Construct and manage graphical, event-driven user interfaces for iOS or tvOS apps using UIKit.

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What is the scroll edge effect supposed to look like now?
At WWDC the scroll edge effect was presented as a variable blur combined with a soft gradient. Since beta 4 the bottom scroll edge effect has no blur, the top bar sometimes has, but sometimes does not. Even in my own app I have two views with totally different results. This was not changed back in beta 5, so I assume this is not a bug but an intended change. It's hard to design for such a moving target. Especially the missing bottom blur looks bad in a lot of places in my app and I'm debating not shipping the new design if this does not get resolved. Is there any guidance how this effect is supposed to look now? At this point it just seems random and there's no way adjust the way it looks. Phone: Top blur, bottom no blur Settings: Top blur, bottom no blur Notes: No blur at all Music: No blur at all My own app: No top blur My own app: Top blur
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135
Aug ’25
Can we use a class (.self) as the target in addTarget(_:action:for:) for static event handlers?
I am building a centralized event handling system for UIKit controls and gesture recognizers. My current approach registers events using static methods inside a handler class, like this: internal class TWOSInternalCommonEventKerneliOS { internal static func RegisterTouchUpInside(_ pWidget: UIControl) -> Void { pWidget.addTarget( TWOSInternalCommonEventKerneliOS.self, action: #selector(TWOSInternalCommonEventKerneliOS.WidgetTouchUpInsideListener(_:)), for: .touchUpInside ) } @objc internal static func WidgetTouchUpInsideListener(_ pWidget: UIView) -> Void { print("WidgetTouchUpInside") } } This works in my testing because the methods are marked @objc and static, but I couldn’t find Apple documentation explicitly confirming whether using ClassName.self (instead of an object instance) is officially supported. Questions: Is this approach (passing ClassName.self as the target) recommended or officially supported by UIKit? If not, what is the safer alternative to achieve a similar pattern, where event registration can remain in static methods but still follow UIKit conventions? Would using a shared singleton instance as the target (e.g., TWOSInternalCommonEventKerneliOS.shared) be the correct approach, or is there a better pattern? Looking for official guidance to avoid undefined behavior in production.
Topic: UI Frameworks SubTopic: UIKit Tags:
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74
Aug ’25
PaperKit and PKDrawing in iPadOS 26 beta
I’ve been testing out PaperKit from beta 1 up until 3, then took a break and on my return at beta 7 I find that the .drawing property of the PaperMarkup data model has been removed, i.e. a PKDrawing can no longer be added / modified on PaperKit. Also, the shape recognition feature seems to have been removed. I see this as a tremendous drawback. I filed feedback already: FB19893338 Please bring it back.
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Aug ’25
UIGraphicsImageRenderer display blank image with iOS 26
Hello, First of all, I've already made a bug report here : https://feedbackassistant.apple.com/feedback/19731998 I'm facing a problem while using UIGraphicsImageRenderer to create an image, that is use to create a UIColor with a pattern via UIColor(patternImage:). It's well displayed for iOS 18.2 and lower, whereas the whole color is blank with iOS 26. -> Please find a sample project linked to the bug report ViewController.swift post that illustrates the issue, in the ViewController.swift file. I'll also link screenshots of the sample app, one built with iOS 18.2 and another with iOS 26.0. Reproduction steps : I create an image with UIGraphicsImageRenderer : let image = UIGraphicsImageRenderer().image { context in // Do anything here } Then I use this image to create a UIColor : UIColor(patternImage: image) I apply this color to the fillColor of a CAShapeLayer : shapeLayer.fillColor = UIColor(patternImage: image) Expected result : Run on iOS 26 and lower and the layer filled with the pattern color is correctly displayed, as it is on iOS 18.2 and lower. Observed result : Run on iOS 26 and the layer is filled with a blank/white color instead of the intended pattern color. Has anyone been facing the problem ? Thanks, Thibault Poujat
Topic: UI Frameworks SubTopic: UIKit Tags:
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111
Aug ’25
How to get the frame or insets of the new iPadOS 26 window control buttons (close, minimize, fullscreen)?
