Explore the various UI frameworks available for building app interfaces. Discuss the use cases for different frameworks, share best practices, and get help with specific framework-related questions.

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[NSRulerView] Is it buggy in Monterey?
I have a NSRulerView with a vertical orientation. It works fine from macOS 10.13 to 11.x. In macOS Monterey (12.2.1 here), the ruler view is not receiving drawHashMarksAndLabelsInRect: messages when the associated NSTextView is scrolled vertically. When the parent NSScrollView is resized, the ruler view is correctly refreshed on all macOS versions. [Q] Is it a known bug in macOS Monterey?
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863
Mar ’25
Crash on removal of QLPreviewController and _EXRemoteViewController
I have a controller that displays a pdf using UIDocumentInteractionController as the presented view. When users open it up, it shows fine. User gets the app backgrounded and session timed out. After timed out, when the app is brought to foreground, I bring our loginVC by removing the old VC used to show the UIDocumentInteractionController. All the crashes are happening at this point. I am not able to reproduce it, but our alert systems show we have crashes happening. The code that shows the pdf is straight forward documentViewController = UIDocumentInteractionController() documentViewController?.delegate = self documentViewController?.url = url documentViewController?.presentPreview(animated: true) and we reset it to nil in delegate documentInteractionControllerDidEndPreview Based on the crash trace, it seems like the crash happens when our login VC replaces it and only when pdf was displayed. The reason of stressing ONLY because when we have other viewcontroller present and they are removed in a similar way, we do not see any issue. So we always replace first and then add a new one childViewController.willMove(toParent: nil) childViewController.viewIfLoaded?.removeFromSuperview() childViewController.removeFromParent() addChild(childViewController) view.addSubview(childViewController.view) childViewController.view.frame = view.bounds childViewController.didMove(toParent: self) Raised a ticket with Apple, but I haven't heard back, and it's been a month. Posting here in case anyone experiences the same and has any solutions. I saw some related posts, and solution was to remove the pdf the moment the app goes to the background, but I am trying to find some alternate solution if possible.
Topic: UI Frameworks SubTopic: UIKit
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223
Mar ’25
iOS document based app problem running on Mac (Designed for iPad)
Please can somebody help me? I have a document-based iOS in the App Store (iNetWorth). I was able to run it on my M1 Mac Mini as a Mac (Designed for iPad) app without any issues until macOS 15. So, I created a simple test app based on a TabView to try and find out why I cannot get iNetWorth to run successfully on my Mac. The issue is that when TabViewApp.swift file looks like this: import SwiftUI @main struct TabViewApp: App { var body: some Scene { /*WindowGroup { ContentView() }*/ DocumentGroup(newDocument: TextFile()) { file in ContentView(document: file.$document) } } } TabView fails to load the ContentView() - in Xcode 16.2 running on macOS 15.3.2. On opening, the TabView app prompts the user to open a new or existing file normally but it then opens a window that is empty, apart from a Documents button and a label displaying the filename with a dropdown menu (Duplicate, Move, Rename..., Export As…). If the @Binding var document: TextFile line is removed from the ContentView() and the TabViewApp.swift file is changed to: import SwiftUI @main struct TabViewApp: App { var body: some Scene { WindowGroup { ContentView() } /*DocumentGroup(newDocument: TextFile()) { file in ContentView(document: file.