I'm playing with @EnvironmentObject to see how it works in SwiftUI. I have the main view (ContentView) where it says the user has not logged in yet. By letting the user tap a link, I want to make it such that they can log in by tapping a button.
class LoginMe: ObservableObject {
@Published var loggedIn = false
}
struct ContentView: View {
@StateObject var loginMe = LoginMe()
var body: some View {
if loginMe.loggedIn {
Text("Yes, I'm logged in")
} else {
NavigationView {
VStack {
Text("No, not logged in yet")
.padding(.vertical)
NavigationLink(destination: LoginView()) {
Text("Tap to log in")
}
}
.navigationBarTitle("User")
}
.environmentObject(loginMe)
}
}
}
struct LoginView: View {
@EnvironmentObject var loginMe: LoginMe
var body: some View {
/*
Toggle(isOn: $loginMe.loggedIn) {
Text("Log in")
}.padding(.horizontal)
*/
Button("Login") {
loginMe.loggedIn.toggle()
}
}
}
So far, when the user taps a button in the LoginView view, the screen goes back to ContentView and the navigation simply disappears. How can I change my code so that the status will change back and forth in in the LoginView view by tapping a button and then so that they can return to ContentView the navigation return button? I think the problem is that I need to use @State var in ContentView and @Binding var in LoginView. Things are kind of confusing. Muchos thankos.
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import SwiftUI
struct ContentView: View {
@State var numbers = [2021, 9, 30]
var body: some View {
//let firstLocalYear = 2021
let firstLocalMonth = 9
let firstLocalDay = 24
let firstLastDay = 30
NavigationView {
List {
Section(header: Text("Current month")) {
ForEach(firstLocalDay ..< firstLastDay) { i in
HStack {
Text("\(firstLocalMonth)-\(i + 1)")
Spacer()
NavigationLink(
destination: TimeView(numbers: $numbers),
label: {
Text("")
})
}
}
}
}
}
}
}
struct TimeView: View {
@Binding var numbers: [Int]
var body: some View {
HStack {
Text(String(numbers[0]))
Text(String(numbers[1]))
Text(String(numbers[2]))
}
}
}
I have the lines of code above to list some rows of text. For now, numbers is a state variable that is pre-determined. This state variable is passed on to TimeView. Actually, I want to change this array depending on which row the user selects like
numbers = [firstLocalYear, firstLocalMonth, i]
where i comes from the ForEach thing. How can I change this array? Muchos thankos.
Hello,
I'm trying to work out a simple example to fill table view data with Combine. The following is what I have.
import Foundation
struct MyModel: Decodable {
let id: String
let type: String
}
import UIKit
import Combine
class APIClient: NSObject {
var cancellable: AnyCancellable?
let sharedSession = URLSession.shared
func fetchData(urlStr: String, completion: @escaping ([MyModel]?) -> Void) {
guard let url = URL(string: urlStr) else {
return
}
let publisher = sharedSession.dataTaskPublisher(for: url)
cancellable = publisher.sink(receiveCompletion: { (completion) in
switch completion {
case .failure(let error):
print(error)
case .finished:
print("Success")
}
}, receiveValue: { (result) in
let decoder = JSONDecoder()
do {
let post = try decoder.decode([MyModel].self, from: result.data)
completion(post)
} catch let error as NSError {
print("\(error)")
completion(nil)
}
})
}
}
import Foundation
class ViewModel: NSObject {
@IBOutlet var apiClient: APIClient!
var dataModels = [MyModel]()
func getGitData(completion: @escaping () -> Void) {
let urlStr = "https://api.github.com/repos/ReactiveX/RxSwift/events"
apiClient.fetchData(urlStr: urlStr) { (models) in
if let myModels = models {
self.dataModels = myModels.map { $0 }
}
completion()
}
}
}
import UIKit
import Combine
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
// MARK: - Variables
var cancellable: AnyCancellable?
@IBOutlet var viewModel: ViewModel!
@Published var models = [MyModel]()
// MARK: - IBOutlet
@IBOutlet weak var tableView: UITableView!