In iPadOS 26, Apple introduced macOS-style window control buttons (close, minimize, fullscreen) for iPad apps running in a floating window. I'm working on a custom toolbar (UIView) positioned near the top of the window, and I'd like to avoid overlapping with these new controls. However, I haven't found any public API that exposes the frame, layout margins, or safe area insets related to this new UI region. I've checked the window's safeAreaInsets, additionalSafeAreaInsets, and UIWindowSceneDelegate APIs, but none of them seem to reflect the area occupied by these buttons. Is there an officially supported way to: Get the layout information (frame, insets, or margins) of the window control buttons on iPadOS 26? Or, is there a system-defined guideline or padding value we should use to avoid overlapping this new UI? Any clarification or guidance would be appreciated!
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Aug ’25
Issue with custom keyboard height when toggle inputView in iOS 26 beta.
Issue Description: When toggling between the system keyboard and a custom input view, the keyboard height reported in subsequent keyboard notifications becomes incorrect!!! specifically missing the predictive text/suggestion bar height. Environment: Device: iPhone 11 Expected keyboard height: 346pt Actual reported height: 301pt (missing 45pt suggestion bar) Reproduction Steps: Present system keyboard → Height correctly reported as 346pt Switch to custom input view → Custom view displayed Switch back to system keyboard(no suggestion bar) → Height correctly reported as 301pt Trigger keyboard frame change → Height still incorrectly reported as 301pt despite suggestion bar being visible Expected Behavior: Keyboard height should consistently include the suggestion bar height (346pt total). Actual Behavior: After switching from custom input view, keyboard height excludes suggestion bar height (301pt instead of 346pt). key code private func bindEvents() { customTextField.toggleInputViewSubject.sink { [weak self] isShowingCustomInput in guard let strongSelf = self else { return } if isShowingCustomInput { strongSelf.customTextField.inputView = strongSelf.customInputView strongSelf.customInputView.frame = CGRect(x: 0, y: 0, width: strongSelf.view.frame.size.width, height: strongSelf.storedKeyboardHeight) } else { strongSelf.cusTextField.inputView = nil } strongSelf.customTextField.reloadInputViews() strongSelf.customTextField.becomeFirstResponder() }.store(in: &cancellables) }
Topic: UI Frameworks SubTopic: UIKit Tags:
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158
Aug ’25
UICollectionView Drag to edge of screen is not working with Stage Manager
In our app we have a UICollectionView with Drag&Drop functionality enable and collection view is covering the entire screen. When we drag a collection view item to the edge of the screen it does not scroll the UICollectionView instead that our item turns into the app icon and scrolling blocked. It is happening only if Stage Manager is enabled in the device and if Stage Manager is disabled it is working fine. This issue we are facing after iOS 18.6 release, before 18.6 it was working fine i.e, collection view was scrolling to next items when we dragging an item to edge of the screen, similar to the iOS calendar app when we drag an event to edge it starts scrolling the date. And in iOS 26 if we drag an item to edge, Springboard is getting crashed.
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141
Aug ’25
UINavigationController retain cycle in iOS 26
Verbatim of a feedback report (FB18431713) I submitted, duplicated here since we can't see each other's feedbacks, and I wanted a centralized place to track the resolution of this as I'm surely not the only one facing this. When building the app using Xcode 26 beta 2 and running it in an iOS 26 simulator, I'm experiencing a retain cycle in the UINavigationController. From the data I saw in Xcode's memory graph debugger, it seems that _UIViewControllerOneToOneTransitionContext is retaining it. I base this on the fact that the line connecting a view controller and _UIViewControllerOneToOneTransitionContext has a "strong" reference, as indicated in Xcode. (However, I'm reporting this as a retain cycle in UINavigationController, as that's what seems to hold onto this transition-context.)
