Is it a SwiftUI project ?

I filed a bug report Nov 2, 2021 at 5:53 PM – FB9735861

I do not get any errors Are you sure ? There is an error in your code: There misses a closing curly bracket at the end of struct Knowledge: Identifiable, Codable { addCard() is never called. Where and how do you add card ? What is your problem ? What do you get ? What do you expect ? So, to get something on screen, I created 2 knowledge in code, so that knowledgeArray is no more empty: init() { if let savedItems = UserDefaults.standard.data(forKey: "KnowledgeItems") { if let decodedItems = try? JSONDecoder().decode([Knowledge].self, from: savedItems) { knowledgeArray = decodedItems return } } let someKnowledge1 = Knowledge(id: UUID(), term: "First") let someKnowledge2 = Knowledge(id: UUID(), term: "Second") knowledgeArray = [someKnowledge1, someKnowledge2] }

You need also to save to UserDefaults. With code like: let encoder = JSONEncoder() if let encoded = try? encoder.encode(knowledgeArray) { let defaults = UserDefaults.standard defaults.set(encoded, forKey: "KnowledgeItems") }

You misused Environment Object. This should work: struct Knowledge: Identifiable, Codable { var id = UUID() var term: String var explanation: String? var tags: String? } class Deck: ObservableObject { @Published var knowledgeArray : [Knowledge] = [] init() { if let savedItems = UserDefaults.standard.data(forKey: "KnowledgeItems") { if let decodedItems = try? JSONDecoder().decode([Knowledge].self, from: savedItems) { knowledgeArray = decodedItems return } } knowledgeArray = [] } } struct AddCard: View { @Environment(\.presentationMode) var presentationMode @Environment(\.dismiss) var dismiss @State private var terms = "" @State private var tags = "" @State private var explanations = "" // @StateObject @EnvironmentObject var KN: Deck var body: some View { VStack { Form { TextField("Term", text: $terms) TextField("Explanation", text: $explanations) TextField("Tag", text: $tags) } Button("Save") { let item = Knowledge(term: terms, explanation: explanations , tags: tags) KN.knowledgeArray.append(item) let encoder = JSONEncoder() if let encoded = try? encoder.encode(KN.knowledgeArray) { let defaults = UserDefaults.standard defaults.set(encoded, forKey: "KnowledgeItems") } self.presentationMode.wrappedValue.dismiss() print("Button is working") } .padding() } } } struct cardList: View { @ObservedObject var decks = Deck() @State private var showingaddCard = false var body: some View { NavigationView { List { ForEach(decks.knowledgeArray) { cardName in Text(cardName.term) .font(.title) } .onDelete(perform: removeItems) } .toolbar { Button { showingaddCard = true } label: { Image(systemName: "plus") } } .navigationTitle("Card List") } .sheet(isPresented: $showingaddCard) { AddCard().environmentObject(decks) } } func removeItems(at offsets: IndexSet) { decks.knowledgeArray.remove(atOffsets: offsets) } }

You have to use Xcode, to develop either in Objective C or Swift (IMO, recommended). Then, to build the User Interface, you can choose UIKit (my preference) or SwiftUI (which I find harder to use). You have several tutorials from Apple : Intro to App development with Swift.

How much free storage available ? Repeated issues due to insufficient space: https://developer.apple.com/forums/thread/683104 I got this error with 15.1 and i had around 4 GB of space left after downloading the update, i deleted some apps so i had 10GB available and then i could install the update. Downloaded the new update and tried to install. I had about 4GB of space available after the download. I tried repeatedly to install the same but to no avail. I came upon this discussion and it was helpful. The post by AshishRajpal91 was the one to go with. I deleted a few apps and had about 6GB space and then tried again. I am now posting this reply post installation of ios 15. Have a nice day guys.

This should help you: https://stackoverflow.com/questions/25294011/access-email-in-ekparticipant-ekattendee

I don't understand what are my app, and 'special' Application Did you develop the special application ? Or is it a third party ? Then what is the link between the 2 ?

I try to run the program after putting Text("25%") in. Any ideas!  No ! How could we guess where you put Text("25%") ???? Please show the code.

What is the name of the class where you want to declare the IBOutlet ? What is the class of the ViewController in which you have define the Label in storyboard ? They must be exactly the same: In this example you see: the class is named FirstViewController When you select the corresponding viewController in storyboard, you in Identity Inspector that its class is FirstViewController (and not the default UIViewController) That allowed to create a UILabel by control-drag from the Label in the view in the storyboard. Have you checked that the 2 names are exactly the same ?

I would do something like this: struct Option: Decodable, Hashable { var userCode: String var optType: String var optValue: String } struct Selected: Decodable, Hashable { var userCode: String var tradeCode: String var optType: String var optValue: String } struct ContentView: View { @State var options = [ Option(userCode: "1", optType: "Emotions", optValue: "Sad"), Option(userCode: "1", optType: "Emotions", optValue: "Happy"), Option(userCode: "1", optType: "Emotions", optValue: "Angry"), Option(userCode: "1", optType: "Emotions", optValue: "Calm") ] @State var selected = [ Selected(userCode: "1", tradeCode: "1", optType: "Emotions", optValue: "Sad"), Selected(userCode: "1", tradeCode: "1", optType: "Emotions", optValue: "Happy") ] var body: some View { Button("Options Not Selected") { let notSelectedOptions = options.filter() { !isOptionInSelected(for: $0) } print(notSelectedOptions) // Just to check // Here I need an array of the options NOT selected } } func isOptionInSelected(for option: Option) -> Bool { for select in selected { if option.userCode == select.userCode && option.optType == select.optType && option.optValue == select.optValue { return true } } return false } }

What is it that doesn't work ? AFAIK, when you submit a new release of the app, you can change price in the Tarif and availability section.

I would do it differently: create a Label instead of TextField use onTapGesture modifier to display a List view where you will have all the options return the selected item in List change the Label Of course, that will not let you edit the label, but I understand you don't need it. You could also use a Picker for the selection: https://stackoverflow.com/questions/60048058/swiftui-tap-gesture-recogniser-only-called-once-when-it-effects-a-state-change

Thanks for feedback. Great it works. And don't forget to close the thread. . But why the state object did not work? This should give you further explanations: h t t p s : / / jaredsinclair.com/2020/05/07/swiftui-cheat-sheet.html