In my SwiftUI app, I have a data from an array. While scrolling through the list, the cells are being recycled, which is great. However, I'm puzzled because it seems that the data isn't being refetched as I scroll, which is contrary to what I expected. I want to understand why the data isn't being refetched for recycled cells and if this is expected behavior. class HistoryViewModel: ObservableObject { @Published var filteredContacts: [HistoryData] = [] func updateFilteredContacts() { filteredContacts = HistoryCallDataService().savedEntities if self.searchText.isEmpty { self.filteredContacts = filteredContacts } else { self.filteredContacts = filteredContacts.filter { contact in contact.firstName?.localizedCaseInsensitiveContains(self.searchText) ?? false || contact.lastName?.localizedCaseInsensitiveContains(self.searchText) ?? false || contact.telephone?.localizedCaseInsensitiveContains(self.searchText) ?? false } } } The List: List{ ForEach(vm.filteredContacts.reversed()) { item in HStack{ VStack(alignment: .leading){ Text("\(item.firstName ?? "N/A") \(item.lastName ?? "N/A" )") .fontWeight(.semibold) Text("\(item.telephone ?? "N/A")") .fontWeight(.medium) .padding(.top,1) } Spacer() VStack(alignment: .trailing){ Text("\(item.time ?? "N/A")") .fontWeight(.medium) Text("\(item.callHidden ? "Hidden" : "Normally ")") .foregroundColor(item.callHidden ? Color.theme.red : Color.theme.black) .fontWeight(.bold) .padding(.top,1) } } } } i attach image: https://im.ezgif.com/tmp/ezgif-1-db6ebe2a2e.gif [https://im.ezgif.com/tmp/ezgif-1-db6ebe2a2e.gif)

I'm facing an issue in my iOS app's architecture involving CoreData, the HistoryCallDataService class, and the HistoryViewModel. I'm hoping someone can help shed light on the problem I'm encountering. Problem Description: I'm working with CoreData and have an array that I'm managing through the HistoryCallDataService class. class HistoryCallDataService { private let container: NSPersistentContainer private let containerName = "CallHistoryData" private let entityName = "HistoryData" @Published var savedEntities: [HistoryData] = [] I'm observing changes in the savedEntities property of the HistoryCallDataService class using the historyDataService.$savedEntities publisher. When the app starts, the array is updated correctly. However, if I add new content, the savedEntities array updates, but the historyArray in the HistoryViewModel does not reflect these changes. import Foundation import Combine class HistoryViewModel: ObservableObject { @Published var searchText:String = "" @Published var historyArray: [HistoryData] = [] private let historyDataService = HistoryCallDataService() private var cancellables = Set<AnyCancellable>() var selectedContact: HistoryData? = nil @Published var filteredContacts: [HistoryData] = [] init(){ addSubscribers() } func addSubscribers(){ historyDataService.$savedEntities .debounce(for: 1.0, scheduler: RunLoop.main) .sink { [weak self] (returnData) in guard let self = self else { return } self.historyArray = returnData self.updateFilteredContacts() } .store(in: &cancellables) } func updateFilteredContacts() { if searchText.isEmpty { filteredContacts = historyArray } else { filteredContacts = historyArray.filter { contact in contact.firstName?.localizedCaseInsensitiveContains(searchText) ?? false || contact.lastName?.localizedCaseInsensitiveContains(searchText) ?? false || contact.telephone?.localizedCaseInsensitiveContains(searchText) ?? false } } } The view: private var contactList: some View{ List{ ForEach(vm.filteredContacts) { item in HStack{ VStack(alignment: .leading){ Text("\(item.firstName ?? "N/A") \(item.lastName ?? "N/A" )") .fontWeight(.semibold) Text("\(item.telephone ?? "N/A")") .fontWeight(.medium) .padding(.top,1) } Spacer() VStack(alignment: .trailing){ Text("\(item.time ?? "N/A")") .fontWeight(.medium) Text("\(item.callHidden ? "Hidden" : "Normally ")") .foregroundColor(item.callHidden ? Color.theme.red : Color.theme.black) .fontWeight(.bold) .padding(.top,1) } } .onTapGesture { vm.selectedContact = item showingCallAlert.toggle() } .listRowBackground(vm.selectedContact?.telephone == item.telephone && showingCallAlert ? Color.theme.gray : nil) } .onDelete(perform: { indexSet in for index in indexSet { let contactToDelete = vm.filteredContacts[index] vm.delete(entity: contactToDelete) } }) } .onChange(of: vm.searchText) { _ in vm.updateFilteredContacts() } .onChange(of: scenePhase) { newPhase in if newPhase == .active { print("Active") vm.updateFilteredContacts() } } .lineLimit(1) .listStyle(.plain) } If anyone has encountered a similar situation or has insights into what might be causing this behavior, I would greatly appreciate your guidance. Thank you in advance for your help!

