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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App Clips don't work
We're building a UGC AR app and are leveraging App Clips to distribute AR experiences without app download. Since earlier this week, many of our users are reporting sharing experiences as App Clip doesn't work anymore. They are getting the message "AppClip unavailable" on a little card. We attached a QR code to try it yourself and a link to a different experience. We tried with multiple experiences and on multiple devices already. https://scenery.app/experience/1C925FDE-E49A-489B-BA14-58A4E532E645 Interestingly, we can't pinpoint the issue to an exact device or OS. We tested on many devices and on most, the AppClip is being displayed as unavailable, stating "App Clip unavailable", whereas it works on a few. It all worked fine last week (before September 12th). iPhone 13 Pro Max, iOS26: works iPhone SE, iOS 17: works iPhone 16 Pro, iOS 26: doesn't work iPhone 12 Pro Max, iOS 26: doesn't work iPhone 12 mini, iOS 18: does not work iPad 9th gen, iOS 26: doesn't work Please help. Our users are very dissatisfied as they expect this to work and it's a crucial feature. We already filed a radar via Feedback assistant: FB20303890
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Oct ’25
TipKit: showing a popover tip on a SwiftUI toolbar button
Hi folks, there's currently a known issue in TipKit due to which it won't show popover tips on buttons that are inside a SwiftUI ToolbarItem. For example, if you try this code, the popover tip will not appear: ToolbarItem { Button(action: {...}) { Label("Tap here", systemImage: "gear") } .popoverTip(sampleTip) } There's an easy workaround for this issue. Just apply a style to the button. It can be any style. Some examples are bordered, borderless, plain and borderedProminent. Here's a fixed version of the above code: ToolbarItem { Button(action: {...}) { Label("Tap here", systemImage: "gear") } .buttonStyle(.plain) // Adding this line fixes the issue. .popoverTip(sampleTip) } Hope this helps anyone running into this issue.
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iOS 26.1 UITableView separator style not working
Dear Apple Developer Support, We found that on devices running iOS 26.1 Beta, if we set the separator style of a UITableView to None via xib, the setting will have no effect and the table view cells will show separators. To reproduce this issue, I created a simple project. Please refer to the following screenshots. On iOS 26.0, no separator is showing. However on iOS 26.1, separators are showing. We have already filed a bug report FB20365301. We'd like to know if this is a bug and if it will be fixed before iOS 26.1 is officially released. Thank you.
Topic: UI Frameworks SubTopic: UIKit
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Oct ’25
Slow rendering List backed by SwiftData @Query
Hello, I've a question about performance when trying to render lots of items coming from SwiftData via a @Query on a SwiftUI List. Here's my setup: // Item.swift: @Model final class Item: Identifiable { var timestamp: Date var isOptionA: Bool init() { self.timestamp = Date() self.isOptionA = Bool.random() } } // Menu.swift enum Menu: String, CaseIterable, Hashable, Identifiable { var id: String { rawValue } case optionA case optionB case all var predicate: Predicate<Item> { switch self { case .optionA: return #Predicate { $0.isOptionA } case .optionB: return #Predicate { !$0.isOptionA } case .all: return #Predicate { _ in true } } } } // SlowData.swift @main struct SlowDataApp: App { var sharedModelContainer: ModelContainer = { let schema = Schema([Item.self]) let modelConfiguration = ModelConfiguration(schema: schema, isStoredInMemoryOnly: false) return try! ModelContainer(for: schema, configurations: [modelConfiguration]) }() var body: some Scene { WindowGroup { ContentView() } .modelContainer(sharedModelContainer) } } // ContentView.swift struct ContentView: View { @Environment(\.modelContext) private var modelContext @State var selection: Menu? = .optionA var body: some View { NavigationSplitView { List(Menu.allCases, selection: $selection) { menu in Text(menu.rawValue).tag(menu) } } detail: { DemoListView(selectedMenu: $selection) }.onAppear { // Do this just once // (0..<15_000).forEach { index in // let item = Item() // modelContext.insert(item) // } } } } // DemoListView.swift struct DemoListView: View { @Binding var selectedMenu: Menu? @Query private var items: [Item] init(selectedMenu: Binding<Menu?>) { self._selectedMenu = selectedMenu self._items = Query(filter: selectedMenu.wrappedValue?.predicate, sort: \.timestamp) } var body: some View { // Option 1: touching `items` = slow! List(items) { item in Text(item.timestamp.description) } // Option 2: Not touching `items` = fast! // List { // Text("Not accessing `items` here") // } .navigationTitle(selectedMenu?.rawValue ?? "N/A") } } When I use Option 1 on DemoListView, there's a noticeable delay on the navigation. If I use Option 2, there's none. This happens both on Debug builds and Release builds, just FYI because on Xcode 16 Debug builds seem to be slower than expected: https://indieweb.social/@curtclifton/113273571392595819 I've profiled it and the SwiftData fetches seem blazing fast, the Hang occurs when accessing the items property from the List. Is there anything I'm overlooking or it's just as fast as it can be right now?
