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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List rows partially obscured by navigation bar briefly render fully opaque when switching tabs (iOS 26)
Overview In iOS 26, a List embedded in a NavigationStack inside a TabView exhibits a visual glitch when switching tabs. When the list is scrolled such that some rows are partially obscured by the navigation bar, the system correctly applies a fade/opacity effect to those rows. However, if the user switches to another tab while rows are in this partially obscured (faded) state, those rows briefly flash at full opacity during the tab transition before disappearing. This flash is visually distracting and appears to be inconsistent with the intended scroll-edge opacity behavior. The issue occurs only for rows partially obscured by the navigation bar. Rows partially obscured by the tab bar do not exhibit this flashing behavior. Steps to Reproduce: Run the attached minimal reproduction on iOS 26. Open the first tab. Scroll the list so that some rows are partially hidden behind the navigation bar (showing the native faded appearance). While rows are in this partially faded state, switch to the second tab. Observe that the faded rows briefly render fully opaque during the tab switch. Expected Behavior: Rows that are partially obscured by the navigation bar should maintain consistent opacity behavior during tab transitions, without flashing to full opacity. import SwiftUI @main struct NavBarReproApp: App { /// Minimal repro for iOS 26: /// - TabView with two tabs /// - First tab: NavigationStack + List /// - Scroll so some rows are partially behind the nav bar (faded) /// - Switch tabs: those partially-faded rows briefly flash fully opaque. Partially faded rows under the tab bar do not flash private let items = Array(0..<200).map { "Row \($0)" } var body: some Scene { WindowGroup { TabView { NavigationStack { List { ForEach(items, id: \.self) { item in Text(item) } } .navigationTitle("One") .navigationBarTitleDisplayMode(.inline) } .tabItem { Label("One", systemImage: "1.circle") } NavigationStack { Text("Second tab") .navigationTitle("Two") .navigationBarTitleDisplayMode(.inline) } .tabItem { Label("Two", systemImage: "2.circle") } } } } }
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183
Jan ’26
NavigationSplitView not fully supported on smaller (SE) iPhones
My SwiftUI code runs fine on macOS, iOS(iPad) and larger iPhones, but will not display the detail view on smaller iPhones. Is there a way to force the smaller iPhones to display the detail view? And if not, When I put the App on the Apple store, for sale, will the Apple store be smart enough to flag the App as not appropriate for smaller iPhones, such as the SE (2nd and 3rd gen.) and prevent downloads? Thanks in advance for any guidance.
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1.2k
Jul ’25
Screenshot preventing
I’d like to know if Apple currently supports any public API or entitlement for blocking in-app screenshots on iOS. If no such API exists, what is the officially recommended approach for App Store apps to prevent or react to screenshots of sensitive content in a banking app? I have tried using a hidden UITextField with isSecureTextEntry = true and observing UIApplication.userDidTakeScreenshotNotification, but these methods do not block the initial screenshot. Could you please advise how to block screenshots in my app?
Topic: UI Frameworks SubTopic: UIKit
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172
Jun ’25
SwiftUI @State Updates Not Reflecting in UI Until View Reconstruction (Xcode Preview & Device)
Issue Description I'm experiencing a bizarre SwiftUI state update issue that only occurs in Xcode development environment (both Canvas preview and device debugging), but does not occur in production builds downloaded from App Store. Symptom: User taps a button that modifies a @State variable inside a .sheet Console logs confirm the state HAS changed But the UI does not update to reflect the new state Switching to another file in Xcode and back to ContentView instantly fixes the issue The production build (same code) works perfectly fine Environment Xcode: 16F6 (17C52) iOS: 26.2 (testing on iPhone 13) macOS: 25.1.0 (Sequoia) SwiftUI Target: iOS 15.6+ Issue: Present in both Xcode Canvas and on-device debugging Production: Same code works correctly in App Store build (version 1.3.2) Code Structure Parent View (ContentView.swift) struct ContentView: View { @State private var selectedSound: SoundTheme = .none @State private var showSoundSheet = false var body: some View { VStack { // Display button shows current selection SettingButton( title: "Background Sound", value: getLocalizedSoundName(selectedSound) // ← Not updating ) { showSoundSheet = true } } .sheet(isPresented: $showSoundSheet) { soundSelectionView } } private var soundSelectionView: some View { ForEach(SoundTheme.allCases) { sound in Button { selectedSound = sound // ← State DOES change (confirmed in console) // Audio starts playing correctly audioManager.startAmbientSound(sound) } label: { Text(sound.name) } } } private func getLocalizedSoundName(_ sound: SoundTheme) -> String { // Returns localized name return sound.localizedName }} What I've Tried Attempt 1: Adding .id() modifier SettingButton(...) .id(selectedSound) // Force re-render when state changes Result: No effect Attempt 2: Moving state modification outside withAnimation // Before (had animation wrapper):withAnimation { selectedSound = sound}// After (removed animation):selectedSound = sound Result: No effect Attempt 3: Adding debug print() statements selectedSound = soundprint("State changed: (selectedSound)") // ← Adding this line FIXES the issue! Result: Mysteriously fixes the issue! But removing print() breaks it again. This suggests a timing/synchronization issue in Xcode's preview system. Observations What works: ✅ Console logs confirm state changes correctly ✅ Switching files in Xcode triggers view reconstruction → everything works ✅ Production build from App Store works perfectly ✅ Adding print() statements "fixes" it (likely changes execution timing) What doesn't work: ❌ Initial file load in Xcode ❌ Hot reload / incremental updates ❌ Both Canvas preview and on-device debugging Workaround that works: Click another file in Xcode Click back to ContentView.swift Everything works normally Key Question Is this a known issue with Xcode 16's SwiftUI preview/hot reload system? The fact that: Same exact code works in production Adding print() "fixes" it File switching triggers reconstruction that fixes it ...all suggest this is an Xcode tooling issue, not a code bug. However, it makes development extremely difficult as I can't reliably test changes without constantly switching files or killing the app. What I'm Looking For Confirmation: Is this a known Xcode 16 issue? Workaround: Any better solution than constantly switching files? Root cause: What's causing this state update timing issue? Any insights would be greatly appreciated!
