I noticed that when I enter the fully immersive view and then click the X button below the window, the immersive space remains active, and the only way to dismiss it is to click the digital crown. On other apps (Disney+ for example), closing out of the main window while in immersive mode also closes out the immersive space. I tried applying an onDisappear modifier to the the Modules view with a dismissImmersiveSpace, but that doesn't appear to do anything.
Any help would be appreciated.
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I’m trying to create a property wrapper that that can manage shared state across any context, which can get notified if changes happen from somewhere else.
I'm using mutex, and getting and setting values works great. However, I can't find a way to create an observer pattern that the property wrappers can use.
The problem is that I can’t trigger a notification from a different thread/context, and have that notification get called on the correct thread of the parent object that the property wrapper is used within.
I would like the property wrapper to work from anywhere: a SwiftUI view, an actor, or from a class that is created in the background. The notification preferably would get called synchronously if triggered from the same thread or actor, or otherwise asynchronously. I don’t have to worry about race conditions from the notification because the state only needs to reach eventuall consistency.
Here's the simplified pseudo code of what I'm trying to accomplish:
// A single source of truth storage container.
final class MemoryShared<Value>: Sendable {
let state = Mutex<Value>(0)
func withLock(_ action: (inout Value) -> Void) {
state.withLock(action)
notifyObservers()
}
func get() -> Value
func notifyObservers()
func addObserver()
}
// Some shared state used across the app
static let globalCount = MemoryShared<Int>(0)
// A property wrapper to access the shared state and receive changes
@propertyWrapper
struct SharedState<Value> {
public var wrappedValue: T {
get { state.get() }
nonmutating set { // Can't set directly }
}
var publisher: Publisher {}
init(state: MemoryShared) {
// ...
}
}
// I'd like to use it in multiple places:
@Observable
class MyObservable {
@SharedState(globalCount)
var count: Int
}
actor MyBackgroundActor {
@SharedState(globalCount)
var count: Int
}
@MainActor
struct MyView: View {
@SharedState(globalCount)
var count: Int
}
What I’ve Tried
All of the examples below are using the property wrapper within a @MainActor class. However the same issue happens no matter what context I use the wrapper in: The notification callback is never called on the context the property wrapper was created with.
I’ve tried using @isolated(any) to capture the context of the wrapper and save it to be called within the state in with unchecked sendable, which doesn’t work:
final class MemoryShared<Value: Sendable>: Sendable {
// Stores the callback for later.
public func subscribe(callback: @escaping @isolated(any) (Value) -> Void) -> Subscription
}
@propertyWrapper
struct SharedState<Value> {
init(state: MemoryShared<Value>) {
MainActor.assertIsolated() // Works!
state.subscribe {
MainActor.assertIsolated() // Fails
self.publisher.send()
}
}
}
I’ve tried capturing the isolation within a task with AsyncStream. This actually compiles with no sendable issues, but still fails:
@propertyWrapper
struct SharedState<Value> {
init(isolation: isolated (any Actor)? = #isolation, state: MemoryShared<Value>) {
let (taskStream, continuation) = AsyncStream<Value>.makeStream()
// The shared state sends new values to the continuation.
subscription = state.subscribe(continuation: continuation)
MainActor.assertIsolated() // Works!
let task = Task {
_ = isolation
for await value in taskStream {
_ = isolation
MainActor.assertIsolated() // Fails
}
}
}
}
I’ve tried using multiple combine subjects and publishers:
final class MemoryShared<Value: Sendable>: Sendable {
let subject: PassthroughSubject<T, Never> // ...
var publisher: Publisher {} // ...
}
@propertyWrapper
final class SharedState<Value> {
var localSubject: Subject
init(state: MemoryShared<Value>) {
MainActor.assertIsolated() // Works!
handle = localSubject.sink {
MainActor.assertIsolated() // Fails
}
stateHandle = state.publisher.subscribe(localSubject)
}
}
I’ve also tried:
Using NotificationCenter
Making the property wrapper a class
Using NSKeyValueObserving
Using a box class that is stored within the wrapper.
Using @_inheritActorContext.
All of these don’t work, because the event is never called from the thread the property wrapper resides in.
Is it possible at all to create an observation system that notifies the observer from the same context as where the observer was created?
