I am using a LayzVStack embedded into a ScrollView. The list items are fetched from a core data store by using a @FetchResult or I tested it also with the new @Query command coming with SwiftData.
The list has one hundred items 1, 2, 3, ..., 100.
The user scrolled the ScrollView so that items 50, 51, ... 60 are visible on screen.
Now new data will be fetched from the server and updates the CoreData or SwiftData model. When I add new items to the end of the list (e.g 101, 102, 103, ...) then the ScrollView is keeping its position.
Opposite to this when I add new items to the top (0, -1, -2, -3, ...) then the ScrollView scrolls down.
Is there a way with the new SwiftData and SwiftUI ScrollView modifiers to update my list model without scrolling like with UIKit where you can query and set the scroll offset pixel wise?
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.
Selecting any option will automatically load the page
Post
Replies
Boosts
Views
Activity
How can we performantly scroll to a target location using TextKit 2?
Hi everyone,
I'm building a custom text editor using TextKit 2 and would like to scroll to a target location efficiently. For instance, I would like to move to the end of a document seamlessly, similar to how users can do in standard text editors by using CMD + Down.
Background:
NSTextView and TextEdit on macOS can navigate to the end of large documents in milliseconds. However, after reading the documentation and experimenting with various ideas using TextKit 2's APIs, it's not clear how third-party developers are supposed to achieve this.
My Code:
Here's the code I use to move the selection to the end of the document and scroll the viewport to reveal the selection.
override func moveToEndOfDocument(_ sender: Any?) {
textLayoutManager.ensureLayout(for: textLayoutManager.documentRange)
let targetLocation = textLayoutManager.documentRange.endLocation
let beforeTargetLocation = textLayoutManager.location(targetLocation, offsetBy: -1)!
textLayoutManager.textViewportLayoutController.layoutViewport()
guard let textLayoutFragment = textLayoutManager.textLayoutFragment(for: beforeTargetLocation) else {
return
}
guard let textLineFragment = textLayoutFragment.textLineFragment(for: targetLocation, isUpstreamAffinity: true) else {
return
}
let lineFrame = textLayoutFragment.layoutFragmentFrame
let lineFragmentFrame = textLineFragment.typographicBounds.offsetBy(dx: 0, dy: lineFrame.minY)
scrollToVisible(lineFragmentFrame)
}
While this code works as intended, it is very inefficient because ensureLayout(_:) is incredibly expensive and can take seconds for large documents.
Issues Encountered:
In my attempts, I have come across the following two issues.
Estimated Frames: The frames of NSTextLayoutFragment and NSTextLineFragment are approximate and not precise enough for scrolling unless the text layout fragment has been fully laid out.
Laying out all text is expensive: The frames become accurate once NSTextLayoutManager's ensureLayout(for:) method has been called with a range covering the entire document. However, ensureLayout(for:) is resource-intensive and can take seconds for large documents. NSTextView, on the other hand, accomplishes the same scrolling to the end of a document in milliseconds.
I've tried using NSTextViewportLayoutController's relocateViewport(to:) without success. It's unclear to me whether this function is intended for a use case like mine. If it is, I would appreciate some guidance on its proper usage.
Configuration:
I'm testing on macOS Sonoma 14.5 (23F79), Swift (AppKit), Xcode 15.4 (15F31d).
I'm working on a multi-platform project written in AppKit and UIKit, so I'm looking for either a single solution that works in both AppKit and UIKit or two solutions, one for each UI framework.
Question:
How can third-party developers scroll to a target location, specifically the end of a document, performantly using TextKit 2?
Steps to Reproduce:
The issue can be reproduced using the example project (download from link below) by following these steps:
Open the example project.
Run the example app on a Mac. The example app shows an uneditable text view in a scroll view. The text view displays a long text.
Press the "Move to End of Document" toolbar item.
Notice that the text view has scrolled to the bottom, but this took several seconds (~3 seconds on my MacBook Pro 16-inch, 2021). The duration will be shown in Xcode's log.
You can open the ExampleTextView.swift file and find the implementation of moveToEndOfDocument(_:). Comment out line 84 where the ensureLayout(_:) is called, rerun the app, and then select "Move to End of Document" again. This time, you will notice that the text view moves fast but does not end up at the bottom of the document.