Topic: UI Frameworks SubTopic: SwiftUI
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356
Dec ’25
touchesEnded: not triggered on newer iOS when view is inside UIScrollView (was working on iOS 18)
Hi everyone, I’m facing an issue with touch handling on newer iOS versions. I have a custom view controller implemented in Objective-C that overrides touchesEnded:. The same code works correctly on iOS 18, but on newer iOS versions (tested on iOS 26), touchesEnded: is no longer being triggered. Important observations: touchesBegan: is triggered. touchesEnded: is NOT triggered. touchesCancelled: is also NOT triggered. No code changes were made between iOS 18 and iOS 26. Same code, same sample works fine in iOS18 device but not in iOS26 device Questions: Has gesture arbitration behavior changed in recent iOS 26 versions when views are inside UIScrollView? Any clarification on whether this is intended behavior or a regression would be greatly appreciated. Thank you.
Topic: UI Frameworks SubTopic: UIKit
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2w
On iPadOS 26 beta, the navigation bar can appear inset underneath the status bar (FB18241928)
On iPadOS 26 beta, the navigation bar can appear inset underneath the status bar (FB18241928) This bug does not happen on iOS 18. This bug occurs when a full screen modal view controller without a status bar is presented, the device orientation changes, and then the full screen modal view controller is dismissed. This bug appears to happen only on iPad, and not on iPhone. This bug happens both in the simulator and on the device. Thank you for investigating this issue.
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531
Aug ’25
Change tint of back button in UINavigationItem on iOS 26
I am struggling to change the tint of the back button in an UINavigationItem. In iOS 18.6 it looks like this while on iOS 26 the same looks like this I can live without the Dictionary but I'd like to get the blue color back. In viewDidLoad() I have tried navigationItem.backBarButtonItem?.tintColor = .link but this did not work since navigationItem.backBarButtonItem is nil. My second attempt was navigationController?.navigationBar.tintColor = .link but this didn't work either. I have even set the Global Tint to Link Color but this had no effect either. Does anyone have an idea how to change the tint of the back button in an UINavigationItem on iOS 26?
Topic: UI Frameworks SubTopic: UIKit Tags:
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460
Jan ’26
Liquid Glass TabBar animations causes Hangs, bug with UIKitCore?
With iOS 26.1 we started seeing a bug that only appears on iPhone Air. This bug is visible with simulators too. I have tried so many different ways to fix the issue, but Instruments Profiler is pointing at UIKitCore. We load a tab bar, when the user attempts to switch a tab, the app hangs and never recovers. It happens right as the animation of the Glass bubble is in progress. I have tried a UIKit Tab bar, a SwiftUI Tab bar. I tore out AppDelegate and did a direct @main SwiftUI entry for my application. This issue appears with every tab bar instance I try. I attempted to disable LiquidGlass by utilizing this flag UIDesignRequiresCompatibility in my plist, but the flag seems to be ignored by the system. I am not sure what else to try. I have a trace file if that is helpful. What else can I upload? Here is what the code looks like. struct ContentView: View { @State private var selectedTab = 2 var body: some View { TabView(selection: $selectedTab) { Text("Profile") .tabItem { Label("Me", systemImage: "person") } .tag(0) Text("Training") .tabItem { Label("Training", systemImage: "calendar") } .tag(1) Text("Home") .tabItem { Label("Home", systemImage: "house") } .tag(2) Text("Goals") .tabItem { Label("Goals", systemImage: "target") } .tag(3) Text("Coach") .tabItem { Label("Coach", systemImage: "person.2") } .tag(4) } } } #Preview { ContentView() } and AppView entry point import SwiftUI @main struct RunCoachApp: App { var body: some Scene { WindowGroup { ContentView() } } }
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502
Dec ’25
Wrong appearance of decimalPad keyboard in dark mode
Hi. The following code causes UI mismatch on iOS26. Keyboard with type decimalPad and appearance as dark is displayed as popUp with wrong colors. Before iOS26 keyboard was regular with correct color scheme. Please advice either how to make the scheme correct or force to display regular keyboard instead of popup. class ViewController: UIViewController { @IBOutlet weak var textField: UITextField! override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view. textField.keyboardType = .decimalPad textField.keyboardAppearance = .dark view.backgroundColor = .darkGray } }
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1w
Detecting marked range in UI/NSTextViews at the time of shouldChangeTextIn
We have submitted a feedback for this issue: FB21230723 We're building a note-taking app for iOS and macOS that uses both UITextView and NSTextView. When performing text input that involves a marked range (such as Japanese input) in a UITextView or NSTextView with a UITextViewDelegate or NSTextViewDelegate set, the text view's marked range (markedTextRange / markedRange()) has not yet been updated at the moment when shouldChangeTextIn is invoked. UITextViewDelegate.textView(_:shouldChangeTextIn:replacementText:) NSTextViewDelegate.textView(_:shouldChangeTextIn:replacementString:) The current behavior is this when entering text in Japanese: (same for NSTextView) func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool { print(textView.markedTextRange != nil) // prints out false DispatchQueue.main.async { print(textView.markedTextRange != nil) // prints out true } } However, we need the value of markedTextRange right away in order to determine whether to return true or false from this method. Is there any workaround for this issue?