I want to use Admob in my application - an ad when opening the application only! After many searches, some of which I did not find an answer but i found: As of December 8, 2020, Apple has made it mandatory for developers to release what data is being collected and what it's being used for. If developers don't comply, they won't be able to publish new apps or release updates for current apps. My questions is: According to Apple policies, can Admob be used in the application? and to upload the application, what data does Admob collect and what i need to mark in app store connect?

I have a problem with the search, it doesn't search for each letter individually, these only if it is word is together, for example: I search Kate it will find but if I type Kae (that still has the letters in it), he won't find it, why?    filteredData = contacts.filter {name in         return  name.firstName.lowercased().contains(searchText.lowercased()) || name.lastName.lowercased().contains(searchText.lowercased()) || name.telephone.removeCharacters(from: CharacterSet.decimalDigits.inverted).lowercased().contains(searchText.lowercased())       } i attach screenshot

it want to save QRCode to galley and i get the image but why it not save?? func saveImageQRCode(from string: String) {     filter.message = Data(string.utf8)     if let outputImage = filter.outputImage {       if context.createCGImage(outputImage, from: outputImage.extent) != nil { //        let ge = UIImage(cgImage: cgimg)         let transform = CGAffineTransform(scaleX: 10, y: 10)         let scaledCIImage = outputImage.transformed(by: transform)         let uiimage = UIImage(ciImage: scaledCIImage)                 let imageData = uiimage.pngData()!         let docDir = try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)         let dataNow = "\(Date.now).png"         let imageURL = docDir.appendingPathComponent(dataNow)         try! imageData.write(to: imageURL)                   _ = UIImage(contentsOfFile: imageURL.path)!         UIImageWriteToSavedPhotosAlbum(uiimage, nil, nil, nil)       }     }   }

i do this code: struct TextView: View {       @ObservedObject var service = Service()       @State private var text: String = ""   @FocusState var isInputActive: Bool   var body: some View {     ZStack{                     Color(red: 242 / 255, green: 242 / 255, blue: 247 / 255)         .edgesIgnoringSafeArea(.top)               VStack {         Text("QRCode Text")           .multilineTextAlignment(.center)           .font(.system(size: 30, weight: .heavy, design: .default))           .padding(.top, 16.0)                   TextField("Enter Text", text: $text)           .textFieldStyle(RoundedBorderTextFieldStyle())           .border(Color.white)           .fixedSize(horizontal: false, vertical: true)           .multilineTextAlignment(.center)           .padding()           .frame(width: 350, height: 80)           .background(Rectangle().fill(Color.white).shadow(radius: 20))           .cornerRadius(30)           .frame(height: 100)           .focused($isInputActive)           .toolbar {                     ToolbarItemGroup(placement: .keyboard) {                       Spacer()                       Button("Done") {                         isInputActive = false                       }                     }                   }         Image(uiImage: service.generateQRCode(from: "\(text)"))           .interpolation(.none)           .resizable()           .padding(2.0)           .scaledToFill()           .frame(width: 250, height: 250)                     .fixedSize(horizontal: false, vertical: true)           .multilineTextAlignment(.center)                     .frame(width: 350, height: 350)           .background(Rectangle().fill(Color.white).shadow(radius: 20))           .cornerRadius(30)         Button("Save QRCode") {           print("save")         }         .padding(.vertical, 10.0)         .padding(.horizontal, 100.0)         .background(Color.blue)         .cornerRadius(20)                 .foregroundColor(Color.white)         .frame(height: 100)                   Spacer()       }     }   } } and when i click on textfield and keyboard up, it up all view, why?

i have coredata and i want to add bool Optional but i get error: import CoreData @objc(HistoryData) class HistoryData: NSManagedObject {       @NSManaged var firstName: String   @NSManaged var lastName: String   @NSManaged var telephone: String   @NSManaged var time: String   @NSManaged var callHidden: Bool? // Here the error } Error: Property cannot be marked @NSManaged because its type cannot be represented in Objective-C in xcdatamodeld it selected Optional but it not do it.. why?