You may also open the large-file.json in the project, the same file that the example app displays, in TextEdit, and press CMD+Down to move to the end of the document. Notice that TextEdit does this in mere milliseconds.
Example Project:
The example project is located on GitHub:
https://github.com/simonbs/apple-developer-forums/tree/main/how-can-we-performantly-scroll-to-a-target-location-using-textkit-2
Any advice or guidance on how to achieve this with TextKit 2 would be greatly appreciated.
Thanks in advance!
Best regards,
Simon
Is anyone else getting new warning about menu items with submenus when running on Tahoe? I'm getting big performance problems using my menu as well as seeing these messages and I'm wondering if there's a connection.
My app is faceless with a NSStatusItem with an NSMenu. Specifically it's my own subclass of NSMenu where I have a lot of code to manage the menu's dynamic behavior. This code is directly in the menu subclass instead of in a controller because the app I forked had it this way, a little wacky but I don't see it being a problem. A nib defines the contents of the menu, and it's instantiated manually with code like:
var nibObjects: NSArray? = []
guard let nib = NSNib(nibNamed: "AppMenu", bundle: nil) else { ... }
guard nib.instantiate(withOwner: owner, topLevelObjects: &nibObjects) else { ... }
guard let menu = nibObjects?.compactMap({ $0 as? Self }).first else { ... }
Within that nib.instantiate call I see a warning logged that seems new to Tahoe, before the menu's awakeFromNib is called, that says (edited):
Internal inconsistency in menus - menu <NSMenu: 0x6000034e5340> believes it has <My_StatusItem_App.AppMenu: 0x7f9570c1a440> as a supermenu, but the supermenu does not seem to have any item with that submenu
My_StatusItem_App.AppMenu: 0x7f9570c1a440 is my menu belonging to the NSStatusItem, NSMenu: 0x6000034e5340 is the submenu of one of its menu items.
At a breakpoint in the NSMenu subclass's awakeFromNib I print self and see clear evidence of the warning's incorrectness. Below is a snippet of the console including the full warning, only edited for clarity and brevity. It shows on line 32 menu item with placeholder title "prototype batch item" that indeed has that submenu.
Internal inconsistency in menus - menu <NSMenu: 0x6000034e5340>
Title:
Supermenu: 0x7f9570c1a440 (My StatusItem App), autoenable: YES
Previous menu: 0x0 (None)
Next menu: 0x0 (None)
Items: (
"<NSMenuItem: 0x6000010e4fa0 Do The Thing Again, ke mask='<none>'>",
"<NSMenuItem: 0x6000010e5040 Customize\U2026, ke mask='<none>'>",
"<NSMenuItem: 0x6000010e50e0, ke mask='<none>'>"
) believes it has <My_StatusItem_App.AppMenu: 0x7f9570c1a440>
Title: My StatusItem App
Supermenu: 0x0 (None), autoenable: YES
Previous menu: 0x0 (None)
Next menu: 0x0 (None)
Items: (
) as a supermenu, but the supermenu does not seem to have any item with that submenu
(lldb) po self
<My_StatusItem_App.AppMenu: 0x7f9570c1a440>
Title: My StatusItem App
Supermenu: 0x0 (None), autoenable: YES
Previous menu: 0x0 (None)
Next menu: 0x0 (None)
Items: (
"<NSMenuItem: 0x6000010fd7c0 About My StatusItem App\U2026, ke mask='<none>', action: showAbout:, action image: info.circle>",
"<NSMenuItem: 0x6000010fd860 Show Onboarding Window\U2026, ke mask='Shift', action: showIntro:>",
"<NSMenuItem: 0x6000010fd900 Update Available\U2026, ke mask='<none>', action: installUpdate:, standard image: icloud.and.arrow.down, hidden>",
"<NSMenuItem: 0x6000010e46e0, ke mask='<none>'>",
"<NSMenuItem: 0x6000010e4780 Start The Thing, ke mask='<none>', action: startTheThing:>",
"<NSMenuItem: 0x6000010e4dc0 \U2318-\U232b key detector item, ke mask='<none>', view: <My_StatusItem_App.KeyDetectorView: 0x7f9570c1a010>>",
"<NSMenuItem: 0x6000010e4e60, ke mask='<none>'>",
"<NSMenuItem: 0x6000010e4f00 saved batches heading item, ke mask='<none>', view: <NSView: 0x7f9570b4be10>, hidden>",
"<My_StatusItem_App.BatchMenuItem: 0x6000016e02c0 prototype batch item, ke mask='<none>', action: replaySavedBatch:, submenu: 0x6000034e5340 ()>",
"<NSMenuItem: 0x6000010f7d40, ke mask='<none>'>",
"<My_StatusItem_App.ClipMenuItem: 0x7f956ef14fd0 prototype copy clip item, ke mask='<none>', action: copyClip:>",
"<NSMenuItem: 0x6000010fa620 Settings\U2026, ke='Command-,', action: showSettings:>",
"<NSMenuItem: 0x6000010fa6c0, ke mask='<none>'>",
"<NSMenuItem: 0x6000010fa760 Quit My StatusItem App, ke='Command-Q', action: quit:>"
)
Is this seemingly incorrect inconsistency message harmless? Am I only grasping at straws to think it has some connection to the performance issues with this menu?