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516
Jan ’26
.contactAccessPicker shows blank sheet on iOS 26.2.1 on device
Calling contactAccessPicker results in a blank sheet and a jetsam error, rather than the expected contact picker, using Apple’s sample code, only on device with iOS 26.2.1. This is happening on a iPhone 17 Pro Max running 26.2.1, and not on a simulator. I’m running Apple's sample project Accessing a person’s contact data using Contacts and ContactsUI Steps: Run the sample app on device running iOS 26.2.1. Use the flow to authorize .limited access with 1 contact: Tap request access, Continue, Select Contacts. Select a contact, Continue, Allow Selected Contact. This all works as expected. Tap the add contact button in the toolbar to add a second contact. Expected: This should show the Contact Access Picker UI. Actual: Sheet is shown with no contents. See screenshot of actual results on iOS device running 26.2.1. Reported as FB21812568 I see a similar (same?) error reported for 26.1. It seems strange that the feature is completely broken for multiple point releases. Is anyone else seeing this or are the two of us running into the same rare edge case? Expected Outcome, seen on simulator running 26.2 Actual outcome, seen on device running 26.2.1
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NSTextLineFragment crash - how to debug
We have crash reports as shown below that we haven't yet been able to repro and could use some help deubgging. My guess is that the app is giving a label or text view an attributed string with an invalid attribute range, but attributed strings are used in many places throughout the app, and I don't know an efficient way to track this down. I'm posting the stack trace here in hopes that someone more familiar with the internals of the system frameworks mentioned will be able to provide a clue to help narrow where I should look. Fatal Exception: NSRangeException NSMutableRLEArray objectAtIndex:effectiveRange:: Out of bounds 0 CoreFoundation 0x2d5fc __exceptionPreprocess 1 libobjc.A.dylib 0x31244 objc_exception_throw 2 Foundation 0x47130 blockForLocation 3 UIFoundation 0x2589c -[NSTextLineFragment _defaultRenderingAttributesAtCharacterIndex:effectiveRange:] 4 UIFoundation 0x25778 __53-[NSTextLineFragment initWithAttributedString:range:]_block_invoke 5 CoreText 0x58964 TLine::DrawGlyphsWithAttributeOverrides(TLineDrawContext const&, __CFDictionary const* (long, CFRange*) block_pointer, TDecoratorObserver*) const 6 CoreText 0x58400 CTLineDrawWithAttributeOverrides 7 UIFoundation 0x25320 _NSCoreTypesetterRenderLine 8 UIFoundation 0x24b10 -[NSTextLineFragment drawAtPoint:graphicsContext:] 9 UIFoundation 0x3e634 -[NSTextLineFragment drawAtPoint:inContext:] 10 UIFoundation 0x3e450 -[NSTextLayoutFragment drawAtPoint:inContext:] 11 UIKitCore 0x3e3098 __38-[_UITextLayoutFragmentView drawRect:]_block_invoke 12 UIKitCore 0x3e31cc _UITextCanvasDrawWithFadedEdgesInContext 13 UIKitCore 0x3e3040 -[_UITextLayoutFragmentView drawRect:] 14 UIKitCore 0xd7a98 -[UIView(CALayerDelegate) drawLayer:inContext:] 15 QuartzCore 0x109340 CABackingStoreUpdate_ 16 QuartzCore 0x109224 invocation function for block in CA::Layer::display_() 17 QuartzCore 0x917f0 -[CALayer _display] 18 QuartzCore 0x90130 CA::Layer::layout_and_display_if_needed(CA::Transaction*) 19 QuartzCore 0xe50c4 CA::Context::commit_transaction(CA::Transaction*, double, double*) 20 QuartzCore 0x5bd8c CA::Transaction::commit() 21 UIKitCore 0x9f3f0 _UIApplicationFlushCATransaction 22 UIKitCore 0x9c89c __setupUpdateSequence_block_invoke_2 23 UIKitCore 0x9c710 _UIUpdateSequenceRun 24 UIKitCore 0x9f040 schedulerStepScheduledMainSection 25 UIKitCore 0x9cc5c runloopSourceCallback 26 CoreFoundation 0x73f4c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ 27 CoreFoundation 0x73ee0 __CFRunLoopDoSource0 28 CoreFoundation 0x76b40 __CFRunLoopDoSources0 29 CoreFoundation 0x75d3c __CFRunLoopRun 30 CoreFoundation 0xc8284 CFRunLoopRunSpecific 31 GraphicsServices 0x14c0 GSEventRunModal 32 UIKitCore 0x3ee674 -[UIApplication _run] 33 UIKitCore 0x14e88 UIApplicationMain also filed as FB16905066
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522
Jan ’26
UIAlertController sometimes does not call its UIAlertAction handler
The iOS app that I’m helping to develop displays the following behavior, observed on an iPad Pro (4th generation) running iOS 18.1.1: The app uses UIAlertController to show an action sheet with two buttons (defined by two UIAlertAction objects). Each button has a handler block, and the first thing each handler does is to log that it was called. When the user taps one of the buttons and the action sheet disappears, most of the time the appropriate UIAlertAction handler is called. But sometimes there is no log entry for either of the action handlers, nor does the app do anything else associated with the chosen button, in which case I conclude that the handler was not called. I want to emphasize that I’m describing instances of the same action sheet displayed by the same code. Most of the time the appropriate button handler is called, but sometimes the handler is not called. The uncalled handler problem occurs about once per hour during normal use of the app. The problem has continued to occur across many weeks of testing. What could cause UIAlertController not to call its action handler?
