 5 cells (pages). I have 2 types of Collection View Items: welcomeCell which is always a first and single cell in Onboarding (indexPath.item == 0) and tutorialCell (all other cells) which has a tableView and can scroll its content vertically. I want to add the next behaviour: user scrolls tableView content and swipes to the next page if user swipes back to the page he scrolled I want the page layout to be reloaded like it was initially set. For now if a user swipes to the page he scrolled, he will see its position where he ended the scroll. I suggests that collectionView content can be reloaded in didEndDisplaying method: func collectionView(_ collectionView: UICollectionView, didEndDisplaying cell: UICollectionViewCell, forItemAt indexPath: IndexPath) { if indexPath.item != 0 { self.collectionView.reloadItems(at: [indexPath]) } } But with this code I receive a strange cells behaviour: I can swipe up tableView on one page and the came content position will be on another page, but some page can be loaded with normal content position. Here is a GIF: https://cln.sh/wgnjS8 I also tried collectionView.reloadData() in scrollViewDidScroll and scrollViewDidEndDecelerating but receive the similar behaviour. Would you be so kind to share some experience and help to understand what's the best practice for my case? Maybe I should find a way to not reload a page content at all, but reload imageView height anchor in constraints?

I need to make 2 API calls simultaneously. I have 2 URLs for the calls, and if one of the calls will return any error I want to stop all the code execution. How I tried to do it: I have a function called performRequest() with a completion block. I call the function in my ViewController to update the UI - show an error/or a new data if all was successful. Inside it I create a URLSession tasks and then parse JSON: I created an array with 2 urls: func performRequest(_ completion: @escaping (Int?) -> Void) { var urlArray = [URL]() guard let urlOne = URL(string: "https://api.exchangerate.host/latest?base=EUR&places=9&v=1") else { return } guard let urlTwo = URL(string: "https://api.exchangerate.host/2022-05-21?base=EUR&places=9") else { return } urlArray.append(urlOne) urlArray.append(urlTwo) } Then for each of the url inside the array I create a session and a task: urlArray.forEach { url in let session = URLSession(configuration: .ephemeral) let task = session.dataTask(with: url) { data, _, error in if error != nil { guard let error = error as NSError? else { return } completion(error.code) return } if let data = data { let printData = String(data: data, encoding: String.Encoding.utf8) print(printData!) DispatchQueue.main.async { self.parseJSON(with: data) } } } task.resume() } print("all completed") completion(nil) } For now I receive print("all completed") printed once in any situation: if both tasks were ok, if one of them was ok or none of them. What I want is to show the print statement only if all tasks were completed successfully and to stop executing the code if one of them returned with error (for example if we will just delete one of the symbols in url string which will take it impossible to receive a data). How can I do it correctly?

I have implemented a feature, when you press on a UITabBar icon and viewController1 scrolls up using its UIScrollView. It works perfectly, but if I scroll view down and stop somewhere, then switch to another viewController2, then get back to viewController1 and press tabBar icon - the viewController1 will scroll up, but Large Title will never be showed, and I should press tabBar icon one more time to show it: Here is a GIF with behaviour: https://i.stack.imgur.com/VfP4o.gif The code I use for scroll up the VC1: private var biggestTopSafeAreaInset: CGFloat = 0 override func viewSafeAreaInsetsDidChange() { super.viewSafeAreaInsetsDidChange() self.biggestTopSafeAreaInset = max(view.safeAreaInsets.top, biggestTopSafeAreaInset) } func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController) { if tabBarController.selectedIndex == 0 { let navigationVC = viewController as? UINavigationController let firstVC = navigationVC?.viewControllers.first as? CurrencyViewController guard let scrollView = firstVC?.view.subviews.first(where: { $0 is UIScrollView }) as? UIScrollView else { return } if traitCollection.verticalSizeClass == .compact { scrollView.setContentOffset(CGPoint(x: 0, y: -view.safeAreaInsets.top, animated: true) } else { scrollView.setContentOffset(CGPoint(x: 0, y: -biggestTopSafeAreaInset, animated: true) } } } I tried to track biggestTopSafeAreaInset in different stages of VC1 life, but it always has the same number - 196.0. But then why it doesn't scroll till the Large Title after viewControllers switch?

