Provide views, controls, and layout structures for declaring your app's user interface using SwiftUI.

Posts under SwiftUI tag

200 Posts

Post

Replies

Boosts

Views

Activity

virtual game controller + SwiftUI warning
Hi, I've just moved my SpriteKit-based game from UIView to SwiftUI + SpriteView and I'm getting this mesage Adding 'GCControllerView' 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. Here's how I'm doing this struct ContentView: View { @State var alreadyStarted = false let initialScene = GKScene(fileNamed: "StartScene")!.rootNode as! SKScene var body: some View { ZStack { SpriteView(scene: initialScene, transition: .crossFade(withDuration: 1), isPaused: false , preferredFramesPerSecond: 60) .edgesIgnoringSafeArea(.all) .onAppear { if !self.alreadyStarted { self.alreadyStarted.toggle() initialScene.scaleMode = .aspectFit } } VirtualControllerView() .onAppear { let virtualController = BTTSUtilities.shared.makeVirtualController() BTTSSharedData.shared.virtualGameController = virtualController BTTSSharedData.shared.virtualGameController?.connect() } .onDisappear { BTTSSharedData.shared.virtualGameController?.disconnect() } } } } struct VirtualControllerView: UIViewRepresentable { func makeUIView(context: Context) -> UIView { let result = PassthroughView() return result } func updateUIView(_ uiView: UIView, context: Context) { } } class PassthroughView: UIView { override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? { for subview in subviews.reversed() { let convertedPoint = convert(point, to: subview) if let hitView = subview.hitTest(convertedPoint, with: event) { return hitView } } return nil } }
1
0
323
Sep ’25
SwiftUI Picker layout under MacOS26
Prior to MacOS 26, Multiple Pickers could be laid out with a uniform width. For example: struct LayoutExample: View { let fruits = ["apple", "banana", "orange", "kiwi"] let veg = ["carrot", "cauliflower", "peas", "Floccinaucinihilipilification Cucurbitaceae"] @State private var selectedFruit: String = "kiwi" @State private var selectedVeg: String = "carrot" var body: some View { VStack(alignment: .leading) { Picker(selection: $selectedFruit) { ForEach(fruits, id: \.self, content: Text.init) } label: { Text("Fruity choice") .frame(width: 150, alignment: .trailing) } .frame(width: 300) Picker(selection: $selectedVeg) { ForEach(veg, id: \.self, content: Text.init) } label: { Text("Veg") .frame(width: 150, alignment: .trailing) } .frame(width: 300) } } } Renders like this, prior to MacOS26: But now looks like this under MacOS 26: Is there anyway to control the size of the picker selection in MacOS 26?
1
0
81
Sep ’25
iOS 26 navigationTransition .zoom issue
When I dismiss a view presented with .navigationTransition(.zoom), the source view gets a weird background (black or white depending on the appearance) for a couple of seconds, and then it disappears. Here’s a simple code example. import SwiftUI struct NavigationTransition: View { @Namespace private var namespace @State private var isSecondViewPresented = false var body: some View { NavigationStack { ZStack { DetailView(namespace: namespace) .onTapGesture { isSecondViewPresented = true } } .fullScreenCover(isPresented: $isSecondViewPresented) { SecondView() .navigationTransition(.zoom(sourceID: "world", in: namespace)) } } } } struct DetailView: View { var namespace: Namespace.ID var body: some View { ZStack { Color.blue Text("Hello World!") .foregroundStyle(.white) .matchedTransitionSource(id: "world", in: namespace) } .ignoresSafeArea() } } struct SecondView: View { var body: some View { ZStack { Color.green Image(systemName: "globe") .foregroundStyle(Color.red) } .ignoresSafeArea() } } #Preview { NavigationTransition() }
5
4
285
Sep ’25
Bug Report: SwiftUI @State Array Assignment Fails to Trigger UI Updates. Presumably when lengths of the old and new arrays are the same.