$document) }*/ } } the TabView app loads and displays the ContentView() correctly. Both versions of TabView, when running in Xcode on My Mac (Designed for iPad), produce these warnings: CLIENT: Failure to determine if this machine is in the process of shutting down, err=1/Operation not permitted LSPrefs: could not find untranslocated node for <FSNode 0x6000013901a0> { isDir = ?, path = '/private/var/folders/3f/8788c4dj50q050_4wg9fssbr0000gp/X/518B55E1-0EC4-5D84-9202-4E44410EB249/d/Wrapper/TabView.app' }, proceeding on the assumption it is not translocated: Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted" LSPrefs: could not find untranslocated node for <FSNode 0x6000013901a0> { isDir = ?, path = '/private/var/folders/3f/8788c4dj50q050_4wg9fssbr0000gp/X/518B55E1-0EC4-5D84-9202-4E44410EB249/d/Wrapper/TabView.app' }, proceeding on the assumption it is not translocated: Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted" LSPrefs: could not find untranslocated node for <FSNode 0x6000013901a0> { isDir = ?, path = '/private/var/folders/3f/8788c4dj50q050_4wg9fssbr0000gp/X/518B55E1-0EC4-5D84-9202-4E44410EB249/d/Wrapper/TabView.app' }, proceeding on the assumption it is not translocated: Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted" LSPrefs: could not find untranslocated node for <FSNode 0x6000013901a0> { isDir = ?, path = '/private/var/folders/3f/8788c4dj50q050_4wg9fssbr0000gp/X/518B55E1-0EC4-5D84-9202-4E44410EB249/d/Wrapper/TabView.app' }, proceeding on the assumption it is not translocated: Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted” However, the document-based version of TabView also displays these warnings: cannot open file at line 49450 of [1b37c146ee] os_unix.c:49450: (2) open(/private/var/db/DetachedSignatures) - No such file or directory I suspect that the lack of the DetachedSignatures file is the root cause of the ContentView() not being loaded but I cannot find out how to generate a DetachedSignatures file. Adding an empty DetachedSignatures file or directory to /private/var/db/ does not help. Has anyone else experienced this problem (and maybe found a solution)? Should I raise it as a bug via Feedback or am I missing something obvious? Thanks!
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216
Mar ’25
business
import SwiftUI struct Product: Identifiable { let id = UUID() let name: String let pricePerKg: Double } struct ContentView: View { @State private var selectedProduct: Product? @State private var quantity: Double = 1.0 @State private var orderDate = Date() @State private var showingConfirmation = false let products = [ Product(name: "Lamb", pricePerKg: 15.0), Product(name: "Beef", pricePerKg: 20.0), Product(name: "Chicken", pricePerKg: 10.0) ] var body: some View { NavigationView { Form { Section(header: Text("Select Meat")) { Picker("Meat Type", selection: $selectedProduct) { ForEach(products) { product in Text(product.name).tag(product as Product?) } } } if let selectedProduct = selectedProduct { Section(header: Text("Quantity (kg)")) { Stepper(value: $quantity, in: 0.5...10, step: 0.5) { Text("\(quantity, specifier: "%.1f") kg") } } Section(header: Text("Delivery Date")) { DatePicker("Select Date", selection: $orderDate, in: Date()..., displayedComponents: .date) } Section(header: Text("Total Price")) { Text("$\(selectedProduct.pricePerKg * quantity, specifier: "%.2f")") } Button("Confirm Order") { showingConfirmation = true } .alert(isPresented: $showingConfirmation) { Alert(title: Text("Order Confirmed"), message: Text("You have ordered \(quantity, specifier: "%.1f") kg of \(selectedProduct.name) for \(orderDate.formatted(date: .long, time: .omitted))."), dismissButton: .default(Text("OK"))) } } } .navigationTitle("Halal Butcher") } } } @main struct HalalButcherApp: App { var body: some Scene { WindowGroup { ContentView() } } }
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218
Mar ’25
Can We Detect When Running Behind a Slide Over Window?
I'm trying to determine if it’s possible to detect when a user interacts with a Slide Over window while my app is running in the background on iPadOS. I've explored lifecycle methods such as scenePhase and various UIApplication notifications (e.g., willResignActiveNotification) to detect focus loss, but these approaches don't seem to capture the event reliably. Has anyone found an alternative solution or workaround for detecting this specific state change? Any insights or recommended practices would be greatly appreciated.