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150
Aug ’25
SwiftData Fatal error: Editors must register their identifiers before invoking operations on this store
I have a UIKit app where I've adopted SwiftData and I'm struggling with a crash coming in from some of my users. I'm not able to reproduce it myself and as it only happens to a small fraction of my user base, it seems like a race condition of some sort. This is the assertion message: SwiftData/DefaultStore.swift:453: Fatal error: API Contract Violation: Editors must register their identifiers before invoking operations on this store SwiftData.DefaultStore: 00CF060A-291A-4E79-BEC3-E6A6B20F345E did not. (ID is unique per crash) This is the ModelActor that crashes: @available(iOS 17, *) @ModelActor actor ConsumptionDatabaseStorage: ConsumptionSessionStorage { struct Error: LocalizedError { var errorDescription: String? } private let sortDescriptor = [SortDescriptor(\SDConsumptionSession.startTimeUtc, order: .reverse)] static func createStorage(userId: String) throws -> ConsumptionDatabaseStorage { guard let appGroupContainer = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: UserDefaults.defaultAppGroupIdentifier) else { throw Error(errorDescription: "Invalid app group container ID") } func createModelContainer(databaseUrl: URL) throws -> ModelContainer { return try ModelContainer(for: SDConsumptionSession.self, SDPriceSegment.self, configurations: ModelConfiguration(url: databaseUrl)) } let databaseUrl = appGroupContainer.appendingPathComponent("\(userId).sqlite") do { return self.init(modelContainer: try createModelContainer(databaseUrl: databaseUrl)) } catch { // Creating the model storage failed. Remove the database file and try again. try? FileManager.default.removeItem(at: databaseUrl) return self.init(modelContainer: try createModelContainer(databaseUrl: databaseUrl)) } } func isStorageEmpty() async -> Bool { (try? self.modelContext.fetchCount(FetchDescriptor<SDConsumptionSession>())) ?? 0 == 0 // <-- Crash here! } func sessionsIn(interval: DateInterval) async throws -> [ConsumptionSession] { let fetchDescriptor = FetchDescriptor(predicate: #Predicate<SDConsumptionSession> { sdSession in if let startDate = sdSession.startTimeUtc { return interval.start <= startDate && interval.end > startDate } else { return false } }, sortBy: self.sortDescriptor) let consumptionSessions = try self.modelContext.fetch(fetchDescriptor) // <-- Crash here! return consumptionSessions.map { ConsumptionSession(swiftDataSession: $0) } } func updateSessions(sessions: [ConsumptionSession]) async throws { if #unavailable(iOS 18) { // Price segments are duplicated if re-inserted so unfortunately we have to delete and reinsert sessions. // On iOS 18, this is enforced by the #Unique macro on SDPriceSegment. let sessionIds = Set(sessions.map(\.id)) try self.modelContext.delete(model: SDConsumptionSession.self, where: #Predicate<SDConsumptionSession> { sessionIds.contains($0.id) }) } for session in sessions { self.modelContext.insert(SDConsumptionSession(consumptionSession: session)) } if self.modelContext.hasChanges { try self.modelContext.save() } } func deleteAllSessions() async { if #available(iOS 18, *) { try? self.modelContainer.erase() } else { self.modelContainer.deleteAllData() } } } The actor conforms to this protocol: protocol ConsumptionSessionStorage { func isStorageEmpty() async -> Bool func hasCreditCardSessions() async -> Bool func sessionsIn(interval: DateInterval) async throws -> [ConsumptionSession] func updateSessions(sessions: [ConsumptionSession]) async throws func deleteAllSessions() async } The crash is coming in from line 30 and 41, in other words, when trying to fetch data from the database. There doesn't seem to be any common trait for the crashes. They occur across iOS versions and device types. Any idea what might cause this?
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Aug ’25
iOS 26 (beta) Nav Bar Item Image Insets bug
I've noticed that in iOS 26, Navigation Bar Items' Image Insets parameters as set in Xcode are not being read correctly. Specifically, it appears that on iOS 26 beta, negative inset numbers are being read as positive. Feedback report FB19838333 includes a sample project demonstrating this bug.