Topic: UI Frameworks SubTopic: UIKit Tags:
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151
Apr ’25
tabViewBottomAccessory in 26.1: View's @State is lost when switching tabs
Any view that is content for the tabViewBottomAccessory API fails to retain its state as of the last couple of 26.1 betas (and RC). The loss of state happens (at least) when the currently selected tab is switched (filed as FB20901325). Here's code to reproduce the issue: struct ContentView: View { @State private var selectedTab = TabSelection.one enum TabSelection: Hashable { case one, two } var body: some View { TabView(selection: $selectedTab) { Tab("One", systemImage: "1.circle", value: .one) { BugExplanationView() } Tab("Two", systemImage: "2.circle", value: .two) { BugExplanationView() } } .tabViewBottomAccessory { AccessoryView() } } } struct AccessoryView: View { @State private var counter = 0 // This guy's state gets lost (as of iOS 26.1) var body: some View { Stepper("Counter: \(counter)", value: $counter) .padding(.horizontal) } } struct BugExplanationView: View { var body: some View { ScrollView { VStack(alignment: .leading, spacing: 16) { Text("(1) Manipulate the counter state") Text("(2) Then switch tabs") Text("BUG: The counter state gets unexpectedly reset!") } .multilineTextAlignment(.leading) } } }
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625
Feb ’26
Cannot get drop action to trigger (Xcode 26 beta 3)
I'm unable to find the right combination modifiers to get drag and drop to work using the new .draggable(containerItemID:) and dragContainer(for:in:selection:_:) modifiers. The drag is initiated with the item's ID, the item is requested from the .dragContainer modifier, but the drop closure is never triggered. Minimal repro: struct Item: Identifiable, Codable, Transferable { var id = UUID() var value: String static var transferRepresentation: some TransferRepresentation { CodableRepresentation(contentType: .tab) } } struct DragDrop: View { @State var items: [Item] = [ Item(value: "Hello"), Item(value: "world"), Item(value: "something"), Item(value: "else") ] var body: some View { List(items) { item in HStack { Text(item.value) Spacer() } .contentShape(Rectangle()) .draggable(containerItemID: item.id) .dropDestination(for: Item.self) { items, session in print("Drop: \(items)") } } .dragContainer(for: Item.self) { itemID in print("Drag: \(itemID)") return items.filter { itemID == $0.id } } } } #Preview("Simple") { DragDrop() }
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Jul ’25
Animation does not work with List, while works with ScrollView + ForEach
Why there is a working animation with ScrollView + ForEach of items removal, but there is none with List? ScrollView + ForEach: struct ContentView: View { @State var items: [String] = Array(1...5).map(\.description) var body: some View { ScrollView(.vertical) { ForEach(items, id: \.self) { item in Text(String(item)) .frame(maxWidth: .infinity, minHeight: 50) .background(.gray) .onTapGesture { withAnimation(.linear(duration: 0.1)) { items = items.filter { $0 != item } } } } } } } List: struct ContentView: View { @State var items: [String] = Array(1...5).map(\.description) var body: some View { List(items, id: \.self) { item in Text(String(item)) .frame(maxWidth: .infinity, minHeight: 50) .background(.gray) .onTapGesture { withAnimation(.linear(duration: 0.1)) { items = items.filter { $0 != item } } } } } }```
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Feb ’26
.contactAccessPicker shows blank sheet on iOS 26.1
I’m running into an issue using .contactAccessPicker on a device running iOS 26.1 - a blank sheet appears instead of the expected Contact Access Picker. It works on: Simulator (iOS 26.0) Device + Simulator (iOS 18.6) The issue appears specific to real devices on iOS 26.0+. Environment: Device: iPhone 16 Pro iOS Versions Tested: 26.0 and 26.1 Xcode 26.0.1 SwiftUI app, deployment target: iOS 17+ @available(iOS 18.0, *) private var contactPicker: some View { contactsSettingsButton("Title") { showContactPicker = true } .contactAccessPicker(isPresented: $showContactPicker) { _ in Task { await contactManager.fetchContacts() showSelectContacts = true } } } Filed a Feedback: FB20929400 Is there a known workaround?
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3
319
1w
Opting-out of window resizing in iPadOS 26
I have a game app for iOS and iPadOS, which expects a full screen experience. I'd like to out of window resizing in iPadOS 26 as it negatively impacts the UI/UX of the app. I have UIRequiresFullScreen defined, but it doesn't seem to actually force full screen on iPadOS 26 anymore.
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6
Boosts
1
Views
780
Activity
Jul ’25
onScrollPhaseChange doesn't get called when using List
Hi, I can't get onScrollPhaseChange to fire when using a List. It works as expected when using a ScollView and LazyVStack. Interestingly, onScrollGeometryChange gets called as expected for both List and ScrollView. Has anyone successfully used onScrollPhaseChange with a List?