Any help would be greatly appreciated!
No real intruduction for this, so I'll get to the point:
All this code is on GitHub: https://github.com/the-trumpeter/Timetaber-for-iWatch
But first, sorry;
/*
I got roasted,
last time I posted;
for not defining my stuff.
This'll be different,
but's gonna be rough;
'cuz there's lots and lots
to get through:
*/
//this is 'Timetaber Watch App/Define (No expressions)/Courses_vDef.swift' on the GitHub:
struct Course {
let name: String
let icon: String
let room: String
let colour: String
let listName: String
let listIcon: String
let joke: String
init(name: String, icon: String, room: String? = nil, colour: String,
listName: String? = nil, listIcon: String? = nil, joke: String? = nil)
{
self.name = name
self.icon = icon
self.room = room ?? "None"
self.colour = colour
self.listName = listName ?? name
self.listIcon = listIcon ?? (icon+".circle.fill")
self.joke = joke ?? ""
}
}
//this is 'Timetaber Watch App/TimeManager_fDef.swift' on the GitHub:
func getCurrentClass(date: Date) -> Array<Course> {
//returns the course in session depending on the input date
//it is VERY long but
//all you really need to know is what it returns:
//basically: return [rightNow, nextUp]
}
/*
I thought that poetry
would be okay,
But poorly thought things through:
For I'll probably find
that people online
will treat my rhymes like spew.
*/
So into the question:
I have a bunch of views, all (intendedly) watching two variables inside of a class:
//Github: 'Timetaber Watch App/TimetaberApp.swift'
class GlobalData: ObservableObject {
@Published var currentCourse: Course = getCurrentClass(date: .now)[0] // the current timetabled class in session.
@Published var nextCourse: Course = getCurrentClass(date: .now)[1] // the next timetabled class in session
}
...and a bunch of views using them in different ways as follows:
(Sorry, don't have the characters to define functions called in these)
import SwiftUI
//Github: 'Timetaber Watch App/Views/HomeView.swift'
struct HomeView: View {
@StateObject var data = GlobalData()
var body: some View {
//HERE:
let icon = data.currentCourse.icon
let name = data.currentCourse.name
let colour = data.currentCourse.colour
let room = roomOrBlank(course: data.currentCourse)
let next = data.nextCourse
VStack {
//CURRENT CLASS
Image(systemName: icon)
.foregroundColor(Color(colour))//add an SF symbol element
.imageScale(.large)
.font(.system(size: 25).weight(.semibold))
Text(name)
.font(.system(size:23).weight(.bold))
.foregroundColor(Color(colour))
.padding(.bottom, 0.1)
//ROOM
Text(room+"\n")
.multilineTextAlignment(.center)
.foregroundStyle(.gray)
.font(.system(size: 15))
if next.name != noSchool.name {
Spacer()
//NEXT CLASS
Text(nextPrefix(course: next))
.font(.system(size: 15))
Text(getNextString(course: next))
.font(.system(size: 15))
.multilineTextAlignment(.center)
}
}.padding()
}
}
// Github: 'Timetaber Watch App/Views/ListView.swift'
struct listTemplate: View {
@StateObject var data = GlobalData()
var listedCourse: Course = failCourse(feedback: "lT.12")
var courseTime: String = ""
init(course: Course, courseTime: String) {
self.courseTime = courseTime
self.listedCourse = course
}
var body: some View {
let localroom = if listedCourse.room == "None" {
"" } else { listedCourse.room }
let image = if listedCourse.listIcon == "custom1" {
Image(.paintbrushPointedCircleFill)
} else { Image(systemName: listedCourse.listIcon) }
HStack{
image
.foregroundColor(Color(listedCourse.colour))
.padding(.leading, 5)
Text(listedCourse.name)
.bold()
Spacer()
Text(courseTime)
Text(localroom).bold().padding(.trailing, 5)
}
.padding(.bottom, 1)
.background(data.currentCourse.name==listedCourse.name ? Color(listedCourse.colour).colorInvert(): nil) //HERE
}
}
struct listedDay: View {
let day: Dictionary<Int, Course>
var body: some View {
let dayKeys = Array(day.keys).sorted(by: <)
List {
ForEach((0...dayKeys.count-2), id: \.self) {
let num = $0
listTemplate(course: day[dayKeys[num]] ?? failCourse(feedback: "lD.53"), courseTime: time24toNormal(time24: dayKeys[num]))
}
}
}
}
struct ListView: View {
var body: some View {
if storage.shared.termRunningGB && weekdayFunc(inDate: .now) != 1
&& weekdayFunc(inDate: .now) != 7 {
ScrollView {
listedDay(
day: getTimetableDay(
isWeekA:
getIfWeekIsA_FromDateAndGhost(
originDate: .now,
ghostWeek: storage.shared.ghostWeekGB
),
weekDay: weekdayFunc(inDate: .now)
)
)
}
} else if !storage.shared.termRunningGB {
Text("There's no term running.\nThe day's classes will be displayed here.")