// MARK: - Life cycle
override func viewDidLoad() {
super.viewDidLoad()
viewModel.getGitData {
self.models = self.viewModel.dataModels
}
cancellable = $models.sink(receiveValue: { (result) in
DispatchQueue.main.async {
[weak self] in
guard let strongSelf = self else { return }
strongSelf.tableView.reloadData()
}
})
}
// MARK: - TableView
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return models.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell")
let dataModel = models[indexPath.row]
cell?.textLabel?.text = dataModel.id
cell?.detailTextLabel?.text = dataModel.type
return cell!
}
}
I'm not quite comfortable with the lines of code under my view controller (ViewController) in using Combine. How can I make them better? Muchos thankos.
I'm trying to animate a shape. The following is my code.
import SwiftUI
struct ContentView7: View {
@State private var goingLeft = true
@State private var goingUp = true
var body: some View {
ZStack {
Color.green.ignoresSafeArea()
CustomShape(quadDistance: goingUp ? 0: 60.0, horizontalDeviation: 0.0)
.fill(Color.red)
.ignoresSafeArea()
.animation(.easeInOut(duration: 1.0).repeatForever(), value: goingUp)
}.onAppear {
goingUp = false
}
}
}
struct CustomShape: Shape {
var quadDistance: CGFloat
var horizontalDeviation: CGFloat
func path(in rect: CGRect) -> Path {
Path { path in
path.move(to: CGPoint(x: -horizontalDeviation, y: 0))
path.addLine(to: CGPoint(x: rect.maxX + horizontalDeviation , y: 0))
path.addLine(to: CGPoint(x: rect.maxX + horizontalDeviation, y: rect.midY))
path.addLine(to: CGPoint(x: -horizontalDeviation, y: rect.midY))
path.move(to: CGPoint(x: -horizontalDeviation, y: rect.midY))
path.addQuadCurve(to: CGPoint(x: rect.maxX + horizontalDeviation, y: rect.midY), control: CGPoint(x: rect.midX, y: rect.midY + quadDistance))
}
}
}
Well, my intension is to move the center of the convex point up and down. But the shape won't animate itself. What am I doing wrong? Muchos thankos.
I'm trying to show a dialog over ContentView. The dialog view, ShowDialogView, has an ObservedObject object with name and properties.
class User: ObservableObject {
@Published var name = ""
@Published var age: Int = 0
}
struct ShowDialogView: View {
@Binding var isPresented: Bool
@ObservedObject var user: User
/*
@State var name = ""
*/
init(isPresented: Binding<Bool>, user: User) {
self._isPresented = isPresented
self.user = user.searchWord
//_name = State(initialValue: "Kimberly")
}
var body: some View {
VStack {
...
...
}.onAppear {
print("\(user.name)")
}
}
}
struct ContentView: View {
@State var user = User()
@State var showMe = true
var body: some View {
VStack {
...
...
ShowDialogView(isPresented: showMe, user: user)
}
}
}
The dialog view will open with no problem. The problem that I have is that the user object doesn't deliver anything beyond default values. If I somehow set the name property to "Kimberly" before the dialog appears, the app will end up showing no value (""). Even if I try setting an initial value to the name property in the constructor, the app will still show an empty value. What am I doing wrong? I'm sorry I cannot give you a lot of details in the code above. Thank you.
I have a @State variable with an array of strings with which to create instances of TextField. So far, I have the following lines of code.
import SwiftUI
struct ContentView: View {
@State private var names: [String] = ["Jim Thorton", "Susan Murphy", "Tom O'Donnell", "Nancy Smith"]
var body: some View {
HStack {
ForEach($names, id: \.self) { $name in
TextField("", text: $name)
.fixedSize()
.padding(.horizontal, 20.0)
.background(Color.orange.opacity(0.2))
}
}
}
}
I wonder if there is a simple way of aligning instances of TextField horizontally such that one that exceeds the screen width will go to the next line like the following picture?
Thanks.
I often use security-scoped bookmarks when I develop a desktop application in Cocoa. This time, I need to use them in an iOS app, using SwiftUI framework.
I don't quite remember the history, but I use UIDocumentPickerViewController through UIViewControllerRepresentable to let the user select a file. And I have a model where I save file name, file path, its bookmark (Data) with NSKeyedArchiver.. And everything goes well when I run the app in a simulator.