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6
Boosts
1
Views
869
Activity
Jun ’25
List rows partially obscured by navigation bar briefly render fully opaque when switching tabs (iOS 26)
Overview In iOS 26, a List embedded in a NavigationStack inside a TabView exhibits a visual glitch when switching tabs. When the list is scrolled such that some rows are partially obscured by the navigation bar, the system correctly applies a fade/opacity effect to those rows. However, if the user switches to another tab while rows are in this partially obscured (faded) state, those rows briefly flash at full opacity during the tab transition before disappearing. This flash is visually distracting and appears to be inconsistent with the intended scroll-edge opacity behavior. The issue occurs only for rows partially obscured by the navigation bar. Rows partially obscured by the tab bar do not exhibit this flashing behavior. Steps to Reproduce: Run the attached minimal reproduction on iOS 26. Open the first tab. Scroll the list so that some rows are partially hidden behind the navigation bar (showing the native faded appearance). While rows are in this partially faded state, switch to the second tab. Observe that the faded rows briefly render fully opaque during the tab switch. Expected Behavior: Rows that are partially obscured by the navigation bar should maintain consistent opacity behavior during tab transitions, without flashing to full opacity. import SwiftUI @main struct NavBarReproApp: App { /// Minimal repro for iOS 26: /// - TabView with two tabs /// - First tab: NavigationStack + List /// - Scroll so some rows are partially behind the nav bar (faded) /// - Switch tabs: those partially-faded rows briefly flash fully opaque. Partially faded rows under the tab bar do not flash private let items = Array(0..<200).map { "Row \($0)" } var body: some Scene { WindowGroup { TabView { NavigationStack { List { ForEach(items, id: \.self) { item in Text(item) } } .navigationTitle("One") .navigationBarTitleDisplayMode(.inline) } .tabItem { Label("One", systemImage: "1.circle") } NavigationStack { Text("Second tab") .navigationTitle("Two") .navigationBarTitleDisplayMode(.inline) } .tabItem { Label("Two", systemImage: "2.circle") } } } } }
Replies
6
Boosts
0
Views
183
Activity
Jan ’26
NavigationSplitView not fully supported on smaller (SE) iPhones
My SwiftUI code runs fine on macOS, iOS(iPad) and larger iPhones, but will not display the detail view on smaller iPhones. Is there a way to force the smaller iPhones to display the detail view? And if not, When I put the App on the Apple store, for sale, will the Apple store be smart enough to flag the App as not appropriate for smaller iPhones, such as the SE (2nd and 3rd gen.) and prevent downloads? Thanks in advance for any guidance.
Replies
6
Boosts
0
Views
1.2k
Activity
Jul ’25
Screenshot preventing
I’d like to know if Apple currently supports any public API or entitlement for blocking in-app screenshots on iOS. If no such API exists, what is the officially recommended approach for App Store apps to prevent or react to screenshots of sensitive content in a banking app? I have tried using a hidden UITextField with isSecureTextEntry = true and observing UIApplication.userDidTakeScreenshotNotification, but these methods do not block the initial screenshot. Could you please advise how to block screenshots in my app?
Topic: UI Frameworks SubTopic: UIKit
Replies
6
Boosts
0
Views
172
Activity
Jun ’25
SwiftUI @State Updates Not Reflecting in UI Until View Reconstruction (Xcode Preview & Device)
Issue Description I'm experiencing a bizarre SwiftUI state update issue that only occurs in Xcode development environment (both Canvas preview and device debugging), but does not occur in production builds downloaded from App Store. Symptom: User taps a button that modifies a @State variable inside a .sheet Console logs confirm the state HAS changed But the UI does not update to reflect the new state Switching to another file in Xcode and back to ContentView instantly fixes the issue The production build (same code) works perfectly fine Environment Xcode: 16F6 (17C52) iOS: 26.2 (testing on iPhone 13) macOS: 25.1.0 (Sequoia) SwiftUI Target: iOS 15.6+ Issue: Present in both Xcode Canvas and on-device debugging Production: Same code works correctly in App Store build (version 1.3.2) Code Structure Parent View (ContentView.swift) struct ContentView: View { @State private var selectedSound: SoundTheme = .none @State private var showSoundSheet = false var body: some View { VStack { // Display button shows current selection SettingButton( title: "Background Sound", value: getLocalizedSoundName(selectedSound) // ← Not updating ) { showSoundSheet = true } } .sheet(isPresented: $showSoundSheet) { soundSelectionView } } private var soundSelectionView: some View { ForEach(SoundTheme.allCases) { sound in Button { selectedSound = sound // ← State DOES change (confirmed in console) // Audio starts playing correctly audioManager.startAmbientSound(sound) } label: { Text(sound.name) } } } private func getLocalizedSoundName(_ sound: SoundTheme) -> String { // Returns localized name return sound.localizedName }} What I've Tried Attempt 1: Adding .id() modifier SettingButton(...) .id(selectedSound) // Force re-render when state changes Result: No effect Attempt 2: Moving state modification outside withAnimation // Before (had animation wrapper):withAnimation { selectedSound = sound}// After (removed animation):selectedSound = sound Result: No effect Attempt 3: Adding debug print() statements selectedSound = soundprint("State changed: (selectedSound)") // ← Adding this line FIXES the issue! Result: Mysteriously fixes the issue! But removing print() breaks it again. This suggests a timing/synchronization issue in Xcode's preview system. Observations What works: ✅ Console logs confirm state changes correctly ✅ Switching files in Xcode triggers view reconstruction → everything works ✅ Production build from App Store works perfectly ✅ Adding print() statements "fixes" it (likely changes execution timing) What doesn't work: ❌ Initial file load in Xcode ❌ Hot reload / incremental updates ❌ Both Canvas preview and on-device debugging Workaround that works: Click another file in Xcode Click back to ContentView.swift Everything works normally Key Question Is this a known issue with Xcode 16's SwiftUI preview/hot reload system? The fact that: Same exact code works in production Adding print() "fixes" it File switching triggers reconstruction that fixes it ...all suggest this is an Xcode tooling issue, not a code bug. However, it makes development extremely difficult as I can't reliably test changes without constantly switching files or killing the app. What I'm Looking For Confirmation: Is this a known Xcode 16 issue? Workaround: Any better solution than constantly switching files? Root cause: What's causing this state update timing issue? Any insights would be greatly appreciated!
