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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ActiveLabel
Hey Everyone, I can't see to ActiveLabel as it says there is no active module. Please help me. Thanks, Ben import UIKit import ActiveLabel protocol TweetCellDelegate: AnyObject { func handleProfileImageTapped(_ cell: TweetCell) func handleReplyTapped(_ cell: TweetCell) func handleLikeTapped(_ cell: TweetCell) } class TweetCell: UICollectionViewCell {
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242
Mar ’25
Crash on Intel during UI layout
We've got a hard to repro issue on Intel only when performing UI layout. It seems the collection view code gets into a recursive loop of doom and eventually the app crashes. This is only happening on Intel, the ARM version is fine. It seems related to this issue: https://developer.apple.com/forums/thread/732580 There an Apple Dev acknowledges that there are issues with the Intel version of the OS. Here's the simplified stack we're seeing: -[NSISEngine _coreReplaceMarker:withMarkerPlusDelta:]" -[NSISEngine constraintDidChangeSuchThatMarker:shouldBeReplacedByMarkerPlusDelta:]", -[NSISEngine tryToChangeConstraintSuchThatMarker:isReplacedByMarkerPlusDelta:undoHandler:]", -[NSLayoutConstraint _tryToChangeContainerGeometryWithUndoHandler:]", -[NSLayoutConstraint _setSymbolicConstant:constant:symbolicConstantMultiplier:]", -[NSLayoutConstraint setConstant:]", -[NSView(NSConstraintBasedLayoutInternal) _updateSimpleAutoresizingConstraintsInPlace:forAutoresizingMask:]", NSViewUpdateConstraintsForFrameChange -[NSView setFrameSize:]", -[NSView setFrame:]", -[NSClipView _updateOverhangSubviewsIfNeeded]", -[NSClipView _reflectDocumentViewFrameChange]", -[NSView _postFrameChangeNotification]"," -[NSView setFrameSize:]", -[NSCollectionView setFrameSize:]", -[NSView setFrame:]", NSViewActuallyUpdateFrameFromLayoutEngine", -[NSView resizeSubviewsWithOldSize:]", -[NSView setFrameSize:]", -[NSClipView setFrameSize:]", -[NSView setFrame:]", -[NSScrollView _setContentViewFrame:]", -[NSScrollView tile]", -[NSScrollView _tileWithoutRecursing]", -[NSScrollView reflectScrolledClipView:]", -[NSClipView _reflectDocumentViewFrameChange]_block_invoke", -[NSClipView _reflectDocumentViewFrameChange]", -[NSView _postFrameChangeNotification]", -[NSView setFrameSize:]", -[NSCollectionView setFrameSize:]", -[NSView setFrame:]", -[NSCollectionView _resizeToFitContentAndClipView]", -[_NSCollectionViewCore setContentSize:]", -[_NSCollectionViewCore _updateVisibleCellsNow:]" -[_NSCollectionViewCore _updateVisibleCellsNow:]" -[_NSCollectionViewCore _updateVisibleCellsNow:]" -[_NSCollectionViewCore _updateVisibleCellsNow:]" . . It seems to be limited to macOS 13.1 too. Hoping someone might have a clue? Thanks, Robert. Here's a link to the full stack: https://www.icloud.com/notes/076h1RXj4rvv7TzS5ICnvG6vw#NSCollectionView_crash_stack:
Topic: UI Frameworks SubTopic: AppKit
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363
Dec ’24
VideoToolbox crash in macOS