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123
Mar ’25
BUG: screen flicker on quick tap / swipe to go back
I have found a system bug with UINavigationController, UIGestureRecognizerDelegate mainly the swipe back control. I have reproduced this in many apps, while some that use custom swipe back i can not reproduce, however any app using default uikit/swift transitions i can reproduce the flicker/previous screen flashing The Bug: a slight tap or series of quick taps anywhere on the screen (with the slightest (1-2pt -x)confuse the system into thinking its a swipe back gesture, however instead of pushing back to previous screen the UI flickers and flashes the previous screen. for a split second, very easy to reproduce. on screens with lots of options of boxes to tap it happens quite often. I have removed all custom "swipe back from anywhere" logic, all custom gesture logic, and can still reproduce by tapping the edge of the screen with only UINavigationController, UIGestureRecognizerDelegate in my navigation controller. Please let me know the best way to get in contact with someone at apple to either build an extension to prevent this flicker or if a developer has a fix but this is rarely talked about. (velocity limits etc do not work, and just make the gesture feel awful) all the developers i have reached out too have looked into this and have said "its an ios bug, only fix is build a custom swipe back from anywhere, or wait for apple to fix it).... as a small indie app, building my own seems daunting Recap: quick or taps with small x movement flash previous screen instead of pushing back or simply recognizing it as a tap and not flashing previous screen. this happens with no custom code default uikit/swift. Link me your app i can probably reproduce it, I have reproduced it in X(was hard), Retro(easy), and many more. The goal is to have a smooth native swipe/drag back from anywhere gesture while preventing flicking on fast taps or short taps with minor x movement. i have tried everything from setting limits to -x, velocity limits etc. nothing fixes this. happy hacking! PS i hope someone at apple calls me and i can explain this and we can fix it for every app in an update.
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Mar ’25
Improving references to localized strings in App Intents
In order to make referencing keys for localized strings a little more reliable, our application references generated constants for localized string keys: This eliminates the potential for developers to misspell a key when referencing a localized strings. And because these constants are automatically generated by the exact same process that provides localized strings for the application, each and every constant is guaranteed to have a localized string associated with it. I’m currently attempting to implement something similar for the localized strings referenced by our new App Intents. Our initial release of App Intent functionality is simply using string literals to reference localized strings: However, I am running into several issues when trying to reference the string keys as a constant. The closest I managed to get was defining the constant as either a LocalizationValue or as a StaticString and referencing the constant while initializing the LocalizedStringResource. With this approach, I see no errors from Xcode until I try and compile. What’s more is that the wording of the error being thrown is quite peculiar: As you can see with the sample code above, I am clearly calling LocalizedStringResource’s initializer directly as Indicated by the error. Is what I’m trying to do even possible with App Intents? From my research, it does look like iOS app localization is moving more towards using string literals for localized strings. Like with String Catalog’s ability to automatically generate entries from strings referenced in UI without the need for a key. However, we’d prefer to use constants if possible for the reasons listed above.
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134
Apr ’25
Document-based app failing in Mac Catalyst
A document-based app that's been running fine on iPad and Mac Catalyst has stopped working on the Mac as of Sequoia 15.3. After the user selects a document to open, my app never gets called back from Apple's framework. (The app works fine on iPadOS.) Anybody else see this? I filed a feedback, FB16506048, several weeks ago but have had no reply.
Topic: UI Frameworks SubTopic: SwiftUI
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191
Mar ’25
Launch App with Siri on a locked device
We are looking at the possibility of launching our app through Siri with a locked device. We have the device responding to our App Intent but it is asking to be unlocked first. If the device is locked the intent works perfectly. It just doesn't seem to respect the set intentAuthenticationPolicy. Thank you for you time looking into this. We have set these var to .alwaysAllowed and open to true. static var authenticationPolicy: IntentAuthenticationPolicy = .alwaysAllowed static var openAppWhenRun: Bool = true Here is our full test code: import AppIntents import SwiftUI // MARK: - App Intents struct OpenAppIntent: AppIntent { static var title: LocalizedStringResource = "Open Main App" static var description: IntentDescription? = .init(stringLiteral: "Opens the App") static var authenticationPolicy: IntentAuthenticationPolicy = .alwaysAllowed static var openAppWhenRun: Bool = true func perform() async throws -> some IntentResult { print("App opened") return .result() } } struct TestAppShortcutProvider: AppShortcutsProvider { static var appShortcuts: [AppShortcut] { AppShortcut( intent: OpenAppIntent(), phrases: [ "Begin \(.applicationName)" ], shortTitle: "Open App", systemImageName: "popcorn.fill" ) } }
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117
Apr ’25
GPS Track Navigation with MapKit?