.multilineTextAlignment(.center)
.foregroundStyle(.gray)
.font(.system(size: 13))
} else {
Text("No school today.\nThe day's classes will be displayed here.")
.multilineTextAlignment(.center)
.foregroundStyle(.gray)
.font(.system(size: 13))
}
}
}
//There's one more view but I can't fit it for characters.
//On GitHub: 'Timetaber Watch App/Views/SettingsView.swift'
So...
THE FUNCTION:
This function is called when changes are made that will affect the correct output of getCurrentClass. It is intended to reload the views and the current/next variables to reflect those changes.\
//GHub: 'Timetaber Watch App/StorageManager.swift'
func reload() -> Void {
@ObservedObject var globalData: GlobalData //this line is erroring, I don't know how to fix it. Is this even the best/proper way to do this?
let courseData = getCurrentClass(date: .now)
globalData.currentCourse = courseData[0]
globalData.nextCourse = courseData[1]
//Variable '_globalData' used by function definition before being initialized
//that is the error appearing on those above two redefinitions.
print("Setup done\n")
}
Thanks!
-Gill
Hello,
I asked this question on 9th March but was asked to provide a project file and can't edit the original post. Please find the original question below and please find the new test project file at https://we.tl/t-fqAu8FrgUw.
I have a json array showing in Xcode debugger (from the line "print(dataString)"):
Optional("[{\"id\":\"8e8tcssu4u2hn7a71tkveahjhn8xghqcfkwf1bzvtrw5nu0b89w\",\"name\":\"Test name 0\",\"country\":\"Test country 0\",\"type\":\"Test type 0\",\"situation\":\"Test situation 0\",\"timestamp\":\"1546848000\"},{\"id\":\"z69718a1a5z2y5czkwrhr1u37h7h768v05qr3pf1h4r4yrt5a68\",\"name\":\"Test name 1\",\"country\":\"Test country 1\",\"type\":\"Test type 1\",\"situation\":\"Test situation 1\",\"timestamp\":\"1741351615\"},{\"id\":\"fh974sv586nhyysbhg5nak444968h7hgcgh6yw0usbvcz9b0h69\",\"name\":\"Test name 2\",\"country\":\"Test country 2\",\"type\":\"Test type 2\",\"situation\":\"Test situation 2\",\"timestamp\":\"1741351603\"},{\"id\":\"347272052385993\",\"name\":\"Test name 3\",\"country\":\"Test country 3\",\"type\":\"Test type 3\",\"situation\":\"Test situation 3\",\"timestamp\":\"1741351557\"}]")
But my JSON decoder is throwing the catch error "Error in JSON parsing"
This is the code:
let urlString = "https://www.notafunnyname.com/jsonmockup.php"
let url = URL(string: urlString)
guard url != nil else {
return
}
let session = URLSession.shared
let dataTask = session.dataTask(with: url!) { (data, response, error) in
var dataString = String(data: data!, encoding: String.Encoding.utf8)
print(dataString)
if error == nil && data != nil {
// Parse JSON
let decoder = JSONDecoder()
do {
let newsFeed = try decoder.decode(NewsFeed.self, from: data!)
print(newsFeed)
print(error)
}
catch{
print("Error in JSON parsing")
}
}
}
// Make the API Call
dataTask.resume()
}
And this is my Codable file NewsFeed.swift:
struct NewsFeed: Codable {
var id: String
var name: String
var country: String
var type: String
var overallrecsit: String
var dlastupd: String
var doverallrecsit: String
}
Please do you know why the parsing may be failing? Is it significant that in the debugging window the JSON is displaying backslashes before the quotation marks?