My Mac app crashes for some users inside VideoToolbox, and I'm not sure what to do with that, and how to fix it. Here are couple of examples that repeating again and again for macOS 15.* Thread 10 Crashed: 0 libsystem_pthread.dylib 0x000000018535a8e0 0x185359000 + 6368 1 VideoToolbox 0x0000000194f3e218 0x194f28000 + 90648 2 VideoToolbox 0x00000001951de384 0x194f28000 + 2843524 3 libxpc.dylib 0x000000018506f2c0 0x185060000 + 62144 4 libxpc.dylib 0x000000018506da14 0x185060000 + 55828 5 libdispatch.dylib 0x00000001851ad674 0x1851a9000 + 18036 6 libdispatch.dylib 0x00000001851c9c88 0x1851a9000 + 134280 7 libdispatch.dylib 0x00000001851b4a38 0x1851a9000 + 47672 8 libdispatch.dylib 0x00000001851ca9dc 0x1851a9000 + 137692 9 libdispatch.dylib 0x00000001851b4a38 0x1851a9000 + 47672 10 libdispatch.dylib 0x00000001851b5764 0x1851a9000 + 51044 11 libdispatch.dylib 0x00000001851bf4cc 0x1851a9000 + 91340 12 libdispatch.dylib 0x00000001851bf260 0x1851a9000 + 90720 13 libsystem_pthread.dylib 0x00000001853602e4 0x185359000 + 29412 14 libsystem_pthread.dylib 0x000000018535b0fc 0x185359000 + 8444 and Thread 10 Crashed: 0 libsystem_pthread.dylib 0x00000001981fc364 0x1981fb000 + 4964 1 VideoToolbox 0x00000001a85f9964 0x1a81e8000 + 4266340 2 VideoToolbox 0x00000001a847a840 0x1a81e8000 + 2697280 3 libxpc.dylib 0x0000000197f09830 0x197efb000 + 59440 4 libxpc.dylib 0x0000000197f0812c 0x197efb000 + 53548 5 libdispatch.dylib 0x00000001980638a4 0x198048000 + 112804 6 libdispatch.dylib 0x00000001980660e8 0x198048000 + 123112 7 libdispatch.dylib 0x00000001980521b8 0x198048000 + 41400 8 libdispatch.dylib 0x0000000198066e4c 0x198048000 + 126540 9 libdispatch.dylib 0x00000001980521b8 0x198048000 + 41400 10 libdispatch.dylib 0x0000000198052e60 0x198048000 + 44640 11 libdispatch.dylib 0x000000019805be30 0x198048000 + 81456 12 libdispatch.dylib 0x000000019805bbf0 0x198048000 + 80880 13 libsystem_pthread.dylib 0x0000000198201c0c 0x1981fb000 + 27660 14 libsystem_pthread.dylib 0x00000001981fcb80 0x1981fb000 + 7040 and this one is for macOS 14 Thread 10 Crashed: 0 VideoToolbox 0x000000018f12ac90 0x18f11d000 + 56464 1 VideoToolbox 0x000000018f130a80 0x18f11d000 + 80512 2 VideoToolbox 0x000000018f131090 0x18f11d000 + 82064 3 VideoToolbox 0x000000018f130f94 0x18f11d000 + 81812 4 Remote for Mac 0x00000001048d521c 0x1048d0000 + 21020 5 Foundation 0x000000018174796c 0x181709000 + 256364 6 Foundation 0x000000018174782c 0x181709000 + 256044 7 Foundation 0x00000001817477bc 0x181709000 + 255932 8 Foundation 0x0000000181746b64 0x181709000 + 252772 9 Foundation 0x00000001817468d4 0x181709000 + 252116 10 Foundation 0x00000001817467c4 0x181709000 + 251844 11 libdispatch.dylib 0x00000001803b0470 0x18039d000 + 78960 12 libdispatch.dylib 0x00000001803a13e8 0x18039d000 + 17384 13 libdispatch.dylib 0x00000001803a48ec 0x18039d000 + 30956 14 libdispatch.dylib 0x00000001803a3f08 0x18039d000 + 28424 15 libdispatch.dylib 0x00000001803b2ea8 0x18039d000 + 89768 16 libdispatch.dylib 0x00000001803b36b8 0x18039d000 + 91832 17 libsystem_pthread.dylib 0x000000018054dfd0 0x18054b000 + 12240 18 libsystem_pthread.dylib 0x000000018054cd28 0x18054b000 + 7464
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67
Apr ’25
SwiftUI crashes EXC_BREAKPOINT at _dispatch_semaphore_dispose