Topic: UI Frameworks SubTopic: SwiftUI
Replies
6
Boosts
0
Views
356
Activity
Dec ’25
touchesEnded: not triggered on newer iOS when view is inside UIScrollView (was working on iOS 18)
Hi everyone, I’m facing an issue with touch handling on newer iOS versions. I have a custom view controller implemented in Objective-C that overrides touchesEnded:. The same code works correctly on iOS 18, but on newer iOS versions (tested on iOS 26), touchesEnded: is no longer being triggered. Important observations: touchesBegan: is triggered. touchesEnded: is NOT triggered. touchesCancelled: is also NOT triggered. No code changes were made between iOS 18 and iOS 26. Same code, same sample works fine in iOS18 device but not in iOS26 device Questions: Has gesture arbitration behavior changed in recent iOS 26 versions when views are inside UIScrollView? Any clarification on whether this is intended behavior or a regression would be greatly appreciated. Thank you.
Topic: UI Frameworks SubTopic: UIKit
Replies
6
Boosts
0
Views
305
Activity
2w
On iPadOS 26 beta, the navigation bar can appear inset underneath the status bar (FB18241928)
On iPadOS 26 beta, the navigation bar can appear inset underneath the status bar (FB18241928) This bug does not happen on iOS 18. This bug occurs when a full screen modal view controller without a status bar is presented, the device orientation changes, and then the full screen modal view controller is dismissed. This bug appears to happen only on iPad, and not on iPhone. This bug happens both in the simulator and on the device. Thank you for investigating this issue.
Replies
6
Boosts
0
Views
531
Activity
Aug ’25
Change tint of back button in UINavigationItem on iOS 26
I am struggling to change the tint of the back button in an UINavigationItem. In iOS 18.6 it looks like this while on iOS 26 the same looks like this I can live without the Dictionary but I'd like to get the blue color back. In viewDidLoad() I have tried navigationItem.backBarButtonItem?.tintColor = .link but this did not work since navigationItem.backBarButtonItem is nil. My second attempt was navigationController?.navigationBar.tintColor = .link but this didn't work either. I have even set the Global Tint to Link Color but this had no effect either. Does anyone have an idea how to change the tint of the back button in an UINavigationItem on iOS 26?
Topic: UI Frameworks SubTopic: UIKit Tags:
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6
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1
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460
Activity
Jan ’26
Liquid Glass TabBar animations causes Hangs, bug with UIKitCore?
With iOS 26.1 we started seeing a bug that only appears on iPhone Air. This bug is visible with simulators too. I have tried so many different ways to fix the issue, but Instruments Profiler is pointing at UIKitCore. We load a tab bar, when the user attempts to switch a tab, the app hangs and never recovers. It happens right as the animation of the Glass bubble is in progress. I have tried a UIKit Tab bar, a SwiftUI Tab bar. I tore out AppDelegate and did a direct @main SwiftUI entry for my application. This issue appears with every tab bar instance I try. I attempted to disable LiquidGlass by utilizing this flag UIDesignRequiresCompatibility in my plist, but the flag seems to be ignored by the system. I am not sure what else to try. I have a trace file if that is helpful. What else can I upload? Here is what the code looks like. struct ContentView: View { @State private var selectedTab = 2 var body: some View { TabView(selection: $selectedTab) { Text("Profile") .tabItem { Label("Me", systemImage: "person") } .tag(0) Text("Training") .tabItem { Label("Training", systemImage: "calendar") } .tag(1) Text("Home") .tabItem { Label("Home", systemImage: "house") } .tag(2) Text("Goals") .tabItem { Label("Goals", systemImage: "target") } .tag(3) Text("Coach") .tabItem { Label("Coach", systemImage: "person.2") } .tag(4) } } } #Preview { ContentView() } and AppView entry point import SwiftUI @main struct RunCoachApp: App { var body: some Scene { WindowGroup { ContentView() } } }
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1
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502
Activity
Dec ’25
Wrong appearance of decimalPad keyboard in dark mode
Hi. The following code causes UI mismatch on iOS26. Keyboard with type decimalPad and appearance as dark is displayed as popUp with wrong colors. Before iOS26 keyboard was regular with correct color scheme. Please advice either how to make the scheme correct or force to display regular keyboard instead of popup. class ViewController: UIViewController { @IBOutlet weak var textField: UITextField! override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view. textField.keyboardType = .decimalPad textField.keyboardAppearance = .dark view.backgroundColor = .darkGray } }
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6
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1
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315
Activity
1w
Detecting marked range in UI/NSTextViews at the time of shouldChangeTextIn
We have submitted a feedback for this issue: FB21230723 We're building a note-taking app for iOS and macOS that uses both UITextView and NSTextView. When performing text input that involves a marked range (such as Japanese input) in a UITextView or NSTextView with a UITextViewDelegate or NSTextViewDelegate set, the text view's marked range (markedTextRange / markedRange()) has not yet been updated at the moment when shouldChangeTextIn is invoked. UITextViewDelegate.textView(_:shouldChangeTextIn:replacementText:) NSTextViewDelegate.textView(_:shouldChangeTextIn:replacementString:) The current behavior is this when entering text in Japanese: (same for NSTextView) func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool { print(textView.markedTextRange != nil) // prints out false DispatchQueue.main.async { print(textView.markedTextRange != nil) // prints out true } } However, we need the value of markedTextRange right away in order to determine whether to return true or false from this method. Is there any workaround for this issue?