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190
Aug ’25
Compositional Layout's broken `visibleItemsInvalidationHandler`
Hello everybody! TLDR: Issues with visibleItemsInvalidationHandler. Minimal code to reproduce available. I've been working with Compositional Layout for a while now and recently I've found myself needing to implement custom animation based on scroll position of UI elements. Once I found visibleItemsInvalidationHandler it felt like the exact solution that I needed. Once I implement I've found out it doesn't quite behave as you'd expect. To put it simply, it seems like the animations only work if your whole layout does not use .estimated nor .uniformAcrossSiblings. As soon as you use them then the animations will stop working, I've debugged it deeper and it seems like the invalidation context generated by it does not include the indexPath of the cells, which is always included in the version in which it works. Feel free to swap the line 51 with its comment to flip between the working and failing version of it. Playground Example My final question therefore is... Is this the expected behavior? The documentation doesn't give any clues about such behavior and although I've tried relentlessly to find a workaround for this specific hiccup I was not successful with it.
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Aug ’25
Do we need to explicitly register all high-level interaction events for every widget in UIKit?
I have a question about how UIKit expects us to handle interaction events at scale. From what I understand so far: For UIControls (UIButton, UISwitch, UITextField, etc.), we explicitly register with addTarget(_:action:for:). For gestures, we add UIGestureRecognizer instances to views. For UIView subclasses, we can override touch methods like touchesBegan/touchesEnded. All of this must be done on the main thread, since UIKit isn’t thread-safe. Now here’s my main concern If I have a complex UI with hundreds or thousands of widgets, am I expected to perform these registrations individually for each widget and each high-level event (tap, long press, editing changed, etc.)? Or does UIKit provide a more centralized mechanism? In short: Is per-widget, per-event registration the “normal” UIKit approach, or are there best practices for scaling event handling without writing thousands of addTarget or addGestureRecognizer calls? Thanks!
Topic: UI Frameworks SubTopic: UIKit Tags:
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104
Aug ’25
Modal Presentation in UIKit Adds Solid Background in iOS 26
Hello, I have a number of UIViewControllers that are presented as follows: vc.modalPresentationStyle = UIModalPresentationStyle.popover vc.modalTransitionStyle = UIModalTransitionStyle.coverVertical self.present(vc, animated: true, completion: nil) The VC is designed from a Storyboard where I set the 'view' of the VC to have a .clear 'backgroundColor', I have a smaller 'Alert View' added as a subview which is what the user interacts with. In iOS 13 - iOS 18 this would present modally, not take up the entire screen and allow the user to see relevant context from the screen underneath. In iOS 26 Beta 5 and every beta prior the system injects a 'UIDropShadowView' in the View Hierarchy, this view has a solid color backdrop, either white/black depending on light/dark mode. This causes all underlying content to be blocked and essentially forces a full screen modal presentation despite the existing design. I am looking for a way to remove this solid color. I'm not sure if it's intentional or a bug / oversight. I have been able to remove it in a hacky way, I cycle the view hierarchy to find 'UIDropShadowView' and set it's backdrop to transparent. However when you swipe down to partially dismiss the view it turns to Liquid Glass when it is around 75% dismissed and then resets the background color to white/black. I tried creating a custom UIViewControllerTransitioningDelegate so that I could re-implement the existing behaviour but it's incredibly difficult to mimic the partial dismiss swipe down effect on the VC. I have also tried changing my presentation to: vc.modalPresentationStyle = UIModalPresentationStyle.overFullScreen vc.modalTransitionStyle = UIModalTransitionStyle.crossDissolve This works but then the user loses the ability to interactively swipe to dismiss. Any help would be appreciated. Thank you!
Topic: UI Frameworks SubTopic: UIKit Tags:
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Aug ’25
UIKit crash on app built with Xcode 26 but run on iOS 18.X
An app built on Xcode 26 (beta4) presents various UIViewCOntrollers. Presentation of any UIViewController that contains a UIToolbar leads to a UIKit crash when run on an iOS 18.5 device, it does not crash when run on iOS 26. The exception logged: *** Terminating app due to uncaught exception 'NSInvalidUnarchiveOperationException', reason: '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)' Anyone else seen this? I've submitted a bug report via Feedback Assistant, including a minimal Xcode workspace that reproduces the crash, hoping this will get some attention.