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Present User an error message when SwiftData save fails
Have a data model that sets certain fields as unique. If the user attempts to save a duplicate value, the save fails quietly with no indication to the user that the save failed. The program is on Mac OS 26.0.1 @Environment(\.modelContext) var modelContext @Query private var typeOfContracts: [TypeOfContract] @State private var typeName: String = "" @State private var typeCode: String = "" @State private var typeDescription: String = "" @State private var contracts: [Contract] = [] @State private var errorMessage: String? = "Data Entered" @State private var showAlert: Bool = false var body: some View { Form { Text("Enter New Contract Type") .font(.largeTitle) .foregroundStyle(Color(.green)) .multilineTextAlignment(.center) TextField("Contract Type Name", text: $typeName) .frame(width: 800, height: 40) TextField("Contract Type Code", text: $typeCode) .frame(width: 800, height: 40) Text("Contract Type Description") TextEditor(text: $typeDescription) .frame(width: 800, height: 200) .scrollContentBackground(.hidden) .background(Color.teal) .font(.system(size: 24)) Button(action: { self.saveContractType() }) { Text("Save new contract type") } } } func saveContractType() { let typeOfContract = TypeOfContract(contracts: []) typeOfContract.typeName = typeName typeOfContract.typeCode = typeCode typeOfContract.typeDescription = typeDescription modelContext.insert(typeOfContract) do { try modelContext.save() }catch { errorMessage = "Error saving data: \(error.localizedDescription)" } } } I have tried to set alerts but Xcode tells me that the alerts are not in scope
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Oct ’25
Xcode 26 - Crashing Loading Custom TabBarViewController
When I build my app for iPad OS, either 26, or 18.5, as well as iOS on 16.5 from Xcode 26 with UIDesignRequiresCompatibility enabled my app is crashing as it loads the main UIViewController, a subclassed UITabBarController which is being loaded programatically from a Storyboard from another SplashScreen ViewController. On i(Pad)OS 18.5 I get this error: Thread 1: "Could not instantiate class named _TtGC5UIKit17UICoreHostingViewVCS_21ToolbarVisualProvider8RootView_ because no class named _TtGC5UIKit17UICoreHostingViewVCS_21ToolbarVisualProvider8RootView_ was found; the class needs to be defined in source code or linked in from a library (ensure the class is part of the correct target)" On iPadOS 26 I get this error: UIKitCore/UICoreHostingView.swift:54: Fatal error: init(coder:) has not been implemented There is no issue building from Xcode 16.4, regardless of targeted i(Pad)OS.
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Aug ’25
Should setting a UIVisualEffectView's effect to nil remove its visual glass effect?
In the WWDC 2025 session "Build a UIKit app with the with the new design", at the 23:22 mark, the presenter says: And finally, when you no longer need the glass on screen animate it out by setting the effect to nil. The video shows a UIVisualEffectView whose effect is set to a UIGlassEffect animating away as its effect is set to nil. But when I do this in my app (or a sample app), setting effect to nil does not remove the glass appearance. Is this expected? Is the video out of date? Or is this a bug?
Topic: UI Frameworks SubTopic: UIKit Tags:
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Sep ’25
screenshot on iOS26
I had take screenshots by following code let scenes = UIApplication.shared.connectedScenes let windowScene = scenes.first as? UIWindowScene let window = windowScene?.windows.first self.uiImage = window?.rootViewController?.view!.getImage(rect: rect) View has two views. One is ImageView contains some image and overlay of image detection results with .overlay. another view is InfoView contains several info and button which above code fired. on iOS 17, I can take screenshots as I saw, but on iOS26, missing on image of ImageView. Overlay(detected rectangle) in Imageview and InfView can be taken. How can I take screenshots as I saw on iOS26?(iPad)
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StoreKit's manageSubscriptionsSheet view modifier not loading
Our app was just rejected by Apple because they say the subscription management sheet never loads. It just spins indefinitely. We're using StoreKit's manageSubscriptionsSheet view modifier to present the sheet, and it's always worked for us when testing in SandBox. Has anyone else had this problem? Given that it's Apple's own code that got us rejected, what's our path forward?