How i can open Location services direct to my app? I want it to go to the screen where the user chooses allow location or not can be enabled in the app.. UIApplication.shared.open(URL(string: "App-prefs:LOCATION_SERVICES")!) this code open for me only the location services but how i can open location setting to my app?

I have the code: if let url = URL(string:"tel://\(String(describing: Util.checkForNullString(contactNo)))"), UIApplication.shared.canOpenURL(url){ if #available(iOS 10, *) { UIApplication.shared.open(url) } else { UIApplication.shared.openURL(url) } } how I can detected if user calling or dismiss?

how i make a List like at swiftui at storyboard? the UITableView not the same.. look image: https://i.ibb.co/Qn69TRR/Untitled.png how i can do List like a swiftui in storyboard?

i maked core data and i fetch all data to List. all working (add ,delete) but! if the app inactive (to background) and i open again to delete a row it crashes with error: "Thread 1: "An NSManagedObjectContext cannot delete objects in other contexts." struct HistoryView: View {   @State private var history: [HistoryList] = [HistoryList]()   let coreDM: CoreDataManager       var dateFormatter: DateFormatter {     let formatter = DateFormatter()     formatter.dateFormat = "MM-dd-yyyy HH:mm"     return formatter   }       private func populateHistory(){     history = coreDM.getAllHistory()   }       var body: some View {     NavigationView{       VStack {         if !history.isEmpty {           List {             ForEach(history, id: \.self) { historyList in               HStack {                 Text(dateFormatter.string(from: historyList.dateFlash ?? Date(timeIntervalSinceReferenceDate: 0)))                 Text("\(historyList.timerFlash)s")                   .multilineTextAlignment(.trailing)                   .frame(maxWidth: .infinity, alignment: .trailing)               }             }.onDelete(perform: { indexset in               indexset.forEach { index in                 let history = history[index]                 coreDM.deleteHistory(history: history)                 populateHistory()               }             })           }.refreshable {             populateHistory()             print("## Refresh History List")           }         } else {           Text("History Flashlight is Empty")         }       }       .onAppear {         populateHistory()         print("OnAppear")       }     }.navigationTitle("History Flashlight")       .navigationBarTitleDisplayMode(.inline)   } } struct HistoryView_Previews: PreviewProvider {   static var previews: some View {     HistoryView(coreDM: CoreDataManager())   } } why?

why the setTorchModeOn not working? it not change the level torch     guard let device = AVCaptureDevice.default(for: .video) else { return }     if device.hasTorch {       do {         try device.lockForConfiguration()         try device.setTorchModeOn(level: 0.1)         if on == true {           device.torchMode = .on         } else {           device.torchMode = .off         }         device.unlockForConfiguration()       } catch {         print("Torch could not be used")       }     } else {       print("Torch is not available")     }   }

i have NavigationView in my code i do this for button it Navigation       Button{         print("")       }label: {         Image(systemName: "list.dash")           .foregroundColor(.gray)       }     } how i can navigate to another view when user click the button??

i created a list with colors and i want when the user click red so all the screen was background red, if user click green so full background is green... i don't know why but the var not change..   var body: some View {           NavigationView {       List {         Section {           ScreenColorButtons(text: "Red", color: .red)           ScreenColorButtons(text: "Green", color: .green)           ScreenColorButtons(text: "Blue", color: .blue)         }       }     }   } } struct ScreenColorButtons: View {       @State static var screenSelected: Color = Color.red       var text: String   var color: Color       var body: some View{     Button(action: {       ScreenColorButtons.screenSelected = color       print(ScreenColorButtons.screenSelected)     }, label: {       NavigationLink(text){}     })   } } the ScreenColorView: struct ScreenColorView: View {   @Environment(\.presentationMode) var presentationMode       var body: some View {     Color.ScreenColorButtons.screenSelected   } } why the var not change and error to background??? thank for answer

why when i Swipe the table view the swipe not disappear? see screenshot It just gets stuck like that and won't come back, why?  func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {     let item = realArray[indexPath.row]     let callAction = UIContextualAction(style: .normal, title: "Call Private", handler: { (action, view, success) in       self.service.dialNumber(number: item.telephone, prefixNumber: true)       self.service.setupCallerId(firstName: item.firstName, lastName: item.lastName, telephone: item.telephone)     })     callAction.backgroundColor = .systemGreen     let configuration = UISwipeActionsConfiguration(actions: [callAction])     return configuration   }