My app used to rely on standard iOS Numpad Keyboard as a textField.inputView. The textField could group typed numbers (1000 -> 1 000, 50067 -> 50 067 etc) and limit the amount of numbers after the decimal point as 2 max: https://i.stack.imgur.com/69LVr.gif (GIF) I've created a custom numpad keyboard view and implement its logic with UITextInput protocol according to that guide on StackOverflow. I can't understand of how to deal with the code I used for grouping and limit numbers with standard iOS Numpad. Because it doesn't work properly after I type numbers from my new custom Numpad (only 2 numbers): https://i.stack.imgur.com/f3u3n.gif (GIF) The code I use for grouping and limit numbers after decimal point in a textField: func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool { let formatter = NumberFormatter() formatter.numberStyle = .decimal formatter.groupingSeparator = " " formatter.maximumFractionDigits = 2 let textString = textField.text ?? "" guard let range = Range(range, in: string) else { return false } let updatedString = textString.replacingCharacters(in: range, with: string) let correctDecimalString = updatedString.replacingOccurrences(of: ",", with: ".") let completeString = correctDecimalString.replacingOccurrences(of: formatter.groupingSeparator, with: "") guard completeString.count <= 12 else { return false } guard !completeString.isEmpty else { return true } textField.text = completeString return string == formatter.decimalSeparator } Custom NumpadView: class NumpadView: UIView { var target: UITextInput? init(target: UITextInput) { super.init(frame: .zero) self.target = target initializeSubview() } required init?(coder: NSCoder) { super.init(coder: coder) initializeSubview() } func initializeSubview() { let xibFileName = "NumpadView" let view = Bundle.main.loadNibNamed(xibFileName, owner: self, options: nil)![0] as! UIView self.addSubview(view) view.frame = self.bounds self.autoresizingMask = [.flexibleWidth, .flexibleHeight] } @IBAction func buttonPressed(_ sender: NumpadButton) { insertText((sender.titleLabel!.text)!) } func insertText(_ string: String) { guard let range = target?.selectedRange else { return } if let textField = target as? UITextField, textField.delegate?.textField?(textField, shouldChangeCharactersIn: range, replacementString: string) == false { return } target?.insertText(string) } } extension UITextInput { var selectedRange: NSRange? { guard let selectedRange = selectedTextRange else { return nil } let location = offset(from: beginningOfDocument, to: selectedRange.start) let length = offset(from: selectedRange.start, to: selectedRange.end) return NSRange(location: location, length: length) } } 2.How I initialize it in a VC: override func viewDidLoad() { super.viewDidLoad() textField.delegate = self textField.inputView = NumpadView(target: textField) } Test project on GitHub: CLICK What should I do so the code in shouldChangeCharactersIn method work for my custom Numpad?

I have a custom textField's input view - it is a Numpad style keyboard. Numpad is using to add numbers and math symbols to a textField. I can't figure out how can I change a math symbol in a string if user already add one and wants to change it on another straight away. Here is an example of what I need: https://i.stack.imgur.com/IVGId.gif Here is the code I use: func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool { //number formatter let formatter = NumberFormatter() formatter.numberStyle = .decimal formatter.maximumFractionDigits = 2 formatter.locale = .current formatter.roundingMode = .down //all possible math operation symbols user can add let symbolsSet = Set(["+","-","x","/"]) var amountOfSymbols = 0 let numberString = textField.text ?? "" guard let range = Range(range, in: numberString) else { return false } let updatedString = numberString.replacingCharacters(in: range, with: string) let correctDecimalString = updatedString.replacingOccurrences(of: formatter.groupingSeparator, with: "") let completeString = correctDecimalString.replacingOccurrences(of: formatter.decimalSeparator, with: ".") //current math symbol user add let symbol = symbolsSet.filter(completeString.contains).last ?? "" //if user add math symbol to an empty string - do not insert if string == symbol, numberString.count == 0 { return false } //count how much math symbols string has. If more that one - do not insert, string can have only one completeString.forEach { character in if symbolsSet.contains(String(character)) { amountOfSymbols += 1 } } if amountOfSymbols > 1 { return false } //count how much decimals string has. If more that one - do not insert because it can have only one per number let numbersArray = completeString.components(separatedBy: symbol) for number in numbersArray { let amountOfDecimalSigns = number.filter({$0 == "."}).count if amountOfDecimalSigns > 1 { return false } } //create numbers from a string guard let firstNumber = Double(String(numbersArray.first ?? "0")) else { return true } guard let secondNumber = Double(String(numbersArray.last ?? "0")) else { return true } //format numbers and turn them back to string let firstFormattedNumber = formatter.string(for: firstNumber) ?? "" let secondFormattedNumber = formatter.string(for: secondNumber) ?? "" //assign formatted numbers to a textField textField.text = completeString.contains(symbol) ? "\(firstFormattedNumber)\(symbol)\(secondFormattedNumber)" : "\(firstFormattedNumber)" return string == formatter.decimalSeparator } The logic for me was to use textField.deleteBackwards() method to delete an old one and add a new math symbol after, but with above code it doesn't work: it deletes symbol, but a new one doesn't appear - I should press again so new symbol can appear. What should I do to change a math symbol in a string? Test project on GitHub