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6
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0
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516
Activity
Jan ’26
.contactAccessPicker shows blank sheet on iOS 26.2.1 on device
Calling contactAccessPicker results in a blank sheet and a jetsam error, rather than the expected contact picker, using Apple’s sample code, only on device with iOS 26.2.1. This is happening on a iPhone 17 Pro Max running 26.2.1, and not on a simulator. I’m running Apple's sample project Accessing a person’s contact data using Contacts and ContactsUI Steps: Run the sample app on device running iOS 26.2.1. Use the flow to authorize .limited access with 1 contact: Tap request access, Continue, Select Contacts. Select a contact, Continue, Allow Selected Contact. This all works as expected. Tap the add contact button in the toolbar to add a second contact. Expected: This should show the Contact Access Picker UI. Actual: Sheet is shown with no contents. See screenshot of actual results on iOS device running 26.2.1. Reported as FB21812568 I see a similar (same?) error reported for 26.1. It seems strange that the feature is completely broken for multiple point releases. Is anyone else seeing this or are the two of us running into the same rare edge case? Expected Outcome, seen on simulator running 26.2 Actual outcome, seen on device running 26.2.1
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6
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2
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317
Activity
4d
How to avoid the traffic light buttons on iPad
Right now, the traffic light buttons overlapped on my iPad app top corner on windows mode (full screen is fine). How do I properly design my app to avoid the traffic light buttons? Detect that it is iPadOS 26?
Topic: UI Frameworks SubTopic: SwiftUI
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6
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4
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255
Activity
Sep ’25
NSTextLineFragment crash - how to debug
We have crash reports as shown below that we haven't yet been able to repro and could use some help deubgging. My guess is that the app is giving a label or text view an attributed string with an invalid attribute range, but attributed strings are used in many places throughout the app, and I don't know an efficient way to track this down. I'm posting the stack trace here in hopes that someone more familiar with the internals of the system frameworks mentioned will be able to provide a clue to help narrow where I should look. Fatal Exception: NSRangeException NSMutableRLEArray objectAtIndex:effectiveRange:: Out of bounds 0 CoreFoundation 0x2d5fc __exceptionPreprocess 1 libobjc.A.dylib 0x31244 objc_exception_throw 2 Foundation 0x47130 blockForLocation 3 UIFoundation 0x2589c -[NSTextLineFragment _defaultRenderingAttributesAtCharacterIndex:effectiveRange:] 4 UIFoundation 0x25778 __53-[NSTextLineFragment initWithAttributedString:range:]_block_invoke 5 CoreText 0x58964 TLine::DrawGlyphsWithAttributeOverrides(TLineDrawContext const&, __CFDictionary const* (long, CFRange*) block_pointer, TDecoratorObserver*) const 6 CoreText 0x58400 CTLineDrawWithAttributeOverrides 7 UIFoundation 0x25320 _NSCoreTypesetterRenderLine 8 UIFoundation 0x24b10 -[NSTextLineFragment drawAtPoint:graphicsContext:] 9 UIFoundation 0x3e634 -[NSTextLineFragment drawAtPoint:inContext:] 10 UIFoundation 0x3e450 -[NSTextLayoutFragment drawAtPoint:inContext:] 11 UIKitCore 0x3e3098 __38-[_UITextLayoutFragmentView drawRect:]_block_invoke 12 UIKitCore 0x3e31cc _UITextCanvasDrawWithFadedEdgesInContext 13 UIKitCore 0x3e3040 -[_UITextLayoutFragmentView drawRect:] 14 UIKitCore 0xd7a98 -[UIView(CALayerDelegate) drawLayer:inContext:] 15 QuartzCore 0x109340 CABackingStoreUpdate_ 16 QuartzCore 0x109224 invocation function for block in CA::Layer::display_() 17 QuartzCore 0x917f0 -[CALayer _display] 18 QuartzCore 0x90130 CA::Layer::layout_and_display_if_needed(CA::Transaction*) 19 QuartzCore 0xe50c4 CA::Context::commit_transaction(CA::Transaction*, double, double*) 20 QuartzCore 0x5bd8c CA::Transaction::commit() 21 UIKitCore 0x9f3f0 _UIApplicationFlushCATransaction 22 UIKitCore 0x9c89c __setupUpdateSequence_block_invoke_2 23 UIKitCore 0x9c710 _UIUpdateSequenceRun 24 UIKitCore 0x9f040 schedulerStepScheduledMainSection 25 UIKitCore 0x9cc5c runloopSourceCallback 26 CoreFoundation 0x73f4c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ 27 CoreFoundation 0x73ee0 __CFRunLoopDoSource0 28 CoreFoundation 0x76b40 __CFRunLoopDoSources0 29 CoreFoundation 0x75d3c __CFRunLoopRun 30 CoreFoundation 0xc8284 CFRunLoopRunSpecific 31 GraphicsServices 0x14c0 GSEventRunModal 32 UIKitCore 0x3ee674 -[UIApplication _run] 33 UIKitCore 0x14e88 UIApplicationMain also filed as FB16905066
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6
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1
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522
Activity
Jan ’26
UIAlertController sometimes does not call its UIAlertAction handler
The iOS app that I’m helping to develop displays the following behavior, observed on an iPad Pro (4th generation) running iOS 18.1.1: The app uses UIAlertController to show an action sheet with two buttons (defined by two UIAlertAction objects). Each button has a handler block, and the first thing each handler does is to log that it was called. When the user taps one of the buttons and the action sheet disappears, most of the time the appropriate UIAlertAction handler is called. But sometimes there is no log entry for either of the action handlers, nor does the app do anything else associated with the chosen button, in which case I conclude that the handler was not called. I want to emphasize that I’m describing instances of the same action sheet displayed by the same code. Most of the time the appropriate button handler is called, but sometimes the handler is not called. The uncalled handler problem occurs about once per hour during normal use of the app. The problem has continued to occur across many weeks of testing. What could cause UIAlertController not to call its action handler?