Thank you for any pointers :-)
Topic:
Programming Languages
SubTopic:
Swift
Undefined symbols for architecture arm64:
"_swift_coroFrameAlloc", referenced from:
NvMobileCore.Constraint.isActive.modify : Swift.Bool in NvMobileCore[5]
NvMobileCore.Constraint.isActive.modify : Swift.Bool in NvMobileCore[5]
NvMobileCore.NvMobileCoreManager.delegate.modify : NvMobileCore.NvPublicInterface? in NvMobileCore[53]
NvMobileCore.NvMobileCoreManager.delegate.modify : NvMobileCore.NvPublicInterface? in NvMobileCore[53]
NvMobileCore.NvMobileCoreManager.language.modify : Swift.String in NvMobileCore[53]
NvMobileCore.NvMobileCoreManager.language.modify : Swift.String in NvMobileCore[53]
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Xcode downloaded a crash report for my app that crashed when trying to insert a String into a Set<String>. Apparently there was an assertion failure ELEMENT_TYPE_OF_SET_VIOLATES_HASHABLE_REQUIREMENTS. I assume that this assertion failure happened because the hash of the new element didn't match the hash of an equal already inserted element, but regardless, I don't understand how inserting a simple string could trigger this assertion.
Here is essentially the code that leads to the crash. path is any file system directory, and basePath is a directory higher in the hierarchy, or path itself.
var scanErrorPaths = Set<String>()
func main() {
let path = "/path/to/directory"
let basePath = "/path"
let fileDescriptor = open(path, O_RDONLY)
if fileDescriptor < 0 {
if (try? URL(fileURLWithPath: path, isDirectory: false).checkResourceIsReachable()) == true {
scanErrorPaths.insert(path.relativePath(from: basePath)!)
return
}
}
extension String {
func relativePath(from basePath: String) -> String? {
if basePath == "" {
return self
}
guard let index = range(of: basePath, options: .anchored)?.upperBound else {
return nil
}
return if index == endIndex || basePath == "/" {
String(self[index...])
} else if let index = self[index...].range(of: "/", options: .anchored)?.upperBound {
String(self[index...])
} else {
nil
}
}
}
crash.crash
Hello I was wondering if there is a way to ensure that a C program I am writing can only write to 1 virtual page. I am trying to test how space efficient different Mallocs are and I need a way to ensure that the OS will not try to swap out pages making the space efficiency test pointless. I am on Mac OS Sonoma v14.5.
I have c++ macOs app(Xcode +14) and I try to add call to swift code.
I can't find any simple c++ xcodeproj call to swift code.
I create new simple project and fail to build it with error when I try to include #include <SwiftMixTester/SwiftMixTester-Swift.h>:
main.m:9:10: error: 'SwiftMixTester/SwiftMixTester-Swift.h' file not found (in target 'CppCallSwift' from project 'CppCallSwift')
note: Did not find header 'SwiftMixTester-Swift.h' in framework 'SwiftMixTester' (loaded from '/Users/yanivsmacm4/Library/Developer/Xcode/DerivedData/CppCallSwift-exdxjvwdcczqntbkksebulvfdolq/Build/Products/Debug') .
Please help.