I have a textField where I can type numbers (2 333,44) or simple math equations (12+3, 11x3,5). For now I can modify the textField.text with adding a new string only to the end of existing text. If I move cursor to any position inside number it will add a new character only at the end: https://i.stack.imgur.com/HzaA9.gif How to modify the code to insert new characters at any cursor position? My current code from shouldChangeCharactersIn: func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool { let formatter = NumberFormatter() formatter.numberStyle = .decimal formatter.maximumFractionDigits = 2 formatter.minimumFractionDigits = 1 formatter.locale = .current formatter.roundingMode = .down let numberString = "\(textField.text ?? "")".replacingOccurrences(of: formatter.groupingSeparator, with: "") let lastCharacter = numberString.last ?? "." var symbol: String { var tempArray = [String]() let mathSymbols = "+-÷x" for character in numberString { if mathSymbols.contains(character) { tempArray.append(String(character)) } } return tempArray.last ?? "" } var numbersArray: [String] { if numberString.first == "-" { let positiveString = numberString.dropFirst() var tempArray = positiveString.components(separatedBy: symbol) tempArray[0] = "-\(tempArray[0])" return tempArray } else { return numberString.components(separatedBy: symbol) } } //turn numbers into Float and create a String from them to be able to receive a correct result from NSExpression var floatNumberArray: [Float] { if numberString.first == "-" { let tempString = lastCharacter == Character(formatter.decimalSeparator) ? numberString.dropFirst().dropLast() : numberString.dropFirst() var tempArray = tempString.components(separatedBy: symbol) tempArray[0] = "-\(tempArray[0])" return tempArray.compactMap { Float($0.replacingOccurrences(of: formatter.decimalSeparator, with: ".")) } } else { return numberString.components(separatedBy: symbol).compactMap { Float($0.replacingOccurrences(of: formatter.decimalSeparator, with: ".")) } } } var floatNumberString: String { if numberString.contains("x") { return "\(floatNumberArray.first ?? 0)\("*")\(floatNumberArray.last ?? 0)" } else if numberString.contains("÷") { return "\(floatNumberArray.first ?? 0)\("/")\(floatNumberArray.last ?? 0)" } else { return "\(floatNumberArray.first ?? 0)\(symbol)\(floatNumberArray.last ?? 0)" } } let amountOfDecimals = "\(numbersArray.last ?? "")\(string)".filter({ $0 == Character(formatter.decimalSeparator) }).count //allow to insert 0 after the decimal symbol to avoid formatting i.e. 2.04 formatter.minimumFractionDigits = numberString.last == Character(formatter.decimalSeparator) && string == "0" ? 1 : 0 //allow string to be modified by backspace button if string == "" { return false } //allow numbers as a first character, except math symbols if numberString == "" { if Character(string).isNumber { textField.text = string } else { return false } } //allow only one decimal symbol per number else if amountOfDecimals > 1 { return false } if numbersArray.count > 1 { //if number is entered if Character(string).isNumber { textField.text = "\(formatter.string(for: Double("\(numbersArray.first?.replacingOccurrences(of: formatter.decimalSeparator, with: ".") ?? "")") ?? 0) ?? "")\(symbol)\(formatter.string(for: Double("\(numbersArray.last?.replacingOccurrences(of: formatter.decimalSeparator, with: ".") ?? "")\(string)") ?? 0) ?? "")" //if symbol is entered } else if string == formatter.decimalSeparator { textField.text = "\(textField.text ?? "")\(string)" } else { //perform calculation if last entered character is a number if lastCharacter.isNumber { let result = performCalculation(format: floatNumberString) textField.text = string == "=" ? "\(formatter.string(from: result) ?? "")" : "\(formatter.string(from: result) ?? "")\(string)" //perform calculation if last entered character is a decimal symbol } else if lastCharacter == Character(formatter.decimalSeparator) { let result = performCalculation(format: floatNumberString) textField.text = string == "=" ? "\(formatter.string(from: result) ?? "")" : "\(formatter.string(from: result) ?? "")\(string)" //change math symbol before enter a second number } else { textField.text = "\(textField.text?.dropLast() ?? "")\(string)" } } } else { //if number is entered if Character(string).isNumber { textField.text = "\(formatter.string(for: Double("\(numbersArray.first?.replacingOccurrences(of: formatter.decimalSeparator, with: ".") ?? "")\(string)") ?? 0) ?? "")" } else { //if math symbol is entered if lastCharacter.isNumber { textField.text = "\(textField.text ?? "")\(string)" } } } return false } func performCalculation(format: String) -> NSNumber { let expression = NSExpression(format: format) let answer = expression.expressionValue(with: nil, context: nil) return answer as! NSNumber } } My guess is to modify the string with a range. So I tried: 1.Create range let numberString = "\(textField.text ?? "")".replacingOccurrences(of: formatter.groupingSeparator, with: "") guard let range = Range(range, in: numberString) else { return false } 2.Remove string at the end and use range instead } else { //if number is entered if Character(string).isNumber { textField.text = "\(formatter.string(for: Double("\(numbersArray.first?.replacingOccurrences(of: formatter.decimalSeparator, with: ".").replacingCharacters(in: range, with: string) ?? "") ?? "")") ?? 0) ?? "")" } else { //if math symbol is entered if lastCharacter.isNumber { textField.text = "\(textField.text?.replacingCharacters(in: range, with: string) ?? "") ?? "")" } } } return false } 3.Then I can insert at any position but can add only 4 numbers if add from keyboard and insert more from another cursor position: https://i.stack.imgur.com/iDV4n.gif Test project on GitHub