Topic: UI Frameworks SubTopic: UIKit Tags:
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6
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0
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151
Activity
Apr ’25
tabViewBottomAccessory in 26.1: View's @State is lost when switching tabs
Any view that is content for the tabViewBottomAccessory API fails to retain its state as of the last couple of 26.1 betas (and RC). The loss of state happens (at least) when the currently selected tab is switched (filed as FB20901325). Here's code to reproduce the issue: struct ContentView: View { @State private var selectedTab = TabSelection.one enum TabSelection: Hashable { case one, two } var body: some View { TabView(selection: $selectedTab) { Tab("One", systemImage: "1.circle", value: .one) { BugExplanationView() } Tab("Two", systemImage: "2.circle", value: .two) { BugExplanationView() } } .tabViewBottomAccessory { AccessoryView() } } } struct AccessoryView: View { @State private var counter = 0 // This guy's state gets lost (as of iOS 26.1) var body: some View { Stepper("Counter: \(counter)", value: $counter) .padding(.horizontal) } } struct BugExplanationView: View { var body: some View { ScrollView { VStack(alignment: .leading, spacing: 16) { Text("(1) Manipulate the counter state") Text("(2) Then switch tabs") Text("BUG: The counter state gets unexpectedly reset!") } .multilineTextAlignment(.leading) } } }
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6
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4
Views
625
Activity
Feb ’26
Cannot get drop action to trigger (Xcode 26 beta 3)
I'm unable to find the right combination modifiers to get drag and drop to work using the new .draggable(containerItemID:) and dragContainer(for:in:selection:_:) modifiers. The drag is initiated with the item's ID, the item is requested from the .dragContainer modifier, but the drop closure is never triggered. Minimal repro: struct Item: Identifiable, Codable, Transferable { var id = UUID() var value: String static var transferRepresentation: some TransferRepresentation { CodableRepresentation(contentType: .tab) } } struct DragDrop: View { @State var items: [Item] = [ Item(value: "Hello"), Item(value: "world"), Item(value: "something"), Item(value: "else") ] var body: some View { List(items) { item in HStack { Text(item.value) Spacer() } .contentShape(Rectangle()) .draggable(containerItemID: item.id) .dropDestination(for: Item.self) { items, session in print("Drop: \(items)") } } .dragContainer(for: Item.self) { itemID in print("Drag: \(itemID)") return items.filter { itemID == $0.id } } } } #Preview("Simple") { DragDrop() }
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6
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156
Activity
Jul ’25
Animation does not work with List, while works with ScrollView + ForEach
Why there is a working animation with ScrollView + ForEach of items removal, but there is none with List? ScrollView + ForEach: struct ContentView: View { @State var items: [String] = Array(1...5).map(\.description) var body: some View { ScrollView(.vertical) { ForEach(items, id: \.self) { item in Text(String(item)) .frame(maxWidth: .infinity, minHeight: 50) .background(.gray) .onTapGesture { withAnimation(.linear(duration: 0.1)) { items = items.filter { $0 != item } } } } } } } List: struct ContentView: View { @State var items: [String] = Array(1...5).map(\.description) var body: some View { List(items, id: \.self) { item in Text(String(item)) .frame(maxWidth: .infinity, minHeight: 50) .background(.gray) .onTapGesture { withAnimation(.linear(duration: 0.1)) { items = items.filter { $0 != item } } } } } }```
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6
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1
Views
262
Activity
Feb ’26
.contactAccessPicker shows blank sheet on iOS 26.1
I’m running into an issue using .contactAccessPicker on a device running iOS 26.1 - a blank sheet appears instead of the expected Contact Access Picker. It works on: Simulator (iOS 26.0) Device + Simulator (iOS 18.6) The issue appears specific to real devices on iOS 26.0+. Environment: Device: iPhone 16 Pro iOS Versions Tested: 26.0 and 26.1 Xcode 26.0.1 SwiftUI app, deployment target: iOS 17+ @available(iOS 18.0, *) private var contactPicker: some View { contactsSettingsButton("Title") { showContactPicker = true } .contactAccessPicker(isPresented: $showContactPicker) { _ in Task { await contactManager.fetchContacts() showSelectContacts = true } } } Filed a Feedback: FB20929400 Is there a known workaround?
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6
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3
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319
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1w