Adding environment value openURL or dismiss to a View in a NavigationStack, without even using it, causes an infinite refresh loop.
What doesn't work:
a)
struct ViewA: View {
@State private var path = NavigationPath()
var body: some View {
NavigationStack(path: $path) {
ViewB()
}
}
}
struct ViewB: View {
@Environment(\.openURL) var openURL
var body: some View {
NavigationLink("Next", value: 1)
.navigationDestination(for: Int.self, destination: itemView)
}
func itemView(_ item: Int) -> some View {
Text("Item \(item)")
}
}
Prints ViewB: _openURL changed. infinitely.
b) Passing the path to ViewB and appending the value with a Button
What works:
a)
.navigationDestination(for: Int.self) {
Text("Item \($0)")
}
Prints
ViewB: @self, @identity, _openURL changed.
ViewB: @self, _openURL changed.
ViewB: _openURL changed. (3 times)
b) Handling the destination on ViewA, which is not ideal for my use case.
Prints
ViewB: @self, @identity, _openURL changed.
ViewB: _openURL changed. (5 times)
While the workaround would work, it is still unclear how the environment value can cause the freeze (and eventual crash). Also that passing a function as parameter fails, while providing the destination in place does not. The code is stripped down to the minimal reproducible version. Any thoughts?
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
My app is a SwiftUI document based app using DocumentGroupLaunchScene. In iOS(iPadOS) 18.4, when it launches, it has duplicate toolbar items, and when I close the current document and open other documents, it adds more duplicates. It also shows a wrong document name, which shows the first opened document name. This issue can be reproduced in the sample code (Building a document-based app with SwiftUI).
I have submitted Feedback (FB17025216), but not sure if this is a known bug or if I'm missing anything.
In tvOS 18 the onMoveCommand is missing the first press after a view is loaded and every time the direction is changed. It also misses the first press on a button after a focus change. This appears to only impact the newer silver remote and not the older black remote or IR remotes.
With the code bellow press any direction 3 times and it will only log twice.
struct ButtonTest: View {
var body: some View {
VStack {
Button {
debugPrint("button 1")
} label: {
Text("Button 1")
}
Button {
debugPrint("button 2")
} label: {
Text("Button 2")
}
Button {
debugPrint("button 3")
} label: {
Text("Button 3")
}
}
.onMoveCommand(perform: { direction in
debugPrint("move \(direction)")
})
.padding()
}
}
I work on a universal app that targets both iPhone and iPad. Our iPad app currently requires full screen. When testing on the latest iPadOS 26 beta, we see the following warning printed to the console:
Update the Info.plist: 1) `UIRequiresFullScreen` will soon be ignored. 2) Support for all orientations will soon be required.
It will take a fair amount of effort to update our app to properly support presentation in a resizable window. We wanted to gauge how urgent this change is. Our testing has shown that iPadOS 26 supports our app in a non-resizable window.
Can someone from Apple provide any guidance as to how soon “soon” is? Will UIRequiresFullScreen be ignored in iPadOS 26? Will support for all orientations be required in iPadOS 26?