Yet, FileManager says each file in the model does not exist. One of the path is something like the following.
/private/var/mobile/Containers/Shared/AppGroup/749F05F0-12BC-40AC-B5C4-72571145C624/File Provider Storage/Test/somefile.txt
Since it doesn't exist, I cannot even resolve it. How can I resolve the bookmark if a file ends up at the File Provider Storage folder? Do I need a special capability that I don't know about or something? Thanks.
I have created a very simple sample project just to make my point using RealmSwift..
// ContentView.swift //
import SwiftUI
import RealmSwift
struct ContentView: View {
@StateObject var viewModel = ViewModel()
var body: some View {
NavigationView {
VStack {
Spacer()
NavigationLink("Listing all meals") {
ListView()
.environmentObject(viewModel)
}
Spacer()
}
}
}
}
// ListView.swift //
import SwiftUI
import RealmSwift
struct ListView: View {
@EnvironmentObject var viewModel: ViewModel
@State var meals = [MealDB]()
var body: some View {
List {
ForEach(meals) { meal in
HStack {
Text("\(meal.title)")
.padding(.leading, 6.0)
Spacer()
Button {
viewModel.model.delete(id: meal.id)
} label: {
Text("Delete")
}
.padding(.trailing, 6.0)
.buttonStyle(.borderless)
}
.onDrag {
return NSItemProvider()
}
}
.onMove(perform: move(from:to:))
}
.onAppear {
updateData()
}
}
func updateData() {
meals.removeAll()
// data from Realm database
for mealItem in viewModel.mealItems {// <<<<<<<<<<
meals.append(mealItem)
}
meals.sort {
(($0).place < (($1).place))
}
}
}
// ViewModel.swift //
import Foundation
import RealmSwift
class ViewModel: ObservableObject {
@Published var model = MealStore()
var mealItems: Results<MealDB> {
model.items
}
}
final class MealStore: ObservableObject {
var config: Realm.Configuration
init() {
config = Realm.Configuration()
}
var realm: Realm {
return try! Realm(configuration: config)
}
var items: Results<MealDB> {
realm.objects(MealDB.self)
}
}
// MealDB.swift //
import Foundation
import RealmSwift
class MealDB: Object, Identifiable {
@objc dynamic var id = ""
@objc dynamic var title = ""
@objc dynamic var order = 0
@objc dynamic var place = 0
override class func primaryKey() -> String? {
"id"
}
}
ListView has a list of meals. Each row comes with a button that lets me delete the corresponding row. And the app will crash inside the updateData function. I have found out that the issue is the way how SwiftUI works and hangs on to the old set of data even after I tap the delete button. So a solution is to 'freeze up' the dataset. And the app won't crash when I tap the delete button.
for mealItem in viewModel.mealItems.freeze() {
...
}
Now, my question is... Are there reasons for not freezing up the dataset? If there is no downside, how come MongoDB just doesn't tell us to do it when we use access a dataset in Realm? Thanks.
I didn't know that Settings Bundle exists till two days ago. Anyway, I've tested it with a simple example. As shown in the screenshot below, I have one group, one text field, one slider and two toggle buttons.
I am able to read the values from all of them except the slider. I wonder if it's a bug? I'm using Xcode 14.2. In the following code, the app won't go inside the if clause for the PSSliderSpecifier key.