Based on crash reports for our app in production, we're seeing these SwiftUI crashes but couldn't figure out why it is there. These crashes are pretty frequent (>20 crashed per day). Would really appreciate it if anyone has any insight on why this happens. Based on the stacktrace, i can't really find anything that links back to our app (replaced with MyApp in the stacktrace). Thank you in advance! Crashed: com.apple.main-thread 0 libdispatch.dylib 0x39dcc _dispatch_semaphore_dispose.cold.1 + 40 1 libdispatch.dylib 0x4c1c _dispatch_semaphore_signal_slow + 82 2 libdispatch.dylib 0x2d30 _dispatch_dispose + 208 3 SwiftUICore 0x77f788 destroy for StoredLocationBase.Data + 64 4 libswiftCore.dylib 0x3b56fc swift_arrayDestroy + 196 5 libswiftCore.dylib 0x13a60 UnsafeMutablePointer.deinitialize(count:) + 40 6 SwiftUICore 0x95f374 AtomicBuffer.deinit + 124 7 SwiftUICore 0x95f39c AtomicBuffer.__deallocating_deinit + 16 8 libswiftCore.dylib 0x3d783c _swift_release_dealloc + 56 9 libswiftCore.dylib 0x3d8950 bool swift::RefCounts<swift::RefCountBitsT<(swift::RefCountInlinedness)1>>::doDecrementSlow<(swift::PerformDeinit)1>(swift::RefCountBitsT<(swift::RefCountInlinedness)1>, unsigned int) + 160 10 SwiftUICore 0x77e53c StoredLocation.deinit + 32 11 SwiftUICore 0x77e564 StoredLocation.__deallocating_deinit + 16 12 libswiftCore.dylib 0x3d783c _swift_release_dealloc + 56 13 libswiftCore.dylib 0x3d8950 bool swift::RefCounts<swift::RefCountBitsT<(swift::RefCountInlinedness)1>>::doDecrementSlow<(swift::PerformDeinit)1>(swift::RefCountBitsT<(swift::RefCountInlinedness)1>, unsigned int) + 160 14 MyApp 0x1673338 objectdestroyTm + 6922196 15 libswiftCore.dylib 0x3d783c _swift_release_dealloc + 56 16 libswiftCore.dylib 0x3d8950 bool swift::RefCounts<swift::RefCountBitsT<(swift::RefCountInlinedness)1>>::doDecrementSlow<(swift::PerformDeinit)1>(swift::RefCountBitsT<(swift::RefCountInlinedness)1>, unsigned int) + 160 17 SwiftUICore 0x650290 _AppearanceActionModifier.MergedBox.__deallocating_deinit + 32 18 libswiftCore.dylib 0x3d783c _swift_release_dealloc + 56 19 libswiftCore.dylib 0x3d8950 bool swift::RefCounts<swift::RefCountBitsT<(swift::RefCountInlinedness)1>>::doDecrementSlow<(swift::PerformDeinit)1>(swift::RefCountBitsT<(swift::RefCountInlinedness)1>, unsigned int) + 160 20 SwiftUICore 0x651b44 closure #1 in _AppearanceActionModifier.MergedBox.update()partial apply + 28 21 libswiftCore.dylib 0x3d783c _swift_release_dealloc + 56 22 libswiftCore.dylib 0x3d8950 bool swift::RefCounts<swift::RefCountBitsT<(swift::RefCountInlinedness)1>>::doDecrementSlow<(swift::PerformDeinit)1>(swift::RefCountBitsT<(swift::RefCountInlinedness)1>, unsigned int) + 160 23 libswiftCore.dylib 0x3b56fc swift_arrayDestroy + 196 24 libswiftCore.dylib 0xa2a54 _ContiguousArrayStorage.__deallocating_deinit + 96 25 libswiftCore.dylib 0x3d783c _swift_release_dealloc + 56 26 libswiftCore.dylib 0x3d8950 bool swift::RefCounts<swift::RefCountBitsT<(swift::RefCountInlinedness)1>>::doDecrementSlow<(swift::PerformDeinit)1>(swift::RefCountBitsT<(swift::RefCountInlinedness)1>, unsigned int) + 160 27 SwiftUICore 0x4a6c4c type metadata accessor for _ContiguousArrayStorage<CVarArg> + 120 28 libswiftCore.dylib 0x3d783c _swift_release_dealloc + 56 29 libswiftCore.dylib 0x3d8950 bool swift::RefCounts<swift::RefCountBitsT<(swift::RefCountInlinedness)1>>::doDecrementSlow<(swift::PerformDeinit)1>(swift::RefCountBitsT<(swift::RefCountInlinedness)1>, unsigned int) + 160 30 SwiftUICore 0x4a5d88 static