Hi Everyone. Can anybody give me a tip where to look for solving this wrong app icon display in Launchpad. I created an .icns file with all needed icon sizes according to Apple guide but after manually implementing this file into the app I received that this new icon displays bigger than others in Launchpad. How to fix that?

I have 2 ViewControllers: VC1 populates its tableView based on CoreData attribute isPicked, which is bool and show only items with true state. VC2 is a second Modal (not Full Screen) View Controller which allow user to change the state of isPicked attribute: check and uncheck item (make it true or false). The idea is user picks needed items end dismiss the VC2 and the items should appear in VC1. I have implemented NSFetchedResultsController to both VC1 and VC2. And as soon as I press on first item (i.e. change isPicked state to true) I receive the error from VC1: [error] fault: Serious application error. An exception was caught from the delegate of NSFetchedResultsController during a call to -controllerDidChangeContent:. Invalid update: invalid number of rows in section 0. The number of rows contained in an existing section after the update (2) must be equal to the number of rows contained in that section before the update (1), plus or minus the number of rows inserted or deleted from that section (0 inserted, 0 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out). Here is how I change a state of item in VC2 (true\false): guard let currencyArray = fetchedResultsController.fetchedObjects else { return } let cell = tableView.cellForRow(at: indexPath) as! PickCurrencyTableViewCell for currency in currencyArray { if currency.shortName == cell.shortName.text { currency.isPicked = !currency.isPicked coreDataManager.save() } } } Here is my VC1 NSFetchedResultsController implementation: super.viewDidLoad() setupFetchedResultsController() } func setupFetchedResultsController() { let predicate = NSPredicate(format: "isForConverter == YES") fetchedResultsController = createCurrencyFetchedResultsController(and: predicate) fetchedResultsController.delegate = self try? fetchedResultsController.performFetch() } func createCurrencyFetchedResultsController(with request: NSFetchRequest<Currency> = Currency.fetchRequest(), and predicate: NSPredicate? = nil, sortDescriptor: [NSSortDescriptor] = [NSSortDescriptor(key: "shortName", ascending: true)]) -> NSFetchedResultsController<Currency> { request.predicate = predicate request.sortDescriptors = sortDescriptor return NSFetchedResultsController(fetchRequest: request, managedObjectContext: context, sectionNameKeyPath: nil, cacheName: nil) } Here is my VC1 NSFetchedResultsController delegate: func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) { tableView.beginUpdates() } func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) { tableView.endUpdates() } func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) { if let indexPath = indexPath, let newIndexPath = newIndexPath { switch type { case .update: tableView.reloadRows(at: [indexPath], with: .none) case .move: tableView.moveRow(at: indexPath, to: newIndexPath) case .delete: tableView.deleteRows(at: [indexPath], with: .none) case .insert: tableView.insertRows(at: [indexPath], with: .none) default: tableView.reloadData() } } } } And finally my VC1 Table View methods: override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { let currency = fetchedResultsController.sections![section] return currency.numberOfObjects } override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCell(withIdentifier: "converterCell", for: indexPath) as! ConverterTableViewCell let currency = fetchedResultsController.object(at: indexPath) cell.shortName.text = currency.shortName cell.fullName.text = currency.fullName return cell } When I reload the app, picked item shows itself in VC1 (which caused crash). But every change in VC2 crashes the app again with the same error. I don't have any methods to delete items in VC1 or so. I need that VC1 tableView just show or hide items according to isPicked state made from VC2. What I missed in my code?