import UIKit
class ViewController: UIViewController {
// MARK: - Life cyle
override func viewDidLoad() {
super.viewDidLoad()
let defaultValues = [String: AnyObject]()
UserDefaults.standard.register(defaults: defaultValues)
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
/* settings */
fetchSettingBundleData()
}
@objc func fetchSettingBundleData() {
let userDefaults = UserDefaults.standard
if let settingsURL = Bundle.main.url(forResource: "Root", withExtension: "plist", subdirectory: "Settings.bundle"), let settings = NSDictionary(contentsOf: settingsURL), let preferences = settings["PreferenceSpecifiers"] as? [NSDictionary] {
var defaultsToRegister = [String: Any]()
for preferenceSpecification in preferences {
if let key = preferenceSpecification["Type"] as? String, let value = preferenceSpecification["Title"] {
defaultsToRegister[key] = value
}
}
userDefaults.register(defaults: defaultsToRegister)
}
if let groupName = userDefaults.string(forKey: "PSGroupSpecifier") {
print("Group name: \(groupName)")
}
if let _ = userDefaults.string(forKey: "PSTextFieldSpecifier") {
if let text = userDefaults.string(forKey: "name_preference") {
print("Textfield \(text)")
}
}
if let _ = userDefaults.string(forKey: "PSToggleSwitchSpecifier") {
if let value = userDefaults.string(forKey: "enabled_preference1") {
print("Toggle \(value)") // 0 or 1
}
}
if let _ = userDefaults.string(forKey: "PSToggleSwitchSpecifier") {
if let value = userDefaults.string(forKey: "enabled_preference2") {
print("Toggle2 \(value)") // 0 or 1
}
}
if let _ = userDefaults.string(forKey: "PSSliderSpecifier") {
print("heck....") // No show
if let value = userDefaults.string(forKey: "slider_preference") {
print("Slider \(value)")
}
}
}
}
I am just playing with NSTextList by creating a sample iOS app. The following is my code.
import UIKit
class ViewController: UIViewController {
lazy var textView: UITextView = {
let textView = UITextView()
textView.text = ""
textView.contentInsetAdjustmentBehavior = .automatic
textView.backgroundColor = .white
textView.font = UIFont.systemFont(ofSize: 20.0)
textView.textColor = .black
textView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
textView.widthAnchor.constraint(equalToConstant: 600.0),
textView.heightAnchor.constraint(equalToConstant: 600.0)
])
return textView
}()
lazy var button: UIButton = {
let button = UIButton()
button.setTitle("End list", for: .normal)
button.setTitleColor(.white, for: .normal)
button.setTitleColor(.lightGray, for: .highlighted)
button.backgroundColor = .black
button.layer.cornerRadius = 8.0
button.addTarget(self, action: #selector(fixTapped), for: .touchUpInside)
button.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
button.widthAnchor.constraint(equalToConstant: 100.0),
button.heightAnchor.constraint(equalToConstant: 42.0)
])
return button
}()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .systemBlue
view.addSubview(textView)
view.addSubview(button)
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(dismissKeyboard))
view.addGestureRecognizer(tapGesture)
NSLayoutConstraint.activate([
textView.centerXAnchor.constraint(equalTo: view.centerXAnchor),
textView.centerYAnchor.constraint(equalTo: view.centerYAnchor)
])
NSLayoutConstraint.activate([
button.centerXAnchor.constraint(equalTo: view.centerXAnchor),
button.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -20.0)
])
let list = NSTextList(markerFormat: .diamond, options: 0)
list.startingItemNumber = 1
let paragraphStyle = NSParagraphStyle.default.mutableCopy() as! NSMutableParagraphStyle
paragraphStyle.textLists = [list]
let attributes = [NSAttributedString.Key.paragraphStyle: paragraphStyle, NSAttributedString.Key.font: UIFont.systemFont(ofSize: 24.0)]
let attributedStr = NSMutableAttributedString(string: "\n\n\n\n\n", attributes: attributes)
textView.textStorage.setAttributedString(attributedStr)
}
@objc func fixTapped() {
}
@objc func dismissKeyboard() {
view.endEditing(true)
}
}
When the app launches itself, I get 5 lines of diamond guys as shown in the following screenshot.
If I keep pressing the delete key with a connected keyboard, the list will be gone as shown below.
But if I press the RETURN key several times, the diamond list will come back as shown below.
So how can I end this June TextList madness? In code, I have the dismissKeyboard function if I can end this madness programmatically.
Thanks,
Señor Tomato Spaghetti
Chief Janitor at
Southeastern Tomato Spaghetti Trade Association
I've been trying to save a selected color with UserDefaults from UIColorPickerViewController. But I run into a color space fiasco. Anyway, here come my lines of code.
class ViewController: UIViewController, UIColorPickerViewControllerDelegate {
@IBOutlet weak var imageView: UIImageView!