Update.dispatchActions() + 1332 31 SwiftUICore 0xa0db28 closure #2 in closure #1 in ViewRendererHost.render(interval:updateDisplayList:targetTimestamp:) + 132 32 SwiftUICore 0xa0d928 closure #1 in ViewRendererHost.render(interval:updateDisplayList:targetTimestamp:) + 708 33 SwiftUICore 0xa0b0d4 ViewRendererHost.render(interval:updateDisplayList:targetTimestamp:) + 556 34 SwiftUI 0x8f1634 UIHostingViewBase.renderForPreferences(updateDisplayList:) + 168 35 SwiftUI 0x8f495c closure #1 in UIHostingViewBase.requestImmediateUpdate() + 72 36 SwiftUI 0xcc700 thunk for @escaping @callee_guaranteed () -> () + 36 37 libdispatch.dylib 0x2370 _dispatch_call_block_and_release + 32 38 libdispatch.dylib 0x40d0 _dispatch_client_callout + 20 39 libdispatch.dylib 0x129e0 _dispatch_main_queue_drain + 980 40 libdispatch.dylib 0x125fc _dispatch_main_queue_callback_4CF + 44 41 CoreFoundation 0x56204 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 16 42 CoreFoundation 0x53440 __CFRunLoopRun + 1996 43 CoreFoundation 0x52830 CFRunLoopRunSpecific + 588 44 GraphicsServices 0x11c4 GSEventRunModal + 164 45 UIKitCore 0x3d2eb0 -[UIApplication _run] + 816 46 UIKitCore 0x4815b4 UIApplicationMain + 340 47 SwiftUI 0x101f98 closure #1 in KitRendererCommon(_:) + 168 48 SwiftUI 0xe2664 runApp<A>(_:) + 100 49 SwiftUI 0xe5490 static App.main() + 180 50 MyApp 0x8a7828 main + 4340250664 (MyApp.swift:4340250664) 51 ??? 0x1ba496ec8 (Missing)
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530
Jan ’25
How to override NSWindow in a pure SwiftUI Application
So I am looking to use a custom NSWindow application (so I can implement some enhanced resizing/dragging behavior which is only possible overriding NSWindow). The problem is my whole application is currently SwiftUI-based (see the project here: https://github.com/msdrigg/Roam/blob/50a2a641aa5f2fccb4382e14dbb410c1679d8b0c/Roam/RoamApp.swift). I know there is a way to make this work by dropping my @main SwiftUI app and replacing it with a SwiftUI root view hosted in a standard AppKit root app, but that feels like I'm going backwards. Is there another way to get access (and override) the root NSWindow for a SwiftUI app?
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280
Mar ’25
Difficulty Localizing App Display Name Based on Region in iOS.
I have an application named "XY" that has been launched in several countries. Now, I intend to launch it in Turkey, but we are facing legal issues preventing us from using "XY" as the app's display name. Following the documentation, I localized the app's display name to "ZX" for both Turkish and English (Turkey). However, when users change their device settings, they do not see an option for English (Turkey) language selection. I assumed that for Turkish users, English (Turkey) would be the default language, but this is not the case. Could someone please assist me in resolving this issue? I've investigated options for localizing the display name based on region, but it seems that this functionality isn't feasible on iOS. In contrast, it's relatively straightforward to achieve on Android platforms.
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405
Mar ’25
How does UIScene know whether it has the main key window and when it changes on iPad's multi-scene?