Hello,
Please see the test project at https://we.tl/t-aWAu7kk9lD
I have a json array showing in Xcode debugger (from the line "print(dataString)"):
Optional("[{\"id\":\"8e8tcssu4u2hn7a71tkveahjhn8xghqcfkwf1bzvtrw5nu0b89w\",\"name\":\"Test name 0\",\"country\":\"Test country 0\",\"type\":\"Test type 0\",\"situation\":\"Test situation 0\",\"timestamp\":\"1546848000\"},{\"id\":\"z69718a1a5z2y5czkwrhr1u37h7h768v05qr3pf1h4r4yrt5a68\",\"name\":\"Test name 1\",\"country\":\"Test country 1\",\"type\":\"Test type 1\",\"situation\":\"Test situation 1\",\"timestamp\":\"1741351615\"},{\"id\":\"fh974sv586nhyysbhg5nak444968h7hgcgh6yw0usbvcz9b0h69\",\"name\":\"Test name 2\",\"country\":\"Test country 2\",\"type\":\"Test type 2\",\"situation\":\"Test situation 2\",\"timestamp\":\"1741351603\"},{\"id\":\"347272052385993\",\"name\":\"Test name 3\",\"country\":\"Test country 3\",\"type\":\"Test type 3\",\"situation\":\"Test situation 3\",\"timestamp\":\"1741351557\"}]")
But my JSON decoder is throwing a catch error
Line 57, Error in JSON parsing
typeMismatch(Swift.Dictionary<Swift.String, Any>, Swift.DecodingError.Context(codingPath: [], debugDescription: "Expected to decode Dictionary<String, Any> but found an array instead.", underlyingError: nil))
This is the code:
let urlString = "https://www.notafunnyname.com/jsonmockup.php"
let url = URL(string: urlString)
guard url != nil else {
return
}
let session = URLSession.shared
let dataTask = session.dataTask(with: url!) { (data, response, error) in
var dataString = String(data: data!, encoding: String.Encoding.utf8)
print(dataString)
if error == nil && data != nil {
// Parse JSON
let decoder = JSONDecoder()
do {
let newsFeed = try decoder.decode(NewsFeed.self, from: data!)
print("line 51")
print(newsFeed)
print(error)
}
catch{
print("Line 57, Error in JSON parsing")
print(error)
}
}
}
// Make the API Call
dataTask.resume()
}
And this is my Codable file NewsFeed.swift:
struct NewsFeed: Codable {
var id: String
var name: String
var country: String
var type: String
var situation: String
var timestamp: String
}
Please do you know how to resolve the typeMismatch error?
Topic:
Programming Languages
SubTopic:
Swift
I am creating a macOs SwiftUI document based app, and I am struggling with the Window sizes and placements. Right now by default, a normal window has the minimize and full screen options which makes the whole window into full screen mode.
However, I don't want to do this for my app. I want to only allow to fill the available width and height, i.e. exclude the status bar and doc when the user press the fill window mode, and also restrict to resize the window beyond a certain point ( which ideally to me is 1200 x 700 because I am developing on macbook air 13.3-inch in which it looks ideal, but resizing it below that makes the entire content inside messed up ).
I want something like this below instead of the default full screen green
When the user presses the button, it should position centered with perfect aspect ratio from my content ( or the one I want like 1200 x 700 ) and can be able to click again to fill the available width and height excluding the status bar and docs.
Here is my entire @main code :-
@main
struct PhiaApp: App {
@NSApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
var body: some Scene {
DocumentGroup(newDocument: PhiaProjectDocument()) { file in
ContentView(
document: file.$document,
rootURL: file.fileURL
)
.configureEditorWindow(disableCapture: true)
.background(AppColors.background)
.preferredColorScheme(.dark)
}
.windowStyle(.hiddenTitleBar)
.windowToolbarStyle(.unified)
.defaultLaunchBehavior(.suppressed)
Settings {
SettingsView()
}
}
}
struct WindowAccessor: NSViewRepresentable {
var callback: (NSWindow?) -> Void
func makeNSView(context: Context) -> NSView {
let view = NSView()
DispatchQueue.main.async { [weak view] in
callback(view?.window)
}
return view
}
func updateNSView(_ nsView: NSView, context: Context) { }
}
extension View {
func configureEditorWindow(disableCapture: Bool = true) -> some View {
self.background(
WindowAccessor { window in
guard let window else { return }
if let screen = window.screen ?? NSScreen.main {
let visible = screen.visibleFrame
window.setFrame(visible, display: true)
window.minSize = visible.size
}
window.isMovable = true
window.isMovableByWindowBackground = false
window.sharingType = disableCapture ? .captureBlocked : .captureAllowed
}
)
}
}
This is a basic setup I did for now, this automatically fills the available width and height on launch, but user can resize and can go beyond my desired min width and height which makes the entire content inside messy.
As I said, I want a native way of doing this, respect the content aspect ratio, don't allow to enter full screen mode, only be able to fill the available width and height excluding the status bar and doc, also don't allow to resize below my desired width and height.