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?
Is there a way to display a .icon file in SwiftUI? I want to show the app icon in the app itself but exporting and including the app icon as a PNG feels redundant. This would consume a lot of unnecessary storage especially when including a lot of alternative app icons. There has to be a better way
Otherwise I would file a feedback for that
Thank you
Basic Information
Please provide a descriptive title for your feedback:
Sheet presentationDetents breaks after rapid open/dismiss cycles
Which platform is most relevant for your report?
iOS
Description
Steps to Reproduce:
Create a sheet with presentationDetents([.medium])
Rapidly perform these actions multiple times (usually 3-4 times):
a. Open the sheet
b. Immediately scroll down to dismiss
Open the sheet again
Observe that the sheet now appears at .large size, ignoring the .medium detent
Expected Result:
Sheet should consistently maintain .medium size regardless of how quickly
it is opened and dismissed.
Actual Result:
After rapid open/dismiss cycles, the sheet ignores .medium detent and
appears at .large size.
Reproduction Rate:
Occurs consistently after 3-4 rapid open/dismiss cycles
More likely to occur with faster open/dismiss actions
Configuration:
iOS 18
Xcode 16.0 (16A242d)
SwiftUI
Device: iPhone 14
When I update a variable inside my model that is marked @Transient, my view does not update with this change. Is this normal? If I update a non-transient variable inside the model at the same time that I update the transient one, then both changes are propagated to my view.
Here is an example of the model:
@Model public class WaterData {
public var target: Double = 3000
@Transient public var samples: [HKQuantitySample] = []
}
Updating samples only does not propagate to my view.
i export apple SF as custom sf for test.
code is simple:
var body: some ControlWidgetConfiguration {
StaticControlConfiguration(
kind:"ControlWidgetConfiguration"
) {
ControlWidgetButton(action: DynamicWidgetIntent()) {
Text("test")
Image("custom_like")
}
}.displayName("test")
}
as we can see, it can't show image in the preview. but it can show image in the Control widget center.
am i do some thing wrong?
"Use location, address and addressRepresentations instead"
Is it possible to know what kind of "Address" a MapItem is representing (State, County, Neighborhood etc) after a MKGeocodingRequest?
Is it possible to find out the CLRegion or similar of an map item. (Now when we cannot read it from the Placemark)
Playing around with the new TabViewBottomAccessoryPlacement API, but can't figure out how to update the value returned by @Environment(\.tabViewBottomAccessoryPlacement) var placement.
I want to change this value programmatically, want it to be set to nil or .none on app start until user performs a specific action. (taps play on an item which creates an AVPlayer instance).
Documentation I could find: https://developer.apple.com/documentation/SwiftUI/TabViewBottomAccessoryPlacement
Looking to see if anyone has experienced this issue, and is aware of any workarounds.
With an app migrating towards SwiftUI Views but still using UIKit for primary navigation, my app makes use of UIHostingController to push SwiftUI Views onto a UINavigationController stack in a lot of areas. With iOS 26, I notice that SwiftUI's Menu view really struggles to present when contained in a UIHostingController. An error is logged to the console on presentation, and depending on the UI, the Menu won't present inside of it's container, or will jump around the screen.
The bug, it seems is based in a private class UIReparentingView and I am curious if anyone has found a work around for this issue. The error reported is:
Adding '_UIReparentingView' as a subview of UIHostingController.view is not supported and may result in a broken view hierarchy. Add your view above UIHostingController.view in a common superview or insert it into your SwiftUI content in a UIViewRepresentable instead.
The simplest way to see this issue is to create a new storyboard based project. From the ViewController present a UIHostingController with a SwiftUI view that has a Menu and then simply tap to open the Menu. Thanks for any input!
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
All of a sudden, after iOS 18.4 was released, I am having tons of navigation problems in my app in production. Buttons navigating to empty pages, views seeming to 'freeze', top navigation bar mismatched with the content of the page. It seems that iOS 18.4 broke a critical piece of UIKit + SwiftUI bridging functionality that my project relies on.