Hi. I know to know which window gets hardware keyboard events (such as shortcut key) currently on iPad. Until iPadOS 15.0, UIApplication.shared.keyWindow, which was deprecated on iPadOS 13.0 and didBecomeKeyNotification/didResignKeyNotification. But after iPadOS 15.0, a keyWindow is managed by UIScene, not by UIApplication. Each scene of my app always has just one window. For my purpose, checking deprecated UIApplication.shared.keyWindow is still effective but didBecomeKeyNotification and didResignKeyNotification don't work because they are fired when a change happens only inside the scene. So my questions are, What is the new alternative of UIApplication.shared.keyWindow? I know a wrong hack like UIApplication.shared.connectedScenes.compactMap { $0 as? UIWindowScene }.first?.windows.filter { $0.isKeyWindow }.first does not work since the order of connectedScenes is not related with getting hardware keyboard events. What are the new alternatives of didBecomeKeyNotification/didResignKeyNotification which work on inter-scene? The second question is more crucial. Because about the first question, I can still use deprecated UIApplication.shared.keyWindow. Thanks.
Topic: UI Frameworks SubTopic: General Tags:
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236
Feb ’25
App Crashes on Paper Selection After Background Printer Connection
Description: When initiating the print flow via UIPrintInteractionController, and no printer is initially connected, iOS displays all possible paper sizes in the paper selection UI. However, if a printer connects in the background after this view is shown, the list of paper sizes does not automatically refresh to reflect only the options supported by the connected printer. If the user selects an incompatible paper size (one not supported by the printer that has just connected), the app crashes due to an invalid configuration. Steps to Reproduce: Launch the app and navigate to the print functionality. Tap the Print button to invoke UIPrintInteractionController. At this point, no printer is yet connected. iOS displays all available paper sizes. While the paper selection UI is visible, the AirPrint-compatible printer connects in the background. Without dismissing the controller, the user selects a paper size (e.g., one that is not supported by the printer). The app crashes. Expected Result: App should not crash Once the printer becomes available (connected in the background), the paper size options should refresh automatically. The list should be filtered to only include sizes that are compatible with the connected printer. This prevents the user from selecting an invalid option, avoiding crashes. Actual Result: App crashes The paper size list remains unfiltered. The user can still select unsupported paper sizes. Selecting an incompatible option causes the app to crash, due to a mismatch between UI selection and printer capability.
Topic: UI Frameworks SubTopic: UIKit
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74
Apr ’25
searchable isPresented set too late in a sheet
I have a popover/sheet in iOS which allows users to search and add items to a list. When the sheet is shown, the search should always be active. I am using searchable on a NavigationStack inside the sheet. I am using the isPresented parameter to activate search. My issue is with the animation of the search activation. Even if I use... isPresented: .constant(true) ...the search isn't activated until the sheet has completed it's entrance animation, resulting in two stages of animation. I can't add a video here, but the two images below show the steps I am seeing. First a slide up animation, with the search in the navigation drawer, then a second animation, once the sheet is fully in place, as the search becomes active. Is it possible to merge these two animations, so search is in place when the sheet animates up?
Topic: UI Frameworks SubTopic: SwiftUI
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40
Apr ’25
Putting buttons over SwiftUI map view
Has anyone gotten custom buttons to work on top of tvOS Map()? I've tried many variations of FocusState focusSection .defaultFocus() and as soon as the map appears at startup the buttons never get focus again. They are on a ZStack over the map. I could post code but truthfully nothing works for me. I'm wondering if anyone has successfully put focusable buttons on top of the map view.