Environment: — Xcode Version: [Current version] — iOS Version: [Target iOS version] — Swift Version: 6.0.3 — Platform: iOS Summary: Direct assignment of new arrays to @State properties sometimes fails to trigger UI updates, even when the arrays contain different data. The assignment appears to succeed in code but the UI continues to display stale data. Presumably when lengths of both arrays are the same. Assigning first empty array and then the new array fixed the issue. Expected Behavior: When assigning a new array to a @State property (self.stateArray = newArray), SwiftUI should detect the change and update the UI to reflect the new data. Actual Behavior: The assignment self.stateArray = newArray executes without error, but the UI continues to display data from the previous array. Debugging shows that self._stateArray (the underlying property wrapper) retains the old data despite the assignment. Minimal Reproduction Case: struct ContentView: View { @State private var items: [String] = ["Old Item"] var body: some View { VStack { ForEach(items, id: \.self) { item in Text(item) } Button("Update Items") { // This assignment may not trigger UI update self.items = ["New Item", "Another Item"] // Workaround: Clear first, then assign // self.items = [] // self.items = ["New Item", "Another Item"] } } } } Workaround: Force the state update by clearing the array before assignment: self.items = [] // Clear first self.items = newArray // Then assign new data Additional Context: — This issue was discovered in a production app where item data loaded from cache wasn't updating the UI. — The same data loading pattern worked in one view (which is modal and doesn't reload data) but failed in another (which needs to be refreshed). — Console logs showed fresh data was loaded but UI displayed stale data. — Debugger showed self._items instead of self.items, which might suggest property wrapper issues. Impact: This causes significant user experience issues where the UI doesn't reflect the actual application state, leading to confusion and apparent data inconsistency. Request: Please investigate why direct @State array assignment sometimes fails and consider fixing the underlying cause, or at minimum document this behavior and recommended workarounds.
1
0
115
Sep ’25
Trouble with contextMenu previewing high resolution images
When using a contextMenu in SwiftUI to show a preview of a PHAsset’s full-size image via PHCachingImageManager.requestImage(), memory usage increases with each image preview interaction. The memory is not released, leading to eventual app crash due to memory exhaustion. The thumbnail loads and behaves as expected, but each call to fetch the full-size image (1000x1000) for the contextMenu preview does not release memory, even after cancelImageRequest() is called and fullSizePreviewImage is set to nil. The issue seems to stem from the contextMenu lifecycle behavior, it triggers .onAppear unexpectedly, and the full-size image is repeatedly fetched without releasing the previously loaded images. The question is, where do I request to the get the full-size image to show it in the context menu preview? STEPS TO REPRODUCE 1/ Create a SwiftUI LazyVGrid displaying many PHAsset thumbnails using PHCachingImageManager. 2/ Add a .contextMenu to each thumbnail button with: .onAppear that triggers requestImage() for a high-resolution preview. .onDisappear that calls cancelImageRequest() and sets the image @State to nil. 3/ Tap on several image previews 4/ Monitor memory usage as it increases and eventually crashes
1
0
118
Sep ’25
RC Pro Timeline Notification Not Received in Xcode