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Nov ’25
ToolbarItemGroup(placement: .keyboard) is not showed with Sheet
struct ContentView: View {   @State var isPresented = false   var body: some View {     Button {       isPresented.toggle()     } label: {       Text("Button")     }     .sheet(isPresented: $isPresented) {       SubView()     }   } } struct SubView: View {   @State var text = ""   var body: some View {     NavigationStack {       TextEditor(text: $text)         .toolbar {           ToolbarItemGroup(placement: .bottomBar) {             Button("Click") {             }           }           ToolbarItemGroup(placement: .keyboard) {             Button("Click") {             }           }         }     }   } }
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Mar ’25
Summary of iOS/iPadOS 26 UIKit bugs related to UISearchController & UISearchBar using scope buttons
All of these issues appear when the search controller is set on the view controller's navigationItem and the search controller's searchBar has its scopeButtonTitles set. So far the following issues are affecting my app on iOS/iPadOS 26 as of beta 7: When the scopeBarActivation of UISearchController is set to .onSearchActivation, the preferredSearchBarPlacement of the navigationItem is set to .integratedButton, and the searchBarPlacementAllowsToolbarIntegration is set to false (forcing the search icon to appear in the nav bar), on both iPhones and iPads, the scope buttons never appear. They don't appear when the search is activated. They don't appear when any text is entered into the search bar. FB19771313 I attempted to work around that issue by setting the scopeBarActivation to .manual. I then show the scope bar in the didPresentSearchController delegate method and hide the scope bar in the willDismissSearchController. On an iPhone this works though the display is a bit clunky. On an iPad, the scope bar does appear via the code in didPresentSearchController, but when any scope bar button is tapped, the search controller is dismissed. This happens when the app is horizontally regular. When the app on the iPad is horizontally compact, the buttons work but the search bar's text is not correctly aligned within the search bar. Quite the mess really. I still need to post a bug report for this issue. But if issue 1 above is fixed then I don't need this workaround. When the scopeBarActivation of UISearchController is set to .onSearchActivation, the preferredSearchBarPlacement of the navigationItem is set to .stacked, and the hidesSearchBarWhenScrolling property of the navigationItem is set to false (always show the search bar), and this is all used in a UITableViewController, then upon initial display of the view controller on an iPhone or iPad, you are unable to tap on the first row of the table view except on the very bottom of the row. The currently hidden scope bar is stealing the touches. If you activate and then cancel the search (making the scope bar appear and then disappear) then you are able to tap on the first row as expected. The initially hidden scope bar also bleeds through the first row of the table. It's faint but you can tell it's not quite right. Again, this is resolved by activating and then canceling the search once. FB17888632 When the scopeBarActivation of UISearchController is set to .onSearchActivation, the preferredSearchBarPlacement of the navigationItem is set to integrated or .integratedButton, and the toolbar is shown, then on iPhones (where the search bar/icon appears in the toolbar) the scope buttons appear (at the top of the screen) the first time the search is activated. But if you cancel the search and then activate it again, the search bar never appears a second (or later) time. On an iPad the search bar/icon appears in the nav bar and you end up with the same issue as #1 above. FB17890125 Issues 3 and 4 were reported against beta 1 and still haven't been fixed. But if issue 1 is resolved on iPhone, iPad, and Mac (via Mac Catalyst), then I personally won't be affected by issues 2, 3, or 4 any more (but of course all 4 issues need to be fixed). And by resolved, I mean that the scope bar appears and disappears when it is supposed to each and every time the search is activated and cancelled (not just the first time). The scope bar doesn't interfere with touch events upon initial display of the view controller. And there are no visual glitches no matter what the horizontal size class is on an iPad. I really hope the UIKit team can get these resolved before iOS/iPadOS 26 GM.
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Nov ’25
The new navigationLinkIndicatorVisibility modifier crashes on < iOS 26
This new modifier is supposedly backported to iOS 17, but on attempting to use it on the latest iOS 18.5, this happens: Symbol not found: _$s7SwiftUI17EnvironmentValuesV33_navigationIndicatorVisibilityABIAA0G0OvpMV This happens with any usage of the modifier. An availability check won't save you either. The cruelest part of this is that I only need the modifier on iOS 26, lmao. Am I just missing something?
Topic: UI Frameworks SubTopic: SwiftUI
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Oct ’25
ViewBridge to RemoteViewService Terminated (...)
After updating to Sonoma, the following is logged in the Xcode console when an editable text field becomes key. This doesn't occur on any text field, but it seems to happen when the text field is within an NSPopover or an NSSavePanel. ViewBridge to RemoteViewService Terminated: Error Domain=com.apple.ViewBridge Code=18 "(null)" UserInfo={com.apple.ViewBridge.error.hint=this process disconnected remote view controller -- benign unless unexpected, com.apple.ViewBridge.error.description=NSViewBridgeErrorCanceled} What does this mean?