** Originally posted in 'Core OS' topic but realized 'UI Frameworks > General' made more sense. My bad. **
My application is written with both UIKit and SwiftUI components. Here is a breakdown of my setup:
UIApplicationDelegate >
UIWindow >
rootViewController of window is a UITabBarController >
each tab is a UINavigationController
rootViewController of nav controller is a UIHostingController >
rootView of the hosting controller is a SwiftUI View
In my SwiftUI views, I have been using NavigationLink for horizontal 'push' style navigation in my SwiftUI views. I do not use NavigationView, I only rely on the bridging capabilities of UINavigationController to action on my NavigationLinks. This has never been an issue, until iOS 18.4 was released. Now, when running iOS 18.4, I am having all sorts of unexpected behavior in the UI. I will break down 2 of these use cases here:
Use case A:
In one of my SwiftUI views, I have a ForEach for which each element's view is a NavigationLink. This is using the NavigationLink(_ destination:,label:) initializer. Navigating forward from here works/looks normal.
However, once I try to navigate backward from that destination (tap the 'Back' button in top left), the view goes blank and the navigation bar at the top of the page (which is maintained by the UINavigationController instance) does not change. If I call popToRootViewController on that nav controller, the navigation bar at the top of the page returns to its normal state, but the view is still blank.
It is not until after I have called popToRootViewController, and then navigate to a different tab of the UITabBarController and return to the initial tab, does the SwiftuI content view (the one with the ForEach) finally redraw and the view hierarchy is restored.
Here is a warning that is logged in the console when I tap the 'Back ' button:
Top view controller's view unexpectedly not in window for navigation transition. Skipping layout. nav = <UINavigationController: 0x1110bbe00>, topVC = <TtGC7SwiftUI19UIHostingControllerV5MyApp10MyPage: 0x106814e00>
EDIT: If I replace the NavigationLink with a call to UINavigationController.pushViewController, I am still seeing the exact same behavior. Pressing back button makes the view empty > need to pop to root view controller and switch tabs in order to restore the view.
Use case B
Another instance of this issue happens whenever I try to use a NavigationLink inside of a view that itself was the destination of a NavigationLink in its parent view (i.e.: Root view > detail view > sub-detail view). For example, take the detail view destination in use case A. I have tapped a NavigationLink from the ForEach and landed on the detail view. Again, so far things work/look normal. Now, if I tap on another NavigationLink from that detail view, the view does not transition to the new page. The top navigation bar does transition, and shows the title and actions associated with this second destination. However, the view of this second destination is not displayed.
It is worth noting that the same warning I mentioned above is also logged when I tap the NavigationLink to navigate to this second destination.
Top view controller's view unexpectedly not in window for navigation transition. Skipping layout. nav = <UINavigationController: 0x109859400>, topVC = <TtGC7SwiftUI19UIHostingControllerVVS_19BridgedPresentation8RootView: 0x300ab8000>
Strangely, if I switch to a different tab of the UITabBarController and back to the initial tab, this second destination's view is successfully rendered. It seems that switching tabs in this UITabBarController is calling something in either SwiftUI or UIKit that is redrawing my views.
Conclusion
This is a serious issue with UIKit + SwiftUI bridging support. I have never had problems like this until devices started running iOS 18.4, and there is nothing in the iOS 18.4 changelog that suggests this was an intentional change. All of a sudden, after updating to the latest iOS version, my app is totally broken.
I want to be clear that I'm not using deprecated NavigationLink methods in these instances. My app's minimum deployment target is iOS 16.
I know that there are more modern navigation APIs like navigation stack, etc. I am looking for answers about my use case: whether it is officially unsupported as of iOS 18.4, whether this setup should be supported and this is indeed some sort of bug in iOS, or anything in-between. I'm happy to provide formatted code if needed for discussion purposes. This is about my entire app's view hierarchy so there are a lot of disparate lines of code that make up this problem.
I'm working on a NavigationStack based app. Somewhere I'm using:
@Environment(\.dismiss) private var dismiss
and when trying to navigate to that view it gets stuck.
I used Self._printChanges() and discovered the environment variable dismiss is changing repeatedly. Obviously I am not changing that variable explicitly. I wasn't able to reproduce this in a small project so far, but does anybody have any idea what kind of thing I could be doing that might be causing this issue?
iOS 17.0.3
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.