I'm having a heck of a time getting this to work. I'm trying to add an event notification at the end of a timeline animation to trigger something in code but I'm not receiving the notification from RC Pro. I've watched that Compose Interactive 3D Content video quite a few times now and have tried many different ways. RC Pro has the correct ID names on the notifications. I'm not a programmer at all. Just a lowly 3D artist. Here is my code... import SwiftUI import RealityKit import RealityKitContent extension Notification.Name { static let button1Pressed = Notification.Name("button1pressed") static let button2Pressed = Notification.Name("button2pressed") static let button3Pressed = Notification.Name("button3pressed") } struct MainButtons: View { @State private var transitionToNextSceneForButton1 = false @State private var transitionToNextSceneForButton2 = false @State private var transitionToNextSceneForButton3 = false @Environment(AppModel.self) var appModel @Environment(\.dismissWindow) var dismissWindow // Notification publishers for each button private let button1PressedReceived = NotificationCenter.default.publisher(for: .button1Pressed) private let button2PressedReceived = NotificationCenter.default.publisher(for: .button2Pressed) private let button3PressedReceived = NotificationCenter.default.publisher(for: .button3Pressed) var body: some View { ZStack { RealityView { content in // Load your RC Pro scene that contains the 3D buttons. if let immersiveContentEntity = try? await Entity(named: "MainButtons", in: realityKitContentBundle) { content.add(immersiveContentEntity) } } // Optionally attach a gesture if you want to debug a generic tap: .gesture( TapGesture().targetedToAnyEntity().onEnded { value in print("3D Object tapped") _ = value.entity.applyTapForBehaviors() // Do not post a test notification here—rely on RC Pro timeline events. } ) } .onAppear { dismissWindow(id: "main") // Remove any test notification posting code. } // Listen for distinct button notifications. .onReceive(button1PressedReceived) { (output) in print("Button 1 pressed notification received") transitionToNextSceneForButton1 = true } .onReceive(button2PressedReceived.receive(on: DispatchQueue.main)) { _ in print("Button 2 pressed notification received") transitionToNextSceneForButton2 = true } .onReceive(button3PressedReceived.receive(on: DispatchQueue.main)) { _ in print("Button 3 pressed notification received") transitionToNextSceneForButton3 = true } // Present next scenes for each button as needed. For example, for button 1: .fullScreenCover(isPresented: $transitionToNextSceneForButton1) { FacilityTour() .environment(appModel) } // You can add additional fullScreenCover modifiers for button 2 and 3 transitions. } }
5
0
384
Sep ’25
tabViewBottomAccessory inline functionality missing?
Summary As presented in the SwiftUI WWDC video, the new tabViewBottomAccessory should allow for unique contents for .inline. This is what was presented as being used for the Apple Music miniplayer. However, the functionality seems to be either missing or unintuitive. As seen in the photos attached, not only does .inline functionality not seem to do anything, but the inline accessory also has misaligned elements that cannot be fixed by conditionally modifying the contents. Build Target iOS 26.0 Details This problem recurs on physical devices, simulators, and Xcode previews. Here is a view I've constructed for use as a tabViewBottomAccessory: struct FitnessToolbarAccessory: View { @Environment(\.tabViewBottomAccessoryPlacement) var placement var body: some View { if (placement == .inline) { Text("hello") } else { HStack { HStack { Image(systemName: "dumbbell.fill") VStack(alignment: .leading) { Text("Active Workout") Text("Push Day - Chest") .font(.system(size: 13)) } Spacer() Image(systemName: "pause.fill") } .padding() } } } } Here is the result, working as expected in expanded mode: And here is the result in inline mode after minimizing the tabViewBottomAccessory: The content of this inline accessory is clearly incorrect, as it was specified to contain a Text view containing "hello". Additionally, the contents seem to have some incorrect alignment. This occurs regardless of the contents of the accessory, even plain text.
2
2
205
Sep ’25
Showing space .navigationTitle leads to unexpected results.
I wanted to set navigationTitle value to space symbol on my iOS app (Swift 6, iOS 26.0) (so that navigationBar opens in large mode initially before the actual value is being fetched). In my view I used this: .navigationTitle(" ") And on device I got unexpectedly two quote symbols: Not sure if there is space in between, and the symbols look like opening and closing quote (both quotes in code I think are the same symbols) - so probably it's not part of my code is visible in UI as one might think... . Is this a bug? Or undocumented feature?