@IBAction func selectTapped(_ sender: UIButton) {
let picker = UIColorPickerViewController()
picker.delegate = self
picker.selectedColor = .yellow
picker.supportsAlpha = false
present(picker, animated: true, completion: nil)
}
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
if let color = UserDefaultsUIColor.shared.readColor(key: "MyColor") {
print("Color being read: \(color)")
}
}
func colorPickerViewControllerDidFinish(_ viewController: UIColorPickerViewController) {
let color = viewController.selectedColor
print("Selected color: \(color)")
UserDefaultsUIColor.shared.saveColor(color: viewController.selectedColor, key: "MyColor")
}
func colorPickerViewControllerDidSelectColor(_ viewController: UIColorPickerViewController) {
imageView.backgroundColor = viewController.selectedColor
}
}
class UserDefaultsUIColor {
static let shared = UserDefaultsUIColor()
func saveColor(color: UIColor, key: String) {
let userDefaults = UserDefaults.standard
do {
let data = try NSKeyedArchiver.archivedData(withRootObject: color, requiringSecureCoding: false) as NSData?
userDefaults.set(data, forKey: key)
} catch {
print("Error UserDefaults: \(error.localizedDescription)")
}
}
func readColor(key: String) -> UIColor? {
let userDefaults = UserDefaults.standard
if let data = userDefaults.data(forKey: key) {
do {
if let color = try NSKeyedUnarchiver.unarchivedObject(ofClass: UIColor.self, from: data) {
return color
}
} catch {
print("Error UserDefaults")
}
}
return nil
}
}
I first start out with a yellow color (UIColor.yellow). And I select a color whose RGB values are 76, 212, 158, respectively. And the color picker guy returns the following.
kCGColorSpaceModelRGB 0.298039 0.831373 0.619608 1
And I get the following in reading the saved color data object.
UIExtendedSRGBColorSpace -0.270778 0.84506 0.603229 1
How can I save and read color data objects consistently? I could specify a color space when I save a color. But it doesn't go well.
Muchos thankos
Señor Tomato de Source
I have some lines of code below where I can make multiple selections.
import SwiftUI
struct ContentView: View {
@State private var selectedUsers: Set<String> = []
@State var users = ["Susan", "Kate", "Natalie", "Kimberly", "Taylor", "Sarah", "Nancy", "Katherine", "Nicole", "Linda", "Jane", "Mary", "Olivia", "Barbara"]
var body: some View {
VStack {
List(selection: $selectedUsers) {
ForEach(users, id: \.self) { user in
Text(user)
}
}
.environment(\.editMode, .constant(.active))
}
}
}
So the blue selection symbol appears as shown in the screenshot above. That's good. But that's not what I'm after. I just want to select one row at a time.
import SwiftUI
struct ContentView: View {
@State var selectedUser: String?
@State var users = ["Susan", "Kate", "Natalie", "Kimberly", "Taylor", "Sarah", "Nancy", "Katherine", "Nicole", "Linda", "Jane", "Mary", "Olivia", "Barbara"]
var body: some View {
VStack {
List(selection: $selectedUser) {
ForEach(users, id: \.self) { user in
Text(user)
}
}
.environment(\.editMode, .constant(.active))
}
}
}
In the lines of code above, I only let myself select one row at a time. And I don't get the blue selection symbol. I wonder why? I find two or three websites where they have similar lines of code and where they select one row at a time. And they have the blue selection symbol. Why don't I get it?
Mucho thankos for reading.
Oh, boy... Xcode has become more and more difficult to deal with. Today, I've dowloaded Version 15.0 beta 4. It took my 2019 iMac with 64 GB of RAM some 20 minutes just to launch an iPhone 14 Simulator and to let me see the home screen. Xcode takes 3 or 4 minutes to run code after I change just one line. I only have some 30 lines of code in total. It's a truly disappointing update. I wish they stop adding unnecessary features like code-folding animation to slow things down.
import UIKit
class ViewController: UIViewController {
private let photoView: UIImageView = {
let imageView = UIImageView()
imageView.image = UIImage(systemName: "airplane")
//imageView.clipsToBounds = true
imageView.contentMode = .scaleAspectFit
imageView.translatesAutoresizingMaskIntoConstraints = false
return imageView
}()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .systemYellow
view.addSubview(photoView)
NSLayoutConstraint.activate([
photoView.centerXAnchor.constraint(equalTo: view.centerXAnchor),
photoView.centerYAnchor.constraint(equalTo: view.centerYAnchor),
photoView.widthAnchor.constraint(equalToConstant: 200),
photoView.heightAnchor.constraint(equalToConstant: 200)
])
DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
self.runAirplaneAnimation()
}
}
func runAirplaneAnimation() {
photoView.addSymbolEffect(.pulse, animated: true)
}
}
I have the following lines of code to list some music titles from iTunes music. The code is 100% reproducible.
