…start there, instead of at the welcome screen. You’ll also learn about how to store data in Swift dictionaries and realize that string manipulation is complicated. Data Persistence Depending on what type of data you’re saving, there are different ways of persisting your data: UserDefaults: Use this…

…simple download tasks in TheMet, you’ll use the built-in shared session, which provides a reasonable default behavior. Create a URL from a String like https://metmuseum.org. This could fail — for example, if the string is empty. Create a URLRequest from this URL: This object contains the HTTP method…

…five Text subviews, duplicate the Text(exerciseNames[index]) view, edit the second view to Text("Video player"), then duplicate this line and edit the strings to create this list: VStack { Text(exerciseNames[index]) Text("Video player") Text("Timer") Text("Start/Done button") Text("Rating") Text("History button") } Xcode Tip: Embed…

…there’s more to see. Note: When the label is only text, NavigationLink has a convenience initializer that creates a Text view from a String. ➤ In Live Preview, tap an item: Navigation link to ObjectView ContentView is currently the only view in the navigation stack. When you tap a list…

HistoryStore from ContentView to HIITFitApp to initialize it with or without saved history data. ThingStore has the property things, which is an array of String values. Like the HistoryStore in the first version of HIITFit, it’s a structure. In this chapter, you’ll first manage changes to the ThingStore…

…short, medium, long and full, described in links from the developer documentation page for DateFormatter.Style. You can also specify your own format as a String. ➤ Open DateExtension.swift. The first method shows how to use a DateFormatter. func formatted(as format: String) -> String { let dateFormatter = DateFormatter() dateFormatter.dateFormat = format return dateFormatter.string…

…flexible protocol that allows you to describe how to import and export any types. Some existing data types, such as Data, which is a string of bytes, already conform to Transferable. When you add photos, these will be of type UIImage, which unfortunately does not conform. You’ll overcome…

…decode data to and from external files. ➤ Open CardsApp.swift and add this code to the end of the file: struct Team: Codable { let names: [String] let count: Int } let teamData = Team( names: [ "Richard", "Libranner", "Caroline", "Audrey", "Ray" ], count: 5) After you’ve seen how Codable works, you’ll delete this…

Supply a button with an optional action. As well as the title you can provide a message that shows under the title. Surround the string with three """ to format your Text string on multiple lines. ➤ Build and run. Instead of seeing the failure message in the console…

…body: some Widget { TheMetWidget() } } ➤ Open TheMetWidget.swift, then find TheMetWidget and edit the last two modifiers: configurationDisplayName(_:) and description(_:). struct TheMetWidget: Widget { // 1 let kind: String = "TheMetWidget" var body: some WidgetConfiguration { StaticConfiguration( kind: kind, provider: Provider() // 2 ) { entry in if #available(iOS 17.0, *) { TheMetWidgetEntryView(entry: entry) // 3 .containerBackground(.fill.tertiary, for: .widget…

Object Notation) is the most common data format used for HTTP communication by app clients. It’s a structured data format consisting of numbers, strings, and arrays and dictionaries that can contain strings, numbers and nested arrays and dictionaries. Web forms use form-encoded, which looks like a query string…

HStack containing a button that will change the modal state. Because the text label for the button is a custom view, rather than a string, you use the Button(action:label:) initializer. You’ll add more toolbar items in a moment to this HStack. ➤ Fix the preview to send…

Documents URL. Tap the History button to see the sample data. Sample data In the console, you’ll see error messages: ForEach<Array, String, Text>: the ID Burpee occurs multiple times within the collection, this will give undefined results!. The error means that you are displaying non-unique…

…needed. This is called lazy loading. ➤ In StickerModal, create a new type method to load the sticker names: static func loadStickers() -> [String] { var themes: [URL] = [] var stickerNames: [String] = [] } You’ll first load the folder names in the top level in the Stickers folder. These will be themes…

…background. Light mode 2.circle and 2.circle.fill ➤ In HeaderView.swift, replace the contents of HeaderView with the following code: @Binding var selectedTab: Int // 1 let titleText: String var body: some View { VStack { Text(titleText) .font(.largeTitle) HStack { // 2 ForEach(Exercise.exercises.indices, id: \.self) { index in // 3 let fill = index == selectedTab ? ".fill" : "" Image(systemName…

Welcome!: The text changes in the canvas, too. Editing the view in the code also changes the canvas. A Text view simply displays a string of characters. It’s useful for listing the views you plan to create, as a kind of outline. You’ll use multiple Text views…

…default “Hello World” from SplashScreen. Hello, World ➤ Open SplashScreen.swift and add this new method to SplashScreen: func card(letter: String, color: String) -> some View { ZStack { RoundedRectangle(cornerRadius: 25) .shadow(radius: 3) .frame(width: 120, height: 160) .foregroundStyle(.white) Text(letter) .fontWeight(.bold) .scalableText() .foregroundStyle(Color(color)) .frame(width…

…modifiers display a globe symbol. You’ll learn about the Image view in Chapter 3, “Prototyping the Main View”. Text("Hello, world!") displays the string “Hello, world!”. ➤ Click the Selectable button below the preview canvas, then click the Text view in the canvas and select the Quick Help inspector. Text…

…your card element data in this way: class CardElement { var transform: Transform } class ImageElement: CardElement { var image: Image? } class TextElement: CardElement { var text: String? } Here you have a base class CardElement with two sub-classes inheriting from CardElement. ImageElement and TextElement both inherit the transform property, but each type…

…particular, when ExerciseView adds an ExerciseDay to exerciseDays, HistoryView gets updated. ➤ Now, add the following method to HistoryStore, below init(): func addDoneExercise(_ exerciseName: String) { let today = Date() if today.isSameDay(as: exerciseDays[0].date) { // 1 print("Adding \(exerciseName)") exerciseDays[0].exercises.append(exerciseName) } else { exerciseDays.insert( // 2 ExerciseDay(date: today, exercises: [exerciseName…