Topic: UI Frameworks SubTopic: AppKit
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Mar ’25
iOS 14 UIPickerView Selected View Background Color
I have noticed that in iOS 14 the UIPickerView has by default a light grey background on the selected Row like shown here. https://developer.apple.com/design/human-interface-guidelines/ios/controls/pickers/ I noticed also that pickerView.showsSelectionIndicator is deprecated on iOS 14. Is there a way to change the background color to white and add separators to achieve a pre iOS 14 UIPickerView style? Thank you
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Jun ’25
NSTextView.shouldDrawInsertionPoint doesn't work with TextKit 2
The following code only ever causes shouldDrawInsertionPoint to be printed (no drawInsertionPoint), but even if that method returns false, the blinking insertion point is still drawn. On the other hand, with TextKit 1 it works as expected. Is there a way to hide the default insertion point in TextKit 2? My app draws its own. I've filed FB13684251. class TextView: NSTextView { override var shouldDrawInsertionPoint: Bool { print("shouldDrawInsertionPoint") return false } override func drawInsertionPoint(in rect: NSRect, color: NSColor, turnedOn flag: Bool) { print("drawInsertionPoint", flag) } } ``
Topic: UI Frameworks SubTopic: AppKit Tags:
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Aug ’25
List jumps back to the top
Following on from this thread: https://developer.apple.com/forums/thread/805037 my list of items is now correctly maintaining state (no more disappearing rows), but I'm now hitting a really annoying issue: Every time something changes - even just changing the dark mode of the device - the entire list of items is refreshed, and the list jumps back to the top. A simple representation: // modelData.filteredItems is either all items or some items, depending on whether the user is searching List { ForEach(modelData.filteredItems) { item in ItemRow(item: item) } } When the user isn't searching, filteredItems has everything in it. When they turn on search, I filter and sort the data in place: // Called when the user turns on search, or when the searchString or searchType changes func sortAndFilterItemsInModelData() { modelData.filteredItems.removeAll() // Remove all items from the filtered array modelData.filteredItems.append(contentsOf: modelData.allItems) // Add all items back in let searchString: String = modelData.searchString.lowercased() switch(modelData.searchType) { case 1: // Remove all items from the filtered array that don't match the search string modelData.filteredItems.removeAll(where: { !$0.name.lowercased().contains(searchString) }) ... } // Sorting switch(modelData.sortKey) { case sortKeyDate: modelData.sortAscending ? modelData.filteredItems.sort { $0.date < $1.date } : modelData.filteredItems.sort { $0.date > $1.date } // Sorts in place ... } } The method doesn't return anything because all the actions are done in place on the data, and the view should display the contents of modelData.filteredItems. If you're searching and there are, say 10 items in the list and you're at the bottom of the list, then you change the search so there are now 11 items, it jumps back to the top rather than just adding the extra ItemRow to the bottom. Yes, the data is different, but it hasn't been replaced; it has been altered in place. The biggest issue here is that you can simply change the device to/from Dark Mode - which can happen automatically at a certain time of day - and you're thrown back to the top of the list. The array of data hasn't changed, but SwiftUI treats it as though it has. There's also a section in the List that can be expanded and contracted. It shows or hides items of a certain type. When I expand it, I expect the list to stay in the same place and just show the extra rows, but again, it jumps to the top. It's a really poor user experience. Am I doing something wrong (probably, yes), or is there some other way to retain the scroll position in a List? The internet suggests switching to a LazyVStack, but I lose left/right swipe buttons and the platform-specific styling. Thanks.
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Oct ’25
iOS 26 Beta 3, UIGlassEffect corner radius
In beta 2 using layer.cornerRadius on a UIEffectView with the UIGlassEffect allowed you to change the corner radius of the view. In beta 3, this no longer works. WWDC videos indicate the right way to do this is to set the cornerConfiguration on the UIEffectView, but that API doesn't seem to be available yet. At this time it doesn't seem like theres a way to have a glass view that isn't pill shaped.
Topic: UI Frameworks SubTopic: UIKit Tags:
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Jul ’25
Specific ARKit node not showing in AR
After two types of objects correctly inserted as nodes in an augmented reality setting, I replicated exactly the same procedure with a third kind of objects that unfortunately refuse to show up. I checked the flow and it is the same as the other objects as well the content of the LocationAnnotation, but there is surely something that escapes me. Could someone help with some ideas? This is the common code, apart of the class: func appendInAR(ghostElement: Ghost){ let ghostElementAnnotationLocation=GhostLocationAnnotationNode(ghost: ghostElement) ghostElementAnnotationLocation.scaleRelativeToDistance = true sceneLocationView.addLocationNodeWithConfirmedLocation(locationNode: ghostElementAnnotationLocation) shownGhostsAnnotations.append(ghostElementAnnotationLocation) }
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Jun ’25