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Aug ’25
Display segmented control in iOS 26 with the previous rounded rectangle style
The default style for a segmented picker in iOS 26 is now a capsule shape. Is it possible to get back the previous rounded rectangle shape? In SwiftUI I have tried using the clipShape, containerShape, and background modifiers, applying a RoundedRectangle shape with a corner radius, to no avail. In UIKit I have tried to adjust the corner configuration for the UISegmentedControl, also to no avail. Am I missing something really obvious or is it impossible to change the style here? 🤔
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Aug ’25
UIScene.ConnectionOptions.shouldHandleActiveWorkoutRecovery Missing?
According to the WWDC25 Presentation Track workouts with HealthKit on iOS and iPadOS, there is supposed to be a new property for restoring an active workout after a crash on iOS/iPadOS. The developer documentation also supports this. However, this property does not seem to exist in the latest Xcode 26 beta, even in projects targeting iOS 26.0 as the minimum version. Am I missing something? Has this property not been made available yet? It is actually looking like all of the new iOS 26.0 properties are missing UIScene.ConnectionOptions on my system.
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Aug ’25
iPadOS 26 Disable "open recent"
How can I remove the "recents" section from long-pressing on my app icon? I've added the following to my AppDelegate, which removes it from the top MenuBar, but not from the app icon context menu. My app has registered a custom filetype, but it is not a document based app. Opening files imports them into the app's user library, and so does not make sense to have a "recents" list. override func buildMenu(with builder: any UIMenuBuilder) { super.buildMenu(with: builder) builder.remove(menu: .openRecent) }
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Aug ’25
Xcode 26 Beta 3 Crash on iOS 18 Simulators - NSInvalidUnarchiveOperationException (ToolbarVisualProvider8RootView missing)
Hi, I’m seeing a crash when running my app on iOS 18 simulators or devices using Xcode 26 beta 3. My app’s minimum deployment target is iOS 17, and the crash does not happen when running from Xcode 16.4. The crash occurs specifically at this line: return UIStoryboard(name: storyboard.rawValue, bundle: nil) .instantiateViewController(withIdentifier: view.rawValue) Crash Details: ** Terminating app due to uncaught exception 'NSInvalidUnarchiveOperationException', reason: '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)' *** First throw call stack: (0x191c3321c 0x18f0cdabc 0x191c91ea0 0x19d740774 0x19d740a18 0x19d740cac 0x194626680 0x194dbc784 0x19d740890 0x19d740cac 0x1949aadd8 0x19d740890 0x19d740a18 0x19d740cac 0x194802e24 0x1945f008c 0x194ed1808 0x107a8bfa0 0x107a8c05c 0x1945ec128 0x19d740890 0x19d740cac 0x1945eba60 0x19d740890 0x19d740a18 0x19d740cac 0x1945f07dc 0x1945eaea4 0x19492ee80 0x10763de00 0x1076e56fc 0x1076e5674 0x1076e5e04 0x19496108c 0x194f9b9a0 0x1949072c4 0x194f998cc 0x194f9af04 0x19445139c 0x19445ac28 0x194467508 0x1079afaec 0x1079aff5c 0x1944189a0 0x194417be4 0x1944114e4 0x194411404 0x194410ab4 0x19440c1e4 0x191b28a8c 0x191b288a4 0x191b28700 0x191b29080 0x191b2ac3c 0x1ded09454 0x19453d274 0x194508a28 0x1073564f4 0x1b89fff08) terminating due to uncaught exception of type NSException The crash occurs immediately at app launch, when attempting to load a storyboard-based UITabBarController. Works as expected on: Xcode 16.4 + iOS 18 (simulator/device) Xcode 26 beta 3 + iOS 26 (simulator/device) Running from Xcode 26 beta 3 onto iOS 18 simulators or devices and it immediate crash from the particular storyboard Setup: Xcode: 26 beta 3 macOS: 15.5 iOS Simulators: iOS 18.5 Minimum deployment target: iOS 17 UIKit-based app (not using SwiftUI) No custom toolbars or host views in use explicitly Is this a known compatibility issue when building with the iOS 26 SDK and running on iOS 18? Are there any workarounds or recommendations for running apps targeting iOS 17+ on iOS 18 simulators when using Xcode 26?
Topic: UI Frameworks SubTopic: UIKit Tags:
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476
Aug ’25