0
0
99
Sep ’25
View with FetchRequest doesnt update on change
Hello guys, this is my first post to this forum and really hope that somebody can help me here. I would highly appreciate every help! I am writing my first app with Swift UI (never used UIKit before) which I want to publish later on. This is also my first app which has CoreData implemented. For example I use the following entities: Family, Person 1 Persons can have 1 Family 1 Family can have many Persons My App is structured as the following: ContentView: Contains a TabView with 2 other views in it. A Settings View and a View with a LazyVGrid. LazyVGrid View: This View shows a GridItem for every Family. I get the Families with the following Fetchrequest: @Environment(\.managedObjectContext) private var viewContext // These are the Families from the FetchRequest @FetchRequest(entity: Family.entity(), sortDescriptors: [NSSortDescriptor(keyPath: \Family.created, ascending: false)] ) var families: FetchedResults<Family> Every GridItem is linking to a "FamilyDetailView" via NavigationLink. So i pass the family as the following: NavigationLink(destination: FamilyDetailView(family: family).environment(\.managedObjectContext, self.viewContext), label: {Text("Family Name") In the FamilyDetailView i get the Family with a property wrapper: @State var family : Family In this FamilyDetailView is the problem i have. Here I also have a LazyVGrid, which shows 1 NavigationLink for every Person in the Family in a GridItem . In this GridItem I also show for example the "name" of the Person. When tapping the NavigationLink i get to the last View, the PersonDetailView. This View gets the Person which is also an entity which has a relationship to the Family Entity. I pass it as the follow: NavigationLink( destination: PersonDetailView(person: person), label: {Text("Person")}) In the PersonDetailView I now change the name of the person and save the changed to CoreData. The change is saved without a problem, the problem is that when I go back, using the topleading back button from the NavigationView, the Views are not updated. I have to restart the App to see the changes.. I know that the Problem has to be with passing the Data, but I cant figuring out what I did wrong. I really appreciate everyone trying to help me! Thank you very very much!!
1
1
759
Sep ’25
joblinkapp's registerview problem
我正在使用 Core Data 开发一个 SwiftUI 项目。我的数据模型中有一个名为 AppleUser 的实体,具有以下属性:id (UUID)、name (String)、email (String)、password (String) 和 createdAt (Date)。所有属性都是非可选的。 我使用 Xcode 的自动生成创建了相应的 Core Data 类文件(AppleUser+CoreDataClass.swift 和 AppleUser+CoreDataProperties.swift)。我还有一个 PersistenceController,它使用模型名称 JobLinkModel 初始化 NSPersistentContainer。 当我尝试使用以下方法保存新的 AppleUser 对象时: 让用户 = AppleUser(上下文:viewContext) user.id = UUID() user.name = “用户 1” user.email = “...” user.password = “密码 1” user.createdAt = Date()【电子邮件格式正确,但已替换为“...”出于隐私原因】 尝试?viewContext.save() 我在控制台中收到以下错误:核心数据保存失败:Foundation._GenericObjCError.nilError, [:] 用户快照: [“id”: ..., “name”: “User1”, “email”: “...”, “password”: “...”, “createdAt”: ...] 所有字段都有有效值,核心数据模型似乎正确。我还尝试过: • 检查 NSPersistentContainer(name:) 中的模型名称是否与 .xcdatamodeld 文件 (JobLinkModel) 匹配 • 确保正确设置 AppleUser 实体类、模块和 Codegen(类定义、当前产品模块) • 删除重复或旧的 AppleUser 类文件 • 清理 Xcode 构建文件夹并从模拟器中删除应用程序 • 对上下文使用 @Environment(.managedObjectContext) 尽管如此,在保存新的 AppleUser 对象时,我仍然会收到 _GenericObjCError.nilError。 我想了解: 为什么即使所有字段都不是零且正确分配,核心数据也无法保存? 这可能是由于一些残留的旧类文件引起的,还是我缺少设置中的其他内容? 我应该采取哪些步骤来确保 Core Data 正确识别 AppleUser 实体并允许保存? 任何帮助或指导将不胜感激。
2
0
118
Sep ’25
Unable to Override "Link with Highlight" in WKWebView