I want to create a MKRoute from a list of MKMapPoints or coordinates. But apparently MKRoute can only be generated from a MKDirections request from Apple's servers. The primary use of my app will be activities (eg hiking) in the back country where (1) a network connection likely won't be available and (2) there likely will not be a trail in Apple's map network. For example I want to provide navigation for following a recorded GPS track or my only MKPolyLines. Note that I am required to use MapKit (3rd party map SDKs are not an option for a number of reasons). It feels like a huge missed opportunity if MapKit doesn't allow Routes to be created from a predetermined list of coordinates. Does anyone know of any solutions for this problem either somehow creating a MKRoute from a list of coordinates or a 3rd party library? I've searched but haven't had any luck finding a solution. It seems like something like this must exist so I thought I'd ask.
Topic: UI Frameworks SubTopic: UIKit Tags:
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77
Apr ’25
SwiftUI FileDocument: Modify the default save dialog
Is it possible to change the default save dialog that appears when creating a document based MacOS app in SwiftUI? I have a basic FileDocument struct that gets called to a view using a DocumentGroup scene. struct MyFile: FileDocument { static let readableContentTypes: [UTType] = [.myFileType] static let writeableContentTypes: [UTType] = [.myFileType] var list: [String] init(configuration: ReadConfiguration) throws { let data = configuration.file.regularFileContents! let JSONDecoder = JSONDecoder() do { try list = JSONDecoder.decode([String].self, from: data) } catch { throw CocoaError(.fileReadCorruptFile) } } func fileWrapper(configuration: WriteConfiguration) throws -> FileWrapper { let JSONEncoder = JSONEncoder() JSONEncoder.outputFormatting = .prettyPrinted do { data = try JSONEncoder.encode(self.list) } catch { print(error.localizedDescription) throw CocoaError(.fileWriteUnknown) } return .init(regularFileWithContents: data) } } This gets called at the DocumentGroup DocumentGroup(newDocument: MyFile(), editor: { document in ContentView(document: document.$document) }) But when I save the file, I want the save dialog that appears to have something like a 'Tags' textField that can also store information about the file. Something similar to this: (https://i.sstatic.net/AJQ3YNb8.png) From what I can find, there isn't much information about this other than manually creating an NSSavePanel class and overriding the current save function
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480
Mar ’25
iOS18 iPad Custom UITabBar invalid
After my XCode was upgraded to 16.2, the custom bottom tabbar of iPadAPP could not be displayed properly (I set "traitOverrides.horizontalSizeClass = .compact", otherwise the tabbar would be displayed at the top and it was not the style I wanted) Below are my code and pictures of the running effects of iOS17 and iOS18 override func viewDidLoad() { super.viewDidLoad() setValue(CustomTabBar(), forKey: "tabBar") if #available(iOS 18.0, *) { self.mode = .tabBar self.traitOverrides.horizontalSizeClass = .compact } } } class CustomTabBar: UITabBar { var leftView = UIView() var rightView = UIView() override func sizeThatFits(_ size: CGSize) -> CGSize { var sizeThatFits = super.sizeThatFits(size) sizeThatFits.height = 60 // 自定义高度 return sizeThatFits } override func layoutSubviews() { super.layoutSubviews() self.backgroundColor = .red addSubview(leftView) addSubview(rightView) leftView.backgroundColor = .green leftView.frame = CGRect(x: 10, y: 4, width: 80, height: 40) rightView.backgroundColor = .green rightView.frame = CGRect(x: 600, y: 4, width: 80, height: 40) } } ![]("https://developer.apple.com/forums/content/attachment/66988297-26dc-4b40-af37-103f6a277563" "title=20250409151648.jpg;width=2394;height=1716")
Topic: UI Frameworks SubTopic: UIKit
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279
Apr ’25
How to make app for iPhone and iPad separatly
I released an app for iPhone (and it's could be downloaded for iPad also), and now I developered another app for iPad version with the same code and logic but I modified the layout to fit bigger screen and make better user experience and appearance. Howevert the app review rejected my release due to the duplicate content, how can I solve it?