When I run app, it works on iOS16+ device. But when I run on iOS15 device just working on debug mode, if I run release or profile modeI got runtime error:
Log:
(lldb) dyld[4928]: Symbol not found: (_objc_claimAutoreleasedReturnValue)
Referenced from: '/private/var/containers/Bundle/Application/C724D7C6-82FA-4AF3-AE83-EC035B4429A5/Runner.app/Frameworks/geolocator_apple.framework/geolocator_apple'
Expected in: '/usr/lib/libobjc.A.dylib'
thread #1, stop reason = signal SIGABRT
frame #0: 0x0000000106cbb2cc dyld`__abort_with_payload + 8
dyld`__abort_with_payload:
-&gt; 0x106cbb2cc &lt;+8&gt;: b.lo 0x106cbb2e8 ; &lt;+36&gt;
0x106cbb2d0 &lt;+12&gt;: stp x29, x30, [sp, #-0x10]!
0x106cbb2d4 &lt;+16&gt;: mov x29, sp
0x106cbb2d8 &lt;+20&gt;: bl 0x106c8164c ; cerror_nocancel
Target 0: (Runner) stopped.
Flutter doctor :
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.29.2, on macOS 15.2 24C101 darwin-arm64, locale en-VN)
[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 16.2)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2024.2)
[✓] VS Code (version 1.97.2)
Error: "Attrubute can only be applied to types not declarations" on line 2 : @unchecked
@unchecked
enum ReminderRow : Hashable, Sendable {
case date
case notes
case time
case title
var imageName : String? {
switch self {
case .date: return "calendar.circle"
case .notes: return "square.and.pencil"
case .time: return "clock"
default : return nil
}
}
var image : UIImage? {
guard let imageName else { return nil }
let configuration = UIImage.SymbolConfiguration(textStyle: .headline)
return UIImage(systemName: imageName, withConfiguration: configuration)
}
var textStyle : UIFont.TextStyle {
switch self {
case .title : return .headline
default : return .subheadline
}
}
}
Hello,
For the below code please can you tell me why the test code print("line 64") is being printed after the test code print("line 84") ? (i.e. how do I stop that happening?)
I would like the program to wait until the results array has been parsed before continuing the code (otherwise it does not have content to present).
I'm a bit confused why this is happening because I haven't written "async" anywhere.
import UIKit
struct NewsFeed: Codable {
var id: String
var name: String
var country: String
var type: String
var situation: String
var timestamp: String
}
class QuoteTableViewController: UITableViewController {
var newsFeed: [[String: String]] = []
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
// let selectedQuote = quotes[indexPath.row]
// performSegue(withIdentifier: "moveToQuoteDetail", sender: selectedQuote)
}
override func viewDidLoad() {
super.viewDidLoad()
// tableView.dataSource = self
}
// Uncomment the following line to preserve selection between presentations
// self.clearsSelectionOnViewWillAppear = false
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// (viewDidLoad loads after tableView)
// try getting array results here
let urlString = "https://www.notafunnyname.com/jsonmockup.php"
let url = URL(string: urlString)
let session = URLSession.shared
let dataTask = session.dataTask(with: url!) { (data, response, error) in
var dataString = String(data: data!, encoding: String.Encoding.utf8)
if error == nil && data != nil {
// Parse JSON
let decoder = JSONDecoder()
do {
var newsFeed = try decoder.decode([NewsFeed].self, from: data!)
print("line 64")
// print(newsFeed)
// print("line 125")
// print(newsFeed.count)
print(error)
}
catch{
print("Line 72, Error in JSON parsing")
print(error)
}
}
}
// Make the API Call
dataTask.resume()
// #warning Incomplete implementation, return the number of rows
print("line 84")
print(newsFeed.count)
return 10
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
// let cell = tableView.dequeueReusableCell(withIdentifier: "reuseIdentifier", for: indexPath)
let cell = UITableViewCell ()
cell.textLabel?.text = "test"
return cell
}
/*
// Override to support conditional editing of the table view.
override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
// Return false if you do not want the specified item to be editable.
return true
}
*/
/*
// Override to support editing the table view.
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
// Delete the row from the data source
tableView.deleteRows(at: [indexPath], with: .fade)
} else if editingStyle == .insert {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
*/
/*
// Override to support rearranging the table view.
override func tableView(_ tableView: UITableView, moveRowAt fromIndexPath: IndexPath, to: IndexPath) {
}
*/
/*
// Override to support conditional rearranging of the table view.
override func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
// Return false if you do not want the item to be re-orderable.
return true
}
*/
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destination.