Hello everyone, I'm working on an app that uses WKWebView. My app uses a custom menu and we disable the default menu by overriding with: WKWebAction.canPerformAction() However, with the new iOS 18.2 release, I am no longer able to override the "Copy Link with Highlight" option that pops up when highlighting a selection as can be seen from the screenshot: Has anyone found a work around/bypass for this? Environment iOS Version: iOS 18.2 Device: iPhone 13 Pro App platform: iOS Xcode version: 16.1 MacOS: 14.5
5
5
1.2k
Sep ’25
Using Glass in SwiftUI Crashes with Missing Weak Symbol
My Xcode project fails to run with the following crash log any time I use a new SwiftUI symbol such as ConcentricRectangle or .glassEffect. I've tried using the legacy linker to no avail. It compiles perfectly fine, and I've tried targeting just macOS 26 also to no avail. This is a macOS project that's compiled just fine for years and compiles and runs on macOS going back to 13.0. Failed to look up symbolic reference at 0x118e743cd - offset 1916987 - symbol symbolic _____y_____y_____y_____yAAyAAy_____y__________G_____G_____yAFGGSg_ACyAAy_____y_____SSG_____y_____SgGG______tGSgACyAAyAAy_____ATG_____G_AVtGSgtGGAQySbGG______Qo_ 7SwiftUI4ViewPAAE11glassEffect_2inQrAA5GlassV_qd__tAA5ShapeRd__lFQO AA15ModifiedContentV AA6VStackV AA05TupleC0V AA01_hC0V AA9RectangleV AA5ColorV AA12_FrameLayoutV AA24_BackgroundStyleModifierV AA6IDViewV 8[ ]012EditorTabBarC0V AA022_EnvironmentKeyWritingS0V A_0W0C AA7DividerV A_0w4JumpyC0V AA08_PaddingP0V AA07DefaultgeH0V in /Users/[ ]/Library/Developer/Xcode/DerivedData/[ ]-grfjhgtlsyiobueapymobkzvfytq/Build/Products/Debug/[ ]/Contents/MacOS/[ ].debug.dylib - pointer at 0x119048408 is likely a reference to a missing weak symbol Example crashing code: import SwiftUI struct MyView: View { var body: some View { if #available(macOS 26.0, *) { Text("what the heck man").glassEffect() } } }
5
0
300
Sep ’25
iOS26: onDrag of SwiftUI won't be called in specific cases.
There is no issue with triggering onDrag when long-pressing for the first time. However, if the user releases their finger and the DropDelegate determines this is not a valid drop operation, it will not trigger a view update. In this case, when the user long-presses the same view again, the onDrag method will not be triggered even though the floating Preview view is already displayed under the finger. The problem will not recur if the DropDelegate updates the view (such as swapping the positions of views). The same code works without issues on iOS 18. The problem can be reproduced with simple code like the following: struct ContentView: View { var body: some View { Rectangle() .fill(.blue) .onDrag { print("OnDrag") return NSItemProvider() } } } The "OnDrag" log will only be output once.
0
0
48
Sep ’25
SwiftUI 26: How to change new toggles background color?
The .tint modifier doesn't seem to change the background color on the redesigned macOS 26 toggles. For example, using: Toggle("", isOn: isOn) .toggleStyle(.switch) .tint(.cyan) .scaleEffect(0.8) .opacity(isEnabled ? 1.0 : 0.4) the toggles use the system accent color instead of cyan. Has SwiftUI introduced a new modifier for that? I couldn't find anything in the June 2025 changes.
0
0
168
Sep ’25
Document title/proxy shifts left when adding an empty SwiftUI/AppKit toolbar - how to keep it centered?
I’m building a document-based macOS app using SwiftUI with an AppKit NSDocument. By default, when the window has no toolbar, the document title and proxy icon (with the edited state dot and standard saving controls) appear nicely centered in the title bar. However, as soon as I attach a toolbar - even an empty one - the document proxy moves to the leading edge of the title bar. Is there a way to keep the document proxy/title centered in a document-based SwiftUI app while also using a toolbar? Or is the left-alignment now the only supported behavior when a toolbar is present? Thanks in advance for any guidance.