Topic: UI Frameworks SubTopic: General
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47
Mar ’25
Replaykit stop screen record failed, recording status is false
I want to record screen ,and than when I call the method stopCaptureWithHandler:(nullable void (^)(NSError *_Nullable error))handler to stop recording and saving file. before call it,I check the value record of RPScreenRecorder sharedRecorder ,the value is false , It's weird! The screen is currently being recorded ! I wonder if the value of [RPScreenRecorder sharedRecorder].record will affect the method stopCaptureWithHandler: -(void)startCaptureScreen { [[RPScreenRecorder sharedRecorder] startCaptureWithHandler:^(CMSampleBufferRef _Nonnull sampleBuffer, RPSampleBufferType bufferType, NSError * _Nullable error) { //code } completionHandler:^(NSError * _Nullable error) { //code }]; } - (void)stopRecordingHandler { if([[RPScreenRecorder sharedRecorder] isRecording]){ // deal error .sometime isRecording is false }else { [[RPScreenRecorder sharedRecorder] stopCaptureWithHandler:^(NSError * _Nullable error) { }]; } } here are my code.
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105
Apr ’25
How to replace default user location annotation with custom avatar in SwiftUI Map with selection parameter?
I'm implementing a Map with user location customization in SwiftUI using iOS 17+ MapKit APIs. When using the selection parameter with Map, the default blue dot user location becomes tappable but shows an empty annotation view. However, using UserAnnotation makes the location marker non-interactive. My code structure: import SwiftUI import MapKit struct UserAnnotationSample: View { @State private var position: MapCameraPosition = .userLocation(fallback: .automatic) @State private var selectedItem: MapSelection<MKMapItem>? var body: some View { Map(position: $position, selection: $selectedItem) { // UserAnnotation() } .mapControls { MapUserLocationButton() } } } Key questions: How can I replace the empty annotation view with a custom avatar when tapping the user location? Is there a way to make UserAnnotation interactive with selection? Should I use tag modifier for custom annotations? What's the proper way to associate selections?
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330
Mar ’25
Uikit : -[UIApplication _terminateWithStatus:] + 136 (UIApplication.m:7539)
I have a few crash report from TestFlight with this context and nothing else. No symbols of my application. Crash report is attached. crashlog.crash It crashes at 16H25 (local time paris) and a few minutes after (8) I see the same user doing task in background (they download data with a particular URL in BGtasks) with a Delay that is consistant with a background wait of 5 or 7 minutes. I have no more information on this crash and by the way Xcode refuses to load it and shows an error. ( I did a report via Xcode for this).
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79
Mar ’25
List does not move the view into focused element, when changing it with a keyboard
Here is a simple main.swift file of a macOS app: import SwiftUI struct ContentView: View { @State private var selectedItem = 0 @FocusState private var isListFocused: Bool var body: some View { List(0..<40, id: \.self, selection: $selectedItem) { index in Text("\(index)") .padding() .focusable() } .focused($isListFocused) .onAppear { isListFocused = true } } } func createAppWindow() { let window = NSWindow( contentRect: .zero, styleMask: [.titled], backing: .buffered, defer: false ) window.contentViewController = NSHostingController(rootView: ContentView()) window.setContentSize(NSSize(width: 759, height: 300)) window.center() window.makeKeyAndOrderFront(nil) } class AppDelegate: NSObject, NSApplicationDelegate { func applicationDidFinishLaunching(_ notification: Notification) { createAppWindow() } } let delegate = AppDelegate() NSApplication.shared.delegate = delegate NSApplication.shared.run() Try to move the focus with a keyboard slowly as shown on the GIF attached and you'll see that the focus items don't sit in a List's view.