import SwiftUI
struct MusicView: View {
@StateObject var viewModel = ViewModel()
var body: some View {
MusicListView(viewModel: viewModel)
}
}
struct MusicListView: View {
@ObservedObject var viewModel: ViewModel
var body: some View {
NavigationView {
List(viewModel.results, id: \.self) { result in
VStack(alignment: .leading) {
Text("Track ID: \(result.trackId)")
Text("Track name: \(result.trackName)")
}
}
.task {
do {
try await viewModel.fetchMusic()
} catch SessionError.badURL {
print("Bad URL")
} catch SessionError.invalidHTTPResponse {
print("Invalid HTTP response")
} catch SessionError.error(let err) {
print("Error: \(err)")
} catch {
print("\(error.localizedDescription)")
}
}
.navigationTitle("Music")
}
}
}
class ViewModel: ObservableObject {
@Published var results: [Result] = []
func fetchMusic() async throws {
guard let url = URL(string: "https://itunes.apple.com/search?term=classical+music&entity=song") else {
throw SessionError.badURL
}
let urlRequest = URLRequest(url: url, timeoutInterval: 0.00) // <<<<<<<<<<<<<
URLSession.shared.dataTask(with: urlRequest) { data, response, error in
do {
guard let data = data, error == nil else {
throw SessionError.noData
}
guard let httpResponse = response as? HTTPURLResponse else {
throw SessionError.invalidHTTPResponse
}
switch httpResponse.statusCode {
case 200:
let res = try JSONDecoder().decode(Response.self, from: data)
DispatchQueue.main.async {
self.results = res.results
}
case 400...499:
throw SessionError.badURL
default:
fatalError()
break
}
} catch {
print(error.localizedDescription)
}
}
.resume()
}
}
struct Response: Codable {
let resultCount: Int
let results: [Result]
}
struct Result: Codable, Hashable {
var trackId: Int
var trackName: String
var collectionName: String
}
enum SessionError: Error {
case badURL
case noData
case decoding
case invalidHTTPResponse
case badRequest(statusCode: Int)
case redirection(statusCode: Int)
case server(statusCode: Int)
case error(String)
}
As you see in the screenshot, I get some music titles listed.
My question is why I get a list when in fact I have the URLRequest's timeout value set to 0.00? I haven't run it with an actual device. As far as I use an iPhone simulator, regardless of the timeout value that I set, I get data downloaded. I wonder why?
Muchos thankos for reading
I have followed a tutorial written by Hacking with Swift ( https://www.hackingwithswift.com/books/ios-swiftui/how-to-combine-core-data-and-swiftui) about Core Data in SwiftUI. The Entity name is Student. And it has two properties: name (String), id (UUID). And the following is my code.
import SwiftUI
struct CoreView: View {
@Environment(\.managedObjectContext) var managedObject
@FetchRequest(sortDescriptors: []) var students: FetchedResults<Student>
var body: some View {
VStack {
List(students) { student in
Text(student.name ?? "Unknown")
}
Button {
let firstNames = ["Gary", "Harry", "Elane", "Ray", "Nancy", "Jim", "Susan"]
let lastNames = ["Johns", "McNamara", "Potter", "Thompson", "Hampton"]
if let selectedFirstName = firstNames.randomElement(), let selectedLastName = lastNames.randomElement() {
let newStudent = Student(context: managedObject)
newStudent.id = UUID()
newStudent.name = "\(selectedFirstName) \(selectedLastName)"
try? managedObject.save()
}
} label: {
Text("Add")
}
}
}
}
struct CoreView_Previews: PreviewProvider {
static var previews: some View {
CoreView()
.environmentObject(DataController())
}
}
If I list all records and then add a new student to the list, the app will insert the last addition at a random row. I wonder if I can order these records by the creation date?
Muchos thankos