I have 1 UIViewController with a type of CustomTableView and 1 UITableViewController with a type of usual UITableView. Both conform to NSFetchedResultsControllerDelegate and implemented its delegate methods with the repeated code. For now it's in extensions. Is it possible to move that code out to a separate swift file? I tried to move it to separate file with class NSFetchedResultsView, but when I copy that delegate methods to the new file, it doesn't know anything about tableView inside it's methods... How can I separate that methods properly? Delegate methods I want to separate: func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) { tableView.beginUpdates() } func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) { tableView.endUpdates() } func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) { switch type { case .update: if let indexPath = indexPath { tableView.reloadRows(at: [indexPath], with: .none) } case .move: if let indexPath = indexPath, let newIndexPath = newIndexPath { tableView.moveRow(at: indexPath, to: newIndexPath) } case .delete: if let indexPath = indexPath { tableView.deleteRows(at: [indexPath], with: .none) } case .insert: if let newIndexPath = newIndexPath { tableView.insertRows(at: [newIndexPath], with: .none) } default: tableView.reloadData() } }

I have a UITableViewController and a Prototype cell with a UITextField. When I change a textField.text in one of the cells I want it to be changed in all other cells which my tableView now have (for example multiply number by 2). This is the behaviour I want to implement: https://cln.sh/xjw5Od (short video) Should I trigger a certain textField delegate method or it should be made in another way? My code for now: override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { cell.numberTextField.delegate = self } //Delegate methods func textFieldDidBeginEditing(_ textField: UITextField) { textField.text = "" textField.textColor = UIColor.systemBlue } func textFieldDidEndEditing(_ textField: UITextField, reason: UITextField.DidEndEditingReason) { textField.text = "0" textField.textColor = UIColor.black }

I have a UITableView which populate it cells with a NSFetchedResultsController based on CoreData attribute isForConverter which is Bool and should be true to be displayed. isForConverter state sets in another ViewController. When I want to delete some cells from the UITableView and after access cells which wasn't deleted I receive the error: *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'no object at index 5 in section at index 0' There is a GIF with the problem: https://cln.sh/M1aI9Z My code for deleting cells. I don't need to delete it from database, just change it isForConverter from true to false: override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) { if editingStyle == .delete { let currency = fetchedResultsController.object(at: indexPath) currency.isForConverter = false coreDataManager.save() } } NSFetchedResultsController Setup and delegates: func setupFetchedResultsController() { let predicate = NSPredicate(format: "isForConverter == YES") fetchedResultsController = coreDataManager.createCurrencyFetchedResultsController(with: predicate) fetchedResultsController.delegate = self try? fetchedResultsController.performFetch() } func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) { tableView.beginUpdates() } func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) { tableView.endUpdates() } func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) { switch type { case .update: if let indexPath = indexPath { tableView.reloadRows(at: [indexPath], with: .none) } case .move: if let indexPath = indexPath, let newIndexPath = newIndexPath { tableView.moveRow(at: indexPath, to: newIndexPath) } case .delete: if let indexPath = indexPath { tableView.deleteRows(at: [indexPath], with: .none) } case .insert: if let newIndexPath = newIndexPath { tableView.insertRows(at: [newIndexPath], with: .none) } default: tableView.reloadData() } } } I noticed that if I just add tableView.reloadData() to tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) then everything works good. But deletion animation is really fast and antsy. Also according to docs I should not use tableView.reloadData() with NSFetchedResultsController... How to fix that behaviour?