Error Code: error build: Command CompileSwift failed with a nonzero exit code My Code: .backgroundTask(.appRefresh("checkValidity")) { //   scheduleAppRefresh() //  checkRecords() }

Description In Live Activities, we saw many beautiful animations that powered by .numericText() like Text(time, style: .timer), or even Text with .contentTransition(.numericText()) applied. But it seems like in normal SwiftUI View, these beautiful animations are gone. Instead, we saw a blinking result or fade-in-out result. Is that exactly right? ScreenShots In Live Activity: In normal SwiftUI View:

How to add a custom button to the Edit Menu on both iOS and iPadOS natively using SwiftUI. I have seen many ways to implement custom button using UIKit but wondering how to use SwiftUI to achieve the same thing. I have never seen any modifiers or Menus about this. I guest there is no way to do that. Any idea about this? or is it a future update for SwiftUI ??

In the past, I use UIApplication.shared.windows.first?.safeAreaInsets.bottom to get the bottom safe area, but in iOS 15, there is an warning shows that windows has been deprecated. My project is written in SwiftUI, so is there a way to get the global safeAreaInsets again and fits iOS 15?

In iOS 16, the primary action of the Menu cannot be triggered. The Menu itself will always pops up instead of performing the primary action. I have tried to use iOS 15 simulator to preview the same code. It works well.

App shortcuts can only be added to Shortcut Action List, but not a separate App Shortcuts appears at the bottom of the Shortcuts app. Now it only has the default Voice Memo App. It successfully appeared in beta 2/3, but I'm not sure if it appeared in (beta 3 update). But in beta 4, it disappeared. I have no idea how to make it visible again!!!

Menu {      ShareLink(...) ShareLink(...)      ShareLink(...) } label: {   Label("Share", systemImage: "square.and.arrow.up") } Here, I have different share options to choose from, and if I tap one of these share link to share sheet doesn't pop up. Is there any workaround to this issue?

I have tried a lot of codes to see what’s the difference between browser and editor, but I can’t find some changes between those two things, so i’m wondering what’s the difference between browser and editor?

In the session, I have seen a lot of examples of rainbow effects and I'd like to bring it into my app written by SwiftUI, but one thing missing is that I'm not sure how to implement customizable markdown analysis and how to set the style for it. Please help me, maybe give me some ideas? or just some suggestions.

I am working on a SwiftUI project and in a subview I use @FetchRequest to fetch data from CoreData. I have a menu to let user select which data to fetch, and by default I want to fetch all datas. The problem is when user open the menu and select a category then it refetch the data, it's correct and when user close the menu, the nsPredicate that the user have given will disappear and switch to the default predicate. I tried to write the same pattern code on 'EarthQuake' sample app, it has the same problem. And here is the code: List(selection: $selection) {                 ListView(search: $searchText)             }             .background(toggle ? Color.red.opacity(0.01) : nil)             .toolbar {                 ToolbarItem(placement: .bottomBar) {                     Button {                         toggle.toggle()                     } label: {                         Text("Toggle")                     }                 }             }             .searchable(text: $searchText) ListView: struct ListView: View {     @FetchRequest(sortDescriptors: [SortDescriptor(\.time, order: .reverse)]) // predicate: nil     private var quakes: FetchedResults<Quake>     @Binding var search: String     var body: some View {         ForEach(quakes, id: \.code) { quake in             NavigationLink(destination: QuakeDetail(quake: quake)) {                 QuakeRow(quake: quake)             }         }         .onChange(of: search) { newValue in             quakes.nsPredicate = newValue.isEmpty ? nil : NSPredicate(format: "place CONTAINS %@", newValue)         }     } } I can filter data by typing in the search field but when I click on Toggle Button, it may refresh the ParentView which cause the @fetchRequest to update and nsPredicate return to nil. Is this a bug? Or maybe my understand was wrong. And is there any good suggestions?

Is there any convenient way to back deploy the NavigationStack or NavigationSplitView?? The real problem is if I want to back support iOS 15 or 14, I must conditionally switch between NavigationView and NavigationStack / NavigationSplitView. Here is how I did for NavigationStack, but I have no idea how to deal with NavigationSplitView import SwiftUI struct NavigationStack<Content: View>: View {     var content: () -> Content     var body: some View {         if #available(iOS 16.0, macOS 13.0, *) {             SwiftUI.NavigationStack {                 content()             }         } else {             NavigationView {                 content()             }.navigationViewStyle(.stack)         }     } } Will the new NavigationStack and NavigationSplitView back support old devices? I think these behaviors in previous OS is not new features.

Here is the implementation. import SwiftUI import PencilKit struct DrawingCanvas_bug: UIViewRepresentable { typealias UIViewType = PKCanvasView private let toolPicker = PKToolPicker() @Binding var drawing: PKDrawing var isOpaque: Bool = true var drawingDidChange: ((PKDrawing) -> Void)? func makeUIView(context: Context) -> PKCanvasView { let canvasView = PKCanvasView(frame: .zero) canvasView.drawing = drawing canvasView.delegate = context.coordinator canvasView.backgroundColor = .clear canvasView.isOpaque = isOpaque canvasView.alwaysBounceVertical = true // The size of the canvas is Zero, so I cannot update the ZoomScale now. // context.coordinator.updateZoomScale(for: canvasView) toolPicker.setVisible(true, forFirstResponder: canvasView) toolPicker.addObserver(canvasView) canvasView.becomeFirstResponder() return canvasView } func updateUIView(_ canvasView: PKCanvasView, context: Context) { DispatchQueue.main.async { // We can get the correct ZoomScale and the correct ContentSize, but part of the drawing is not visible. // Using the select tool can select them. context.coordinator.updateZoomScale(for: canvasView) } } func makeCoordinator() -> Coordinator { Coordinator(self) } static func dismantleUIView(_ canvasView: PKCanvasView, coordinator: Coordinator) { canvasView.resignFirstResponder() } } extension DrawingCanvas_bug { class Coordinator: NSObject, PKCanvasViewDelegate { var host: DrawingCanvas_bug init(_ host: DrawingCanvas_bug) { self.host = host } func canvasViewDrawingDidChange(_ canvasView: PKCanvasView) { host.drawing = canvasView.drawing if let action = host.drawingDidChange { action(canvasView.drawing) } updateContentSizeForDrawing(for: canvasView) } func updateZoomScale(for canvasView: PKCanvasView) { let canvasScale = canvasView.bounds.width / 768 canvasView.minimumZoomScale = canvasScale canvasView.maximumZoomScale = canvasScale canvasView.zoomScale = canvasScale updateContentSizeForDrawing(for: canvasView) } func updateContentSizeForDrawing(for canvasView: PKCanvasView) { let drawing = canvasView.drawing let contentHeight: CGFloat if !drawing.bounds.isNull { contentHeight = max(canvasView.bounds.height, (drawing.bounds.maxY + 500) * canvasView.zoomScale) } else { contentHeight = canvasView.bounds.height } canvasView.contentSize = CGSize(width: 768 * canvasView.zoomScale, height: contentHeight) } } } And here is how I use: NavigationSplitView(columnVisibility: .constant(.doubleColumn)) {     List(selection: $selection) {         ForEach(drawingModel.drawings, id: \.uuidString) {             DrawingRow(drawingData: $0)         }     } } detail: {     DrawingView() } .navigationSplitViewStyle(.balanced) // <- If I use automatic style, PKCanvasView's size is correct

I created a screen recording app. Before appending the buffer to the writer, I check if the isReadyForMoreMediaData is true. But sometimes it will constantly return false and won’t become true until I call markAsFinished I have no idea