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225
Mar ’25
Moving SceneDelegate to a different target
I have a SwiftUI project which has the following hierarchy: IOSSceneDelegate (App target) - depends on EntryPoint and Presentation static libs. Presentation (Static library) - Depends on EntryPoint static lib. Contains UI related logic and updates the UI after querying the data layer. EntryPoint (Static library) - Contains the entry point, AppDelegate (for its lifecycle aspects) etc. I've only listed the relevant targets here. SceneDelegate was initially present in EntryPoint library, because the AppDelegate references it when a scene is created. public func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -&gt; UISceneConfiguration { // Set the SceneDelegate dynamically let sceneConfig: UISceneConfiguration = UISceneConfiguration(name: "mainWindow", sessionRole: connectingSceneSession.role) sceneConfig.delegateClass = SceneDelegate.self return sceneConfig } The intent is to move the SceneDelegate to the Presentation library. When moved, the EntryPoint library fails to compile because it's referencing the SceneDelegate (as shown above). To remove this reference, I tried to set up the SceneDelegate in the old way - In the info.plist file, mention a SceneConfiguration and set the SceneDelegate in Presentation. // In the Info.plist file &lt;key&gt;UIApplicationSceneManifest&lt;/key&gt; &lt;dict&gt; &lt;key&gt;UIApplicationSupportsMultipleScenes&lt;/key&gt; &lt;true/&gt; &lt;key&gt;UISceneConfigurations&lt;/key&gt; &lt;dict&gt; &lt;key&gt;UIWindowSceneSessionRoleApplication&lt;/key&gt; &lt;array&gt; &lt;dict&gt; &lt;key&gt;UISceneConfigurationName&lt;/key&gt; &lt;string&gt;Default Configuration&lt;/string&gt; &lt;key&gt;UISceneDelegateClassName&lt;/key&gt; &lt;string&gt;Presentation.SceneDelegate&lt;/string&gt; &lt;/dict&gt; &lt;/array&gt; &lt;/dict&gt; &lt;/dict&gt; // In the AppDelegate public func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -&gt; UISceneConfiguration { // Refer to a static UISceneconfiguration listed in the info.plist file return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role) } As shown above, the Presentation.SceneDelegate is referred in the Info.plist file and the reference is removed from the AppDelegate (in EntryPoint library). The app target compiles, but when I run it, the SceneDelegate is not invoked. None of the methods from the SceneDelegate (scene(_:willConnectTo:options:), sceneDidDisconnect(_:), sceneDidEnterBackground(_:) etc.) are invoked. I only get the AppDelegate logs. It seems like the Configuration is ignored because it was incorrect. Any thoughts? Is it possible to move the SceneDelegate in this situation?
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400
Feb ’25
Playground SwiftUI on iPad wont save .png image using fileExporter.
The SwiftUI Playground code below demonstrates that a .jpeg image can be read and written to the iOS file system. While, a.png image can only be read; the writing request appears to be ignored. Can anyone please tell me how to code to save a .png image using SwiftUI to the iOS file system. Code: import SwiftUI import UniformTypeIdentifiers /* (Copied from Playground 'Help' menu popup.) UIImage Summary An object that manages image data in your app. You use image objects to represent image data of all kinds, and the UIImage class is capable of managing data for all image formats supported by the underlying platform. Image objects are immutable, so you always create them from existing image data, such as an image file on disk or programmatically created image data. An image object may contain a single image or a sequence of images for use in an animation. You can use image objects in several different ways: Assign an image to a UIImageView object to display the image in your interface. Use an image to customize system controls such as buttons, sliders, and segmented controls. Draw an image directly into a view or other graphics context. Pass an image to other APIs that might require image data. Although image objects support all platform-native image formats, it’s recommended that you use PNG or JPEG files for most images in your app. Image objects are optimized for reading and displaying both formats, and those formats offer better performance than most other image formats. Because the PNG format is lossless, it’s especially recommended for the images you use in your app’s interface. Declaration class UIImage : NSObject UIImage Class Reference */ @main struct MyApp: App { var body: some Scene { WindowGroup { ContentView() } } } struct ImageFileDoc: FileDocument { static var readableContentTypes = [UTType.jpeg, UTType.png] static var writableContentTypes = [UTType.jpeg, UTType.png] var someUIImage: UIImage = UIImage() init(initialImage: UIImage = UIImage()) { self.someUIImage = initialImage } init(configuration: ReadConfiguration) throws { guard let data = configuration.file.regularFileContents, let some = UIImage(data: data) else { throw CocoaError(.fileReadCorruptFile) } self.someUIImage = some } func fileWrapper(configuration: WriteConfiguration) throws -> FileWrapper { switch configuration.contentType { case UTType.png: if let data = self.someUIImage.pngData() { return .init(regularFileWithContents: data) } case UTType.jpeg: if let data = self.someUIImage.jpegData(compressionQuality: 1.0) { return .init(regularFileWithContents: data) } default: break } throw CocoaError(.fileWriteUnknown) } } struct ContentView: View { @State private var showingExporterPNG = false @State private var showingExporterJPG = false @State private var showingImporter = false @State var message = "Hello, World!" @State var document: ImageFileDoc = ImageFileDoc() @State var documentExtension = "" var body: some View { VStack { Image(systemName: "globe") .imageScale(.large) .foregroundColor(.accentColor) Text(message) Button("export") { if documentExtension == "png" { message += ", showingExporterPNG is true." showingExporterPNG = true } if documentExtension == "jpeg" { message += ", showingExporterJPG is true." showingExporterJPG = true } } .padding(20) .border(.white, width: 2.0) .disabled(documentExtension == "") Button("import") { showingImporter = true } .padding(20) .border(.white, width: 2.0) Image(uiImage: document.someUIImage) .resizable() .padding() .frame(width: 300, height: 300) } // exporter .png .fileExporter(isPresented: $showingExporterPNG, document: document, contentType: UTType.png) { result in switch result { case .success(let url): message += ", .\(documentExtension) Saved to \(url.lastPathComponent)" case .failure(let error): message += ", Some error saving file: " + error.localizedDescription } } // exporter .jpeg .fileExporter(isPresented: $showingExporterJPG, document: document, contentType: UTType.jpeg) { result in switch result { case .success(let url): message += ", .\(documentExtension) Saved to \(url.lastPathComponent)" case .failure(let error): message += ", Some error saving file: " + error.localizedDescription } } // importer .fileImporter(isPresented: $showingImporter, allowedContentTypes: [.png, .jpeg]) { result in switch result { case .failure(let error): message += ", Some error reading file: " + error.localizedDescription case .success(let url): let gotAccess = url.startAccessingSecurityScopedResource() if !gotAccess { message += ", Unable to Access \(url.lastPathComponent)" return } documentExtension = url.pathExtension guard let fileContents = try? Data(contentsOf: url) else { message += ",\n\nUnable to read file: \(url.lastPathComponent)\n\n" url.stopAccessingSecurityScopedResource() return } url.stopAccessingSecurityScopedResource() message += ", Read file: \(url.lastPathComponent)" message += ", path extension is '\(documentExtension)'." if let uiImage = UIImage(data: fileContents) { self.document.someUIImage = uiImage }else{ message += ", File Content is not an Image." } } } } }
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336
Feb ’25
Magnification Gesture conflicts with UIPageViewController scroll gesture
The Problem I am trying to implement a pinch-to-zoom feature on images within a UIPageViewController. However, often times when trying to pinch to zoom, the magnification gesture gets overridden by the scrolling gesture built into the UIPageViewController. I'm not sure how to get around this. The Apple Photos app seems to allow pinch to zoom on photos inside a full-page scrolling view without any issue, so I believe it should be possible. Versions: iOS 17.2.1 - iOS 18.2.1, Swift (SwiftUI), Xcode 15.1 Steps to Reproduce Run this sample Xcode project on a physical device: https://drive.google.com/file/d/1tB1QyY6QPEp-WLzdHxgDdkM45xCAELLr/view?usp=share_link Try pinching to zoom on the image. After a few goes at it, you'll likely find that one time it will scroll instead of pinching to zoom. It might take up to a dozen pinches to experience this issue. What I've Tried Making the magnification gesture a high priority gesture. Having only one page in the paging view controller. Subclassing UIScrollView and conforming to the UIGestureRecognizerDelegate in that subclass, as explained here: https://stackoverflow.com/a/51070947/12218938 Using the iOS 17 ScrollView instead. Unfortunately it has the same issue but even worse! It's possible that since this is a native SwiftUI view, people might have solutions to this, but from a brief search I couldn't find any. If you set the data source to nil (which indicates that there are no other pages for the paging view controller to scroll to), it does work, but it's not a workable solution since the time you'd want to set the data source to nil is when the user pinches the screen, but you can't know when the user pinches the screen if the gesture doesn't work! Other Ideas/Workarounds We could have some "zoom" mode that temporarily cancels the ability to scroll while zooming. But this seems like not too nice/intuitive of a solution. If there is no paging view that Apple provides which could be made compatible with a pinch-to-zoom gesture, it's possible we would have to make a completely custom paging view. But that would be a lot of work I presume, so it's probably not something we would have time for right now.