// Pass the selected object to the new view controller.
// getPrice()
print("test_segue")
if let quoteViewController = segue.destination as? QuoteDetailViewController{
if let selectedQuote = sender as? String {
quoteViewController.title = selectedQuote
}
}
}
}
Many thanks
Topic:
Programming Languages
SubTopic:
Swift
I’m working on a project in Xcode 16.2 and encountered an issue where getAPI() with a default implementation in a protocol extension doesn’t show up in autocomplete. Here’s a simplified version of the code:
import Foundation
public protocol Repository {
func getAPI(from url: String?)
}
extension Repository {
public func getAPI(from url: String? = "https://...") {
getAPI(from: url)
}
}
final class _Repository: Repository {
func getAPI(from url: String?) {
// Task...
}
}
let repo: Repository = _Repository()
repo.getAPI( // Autocomplete doesn't suggest getAPI()
I’ve tried the following without success:
• Clean build folder
• Restart Xcode
• Reindexing
Is there something wrong with the code, or is this a known issue with Xcode 16.2? I’d appreciate any insights or suggestions.
I'm continuing with the migration towards Swift 6. Within one of our libraries, I want to check whether a parameter object: Any? confirms to Sendable.
I tried the most obvious one:
if let sendable = object as? Sendable {
}
But that results into the compiler error "Marker protocol 'Sendable' cannot be used in a conditional cast".
Is there an other way to do this?
I have a class that I want to custom encode into JSON:
class Declination: Decodable, Encodable {
var asString: String
var asDouble: Double
init(_ asString: String) {
self.asString = asString
self.asDouble = raToDouble(asString)
}
required init(from decoder: Decoder) throws {
let value = try decoder.singleValueContainer()
self.asString = try value.decode(String.self)
self.asDouble = declinationToDouble(asString)
}
}
As you can see, I calculate the double form of the declination when I decode a JSON file containing the data. What I want to do now is ENCODE the class back out as a single string.
Currently the standard JSON encode in Swift produces the following:
"declination":{"asDouble":18.26388888888889,"asString":"+18:15:50.00"}
what I want to produce is:
declination:"+18:15:50.00"
How can I easily do that? I've read up about custom encoders and such, and I get confused about the containers and what keys are being used. I think there might be a simple answer where I could just code:
extension Coordinate: Encodable {
func encode(to encoder: Encoder) throws {
return encoder.encode(self.asString)
}
}
But experienced Swift developers will immediately see that won't work. Should I do JSONSerialization instead? Can I just write a toString() extension and have JSON pick that up?
Any help would be appreciated.
Thanks,
Robert
Topic:
Programming Languages
SubTopic:
Swift
Hello,
I was expecting the code below to print the test message "line 25" because the class "API" is being called on line 57. But "line 25" is not being displayed in the debug window, please could you tell me why?
This is the debugging window:
line 93
0
line 93
0
line 93
0
import UIKit
// not sure these 2 below are needed
import SwiftUI
import Combine
struct NewsFeed: Codable {
var id: String
var name: String
var country: String
var type: String
var situation: String
var timestamp: String
}
let urlString = "https://www.notafunnyname.com/jsonmockup.php"
let url = URL(string: urlString)
let session = URLSession.shared
class API: ObservableObject {
let dataTask = session.dataTask(with: url!) { (data, response, error) in
print("line 25")
var dataString = String(data: data!, encoding: String.Encoding.utf8)
if error == nil && data != nil {
// Parse JSON
let decoder = JSONDecoder()
do {
var newsFeed = try decoder.decode([NewsFeed].self, from: data!)