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320
Mar ’25
SwiftUI List DisclosureGroup Rendering Issues on macOS 13 & 14
Issue Description Whenever the first item in the List is a DisclosureGroup, all subsequent disclosure groups work fine. However, if the first item is not a disclosure group, the disclosure groups in subsequent items do not render correctly. This issue does not occur in macOS 15, where everything works as expected. Has anyone else encountered this behavior, or does anyone have a workaround for macOS 13 & 14? I’m not using OutlineGroup because I need to bind to an isExpanded property for each row in the list. Reproduction Steps I’ve created a small test project to illustrate the issue: Press “Insert item at top” to add a non-disclosure item at the start of the list. Then, press “Append item with sub-item” to add a disclosure group further down. The disclosure group does not display correctly. The label of the disclosure group renders fine, but the content of the disclosure group does not display at all. Press "Insert item at top with sub-item" and the list displays as expected. Build Environment macOS 15.3.2 (24D81) Xcode Version 16.2 (16C5032a) Issue Observed macOS 13 & 14 (bug occurs) macOS 15 (works correctly) Sample Code import SwiftUI class ListItem: ObservableObject, Hashable, Identifiable { var id = UUID() @Published var name: String @Published var subItems: [ListItem]? @Published var isExpanded: Bool = true init( name: String, subjobs: [ListItem]? = nil ) { self.name = name self.subItems = subjobs } static func == (lhs: ListItem, rhs: ListItem) -> Bool { lhs.id == rhs.id } func hash(into hasher: inout Hasher) { hasher.combine(id) } } struct ContentView: View { @State private var listItems: [ListItem] = [] @State private var selectedJob: ListItem? @State private var redraw: Int = 0 var body: some View { VStack { List(selection: $selectedJob) { ForEach(self.listItems, id: \.id) { job in self.itemRowView(for: job) } } .id(redraw) Button("Insert item at top") { self.listItems.insert( ListItem( name: "List item \(listItems.count)" ), at: 0 ) } Button("Insert item at top with sub-item") { self.listItems.insert( ListItem( name: "List item \(listItems.count)", subjobs: [ListItem(name: "Sub-item")] ), at: 0 ) } Button("Append item") { self.listItems.append( ListItem( name: "List item \(listItems.count)" ) ) } Button("Append item with sub-item") { self.listItems.append( ListItem( name: "List item \(listItems.count)", subjobs: [ListItem(name: "Sub-item")] ) ) } Button("Clear") { self.listItems.removeAll() } Button("Redraw") { self.redraw += 1 } } } @ViewBuilder private func itemRowView(for job: ListItem) -> some View { if job.subItems == nil { self.itemLabelView(for: job) } else { AnyView( erasing: ListItemDisclosureGroup(job: job) { self.itemLabelView(for: job) } jobRowView: { child in self.itemRowView(for: child) } ) } } @ViewBuilder private func itemLabelView(for job: ListItem) -> some View { Text(job.name) } struct ListItemDisclosureGroup<LabelView: View, RowView: View>: View { @ObservedObject var job: ListItem @ViewBuilder let labelView: () -> LabelView @ViewBuilder let jobRowView: (ListItem) -> RowView var body: some View { DisclosureGroup(isExpanded: $job.isExpanded) { if let children = job.subItems { ForEach(children, id: \.id) { child in self.jobRowView(child) } } } label: { self.labelView() } } } }
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76
Mar ’25