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442
Jan ’25
LaunchScreen Storyboard layout issue on iPhone 16 Pro Max
I currently face an Issue where the SafeAreaInsets on the iPhone 16 Pro Max is not respected on LaunchScreens. Lets say you have an ImageView whose leading, trailing and top are equal to the SafeAreaLayoutGuides leading, trailing and top. Then you have a SwiftUI View such as the following representing the same layout in code: GeometryReader { reader in ZStack { VStack(spacing: 0) { Spacer(minLength: 0) .frame(height: reader.safeAreaInsets.top) Image(decorative: "splashLogo") Spacer(minLength: 0) } .frame(width: reader.size.width) } .edgesIgnoringSafeArea(.all) } Both the storyboard preview as well as the SwiftUI preview show identical results in Xcode. Launching the app on the device however briefly shows the image below the Dynamic Island cutout until the app is launched to the SwiftUI view. Noticed this only happening on the iPhone 16 Pro Max.
Topic: UI Frameworks SubTopic: General
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1
358
Dec ’24
NSTextField Delegates Not Triggering After Refactoring NSView to NSViewController in macOS App
I'm developing a macOS application and facing an issue with NSTextField delegates after refactoring my code. Here's the situation: I have an NSWindowController. Inside the NSWindowController, there's a container NSView named containerView. On top of containerView, I added a custom NSView subclass named MyDetailsView. MyDetailsView has two NSTextField instances, and their delegates are properly set. The delegate methods like controlTextDidChange(_:) were getting called as expected. Due to some additional requirements, I refactored MyDetailsView into MyDetailsViewController, a subclass of NSViewController. I created a corresponding .xib file for MyDetailsViewController. Updated the code to load and add MyDetailsViewController's view (view property) to containerView. Verified that the NSTextField delegates are still being set, and the fields are displayed correctly in the UI. However, after this refactor, the NSTextField delegate methods (e.g., controlTextDidChange(_:)) are no longer being triggered. **What I've Tried: ** Verified that the delegates for the NSTextField instances are correctly set after the refactor. Ensured that the MyDetailsViewController's view is added to containerView. Question: What could be causing the NSTextField delegate methods to stop working after refactoring from NSView to NSViewController? @IBOutlet weak var customeView: NSView! var myDetailsViewController: MyDetailsViewController! var myDetailsView: MyDetailsView! var isViewController: Bool = true override func windowDidLoad() { super.windowDidLoad() if isViewController { myDetailsViewController = MyDetailsViewController(nibName: "MyDetailsViewController", bundle: nil) self.customeView.addSubview(myDetailsViewController.view) } else { myDetailsView = MyDetailsView.createFromNib() self.customeView.addSubview(myDetailsView!) } } override func showWindow(_ sender: Any?) { super.showWindow(nil) window?.makeKeyAndOrderFront(nil) } override var windowNibName: NSNib.Name? { return NSNib.Name("MyWindowController") }} class MyDetailsViewController: NSViewController { @IBOutlet weak var textField: NSTextField! override func viewDidLoad() { super.viewDidLoad() // Do view setup here. } } extension MyDetailsViewController: NSTextDelegate { func controlTextDidChange(_ obj: Notification) { guard let textField = obj.object as? NSTextField else { return } print("The value is ----> (MyDetailsViewController) \(textField.stringValue)") } } TextField delegate is set in XIB.
Topic: UI Frameworks SubTopic: AppKit Tags:
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Dec ’24