print("line 38")
// print(newsFeed)
// print("line 125")
// print(newsFeed.count)
print(error)
}
catch{
print("Line 46, Error in JSON parsing")
print(error)
}
}
}.resume
// Make the API Call - not sure why but error clears if moved to line above
// dataTask.resume()
}
let myAPIarray = API()
class QuoteTableViewController: UITableViewController {
var newsFeed: [[String: String]] = []
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
// let selectedQuote = quotes[indexPath.row]
// performSegue(withIdentifier: "moveToQuoteDetail", sender: selectedQuote)
}
override func viewDidLoad() {
super.viewDidLoad()
// tableView.dataSource = self
}
// Uncomment the following line to preserve selection between presentations
// self.clearsSelectionOnViewWillAppear = false
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// (viewDidLoad loads after tableView)
// #warning Incomplete implementation, return the number of rows
print("line 93")
print(newsFeed.count)
return 10
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
// let cell = tableView.dequeueReusableCell(withIdentifier: "reuseIdentifier", for: indexPath)
let cell = UITableViewCell ()
cell.textLabel?.text = "test"
return cell
}
/*
// Override to support conditional editing of the table view.
override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
// Return false if you do not want the specified item to be editable.
return true
}
*/
/*
// Override to support editing the table view.
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
// Delete the row from the data source
tableView.deleteRows(at: [indexPath], with: .fade)
} else if editingStyle == .insert {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
*/
/*
// Override to support rearranging the table view.
override func tableView(_ tableView: UITableView, moveRowAt fromIndexPath: IndexPath, to: IndexPath) {
}
*/
/*
// Override to support conditional rearranging of the table view.
override func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
// Return false if you do not want the item to be re-orderable.
return true
}
*/
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destination.
// Pass the selected object to the new view controller.
// getPrice()
print("test_segue")
if let quoteViewController = segue.destination as? QuoteDetailViewController{
if let selectedQuote = sender as? String {
quoteViewController.title = selectedQuote
}
}
}
}
Topic:
Programming Languages
SubTopic:
Swift
I have a simple shell script as follows:
#!/bin/bash
OUTPUT="network.$(date +'%d-%m-%y').info.txt"
SUPPORT_ID="email"
echo "---------------------------------------------------" > $OUTPUT
echo "Run date and time: $(date)" >> $OUTPUT
echo "---------------------------------------------------" >> $OUTPUT
ifconfig >> $OUTPUT
echo "---------------------------------------------------" >> $OUTPUT
echo "Network info written to file: $OUTPUT."
echo "Please email this file to: $SUPPORT_ID."
It just dumps the network config into a file. At some point I will have the file emailed out, but right now I'm just trying to figure out why the output looks like the following?
bash ./test.sh
.etwork info written to file: network.26-01-25.info.txt
.lease email this file to: email
Why in the world does the initial character of the last couple of "echo" commands get clipped and turned into periods? The echos for the output of the commands piped into the output file are fine. Strange...
Any ideas?
Topic:
Programming Languages
SubTopic:
General
I’m working with Swift and encountered an issue when using the contains method on an array. The following code works fine:
let result = ["hello", "world"].contains(Optional("hello")) // ✅ Works fine
However, when I try to use the same contains method with the array declared in a separate constant(or variable), I get a compile-time error:
let stringArray = ["hello", "world"]
let result = stringArray.contains(Optional("hello")) // ❌ Compile-time error
The compiler produces the following error message:
Cannot convert value of type 'Optional<String>' to expected argument type 'String'
Both examples seem conceptually similar, but the second one causes a compile-time error, while the first one works fine.
This confuses me because I know that Swift automatically promotes a non-optional value to an optional when comparing it with an optional value. This means "hello" should be implicitly converted to Optional("hello") for the comparison.
What I understand so far:
The contains(_:) method is defined as:
func contains(_ element: Element) -> Bool
Internally, it calls contains(where:), as seen in the Swift source code:
🔗 Reference
contains(where:) takes a closure that applies the == operator for comparison.
Since Swift allows comparing String and String? directly (String is implicitly promoted to String? when compared with an optional), I expected contains(where:) to work the same way.
My Questions:
Why does the first example work, but the second one fails with a compile-time error?
What exactly causes this error in the second case, even though both cases involve comparing an optional value with a non-optional value?
Does contains(_:) behave differently when used with an explicit array variable rather than a direct array literal? If so, why?
I know that there are different ways to resolve this, like using nil coalescing or optional binding, but what I’m really looking for is a detailed explanation of why this issue occurs at the compile-time level.
Can anyone explain the underlying reason for this behavior?
I tried to build the project with Xcode 16.3 and I initially got an error that TARGET_IPHONE_SIMULATOR does not exist, then I changed this flag to TARGET_OS_SIMULATOR, but it did not solve the problem