2
0
115
Sep ’25
Issue keeping scroll position in SwiftUI
Hey there, Link to the sample project: https://github.com/dev-loic/AppleSampleScrolling Context We are working on creating a feed of posts in SwiftUI. So far, we have successfully implemented a classic feed that opens from the top, with bottom pagination — a standard use case. Our goal, however, is to allow the feed to open from any post, not just the first one. For example, we would like to open the feed directly at the 3rd post and then trigger a network call to load elements both above and below it. Our main focus here is on preserving the scroll position while opening the screen and waiting for the network call to complete. To illustrate the issue, I created a sample project (attached) with two screens: MainView, which contains buttons to open the feed in different states. ScrollingView, which initially shows a single element, simulates a 3-second network call, and then populates with new data depending on which button was tapped. I am currently using Xcode 26 beta 6, but I can also reproduce this issue on Xcode 16.3. Tests on sample project I click on a button and just wait the 3 seconds for the call. In this scenario, I expect that the “focused item” stays at the exact same place on the screen. I also expect to see items below and above being added. Simulator iPhone 16 / iOS 18.4 with itemsHeight = 100 position = 0, 1, 2, 3 ⇒ works as expected position = 4, 5, 6, 7, 8, 9 ⇒ scroll is reset to the top and we loose the focused item Simulator iPhone 16 / iOS 18.4 with itemsHeight = 500 position = 0, 1, 2, 3, 4 ⇒ works as expected position = 5, 6, 7 ⇒ I have a glitch (the focused element moves on the screen) but the focused element is still visible position = 8, 9 ⇒ scroll is reset to the top and we loose the focused item Simulator iPhone 16 / iOS 26 with itemsHeight = 100 or 500 position = 0, 1, 2, 3, 4 ⇒ works as expected position = 5, 6, 7, 8, 9 ⇒ I have a glitch (the focused element moves on the screen) but the focused element is still visible Device iPhone 15 / iOS 26 with itemsHeight = 100 position = 0, 1, 2, 3, 4 ⇒ works as expected position = 5, 6, 7, 8, 9 ⇒ I have a glitch (the focused element moves on the screen) but the focused element is still visible Device iPhone 15 / iOS 26 with itemsHeight = 500 position = 0, 1, 2, 3 ⇒ works as expected position = 4, 5, 6, 7, 8, 9 ⇒ I have a glitch (the focused element moves on the screen) but the focused element is still visible Not any user interaction Moreover, in this scenario, the user does not interact with the screen during the simulated network call. Regardless of the situation, if the ScrollView is in motion, its position always resets to the top. This behavior prevents us from implementing automatic pagination when scrolling upward, which is ultimately our goal. My conclusion so far As far as I know it seems not possible to have both keeping scroll possible and upward automatic pagination using a SwiftUI LazyVStack inside a ScrollView. This appears to be standard behavior in messaging apps or other feed-based apps, and I’m wondering if I might be missing something. Thank you in advance for any guidance you can provide on this topic. Cheers
2
0
166
Sep ’25
ScrollView breaks with LazyVGrid and Searchable on iOS 26 (only on older devices)
When using LazyVGrid within a ScrollView with the .searchable modifier, scrolling is impossible on iPhone 15 (I’m assuming other older devices are affected too). This behavior does not occur on iPhone 16 and newer. This also only happens, when the search bar is placed at the top, for example if the ScrollView is within a TabView. Here's a short screen recording of the issue: And this is a minimal example causing the issue: import SwiftUI struct ContentView: View { var body: some View { TabView { Tab("Text", systemImage: "gear") { ExampleTab() } } } } struct ExampleTab: View { @State private var searchText: String = "" var body: some View { NavigationStack { ScrollView { LazyVGrid( columns: [GridItem( .adaptive(minimum: 120) )], spacing: 20 ) { ForEach(1..<100) { index in Text("Test \(index)") } } } .searchable(text: self.$searchText) } } }
1
0
80
Sep ’25
Inaccessible background of the system keyboard in iOS 26 (liquid glass)
When preparing the app for the new iOS 26, I came across an unpleasant design decision. Specifically, in the new design, the keyboard has rounded corners, under which the system background is visible. And here we have only two options, a light/dark background, which breaks all keyboard calls in the application. Can you tell me if there is any way around this problem?
0
0
90
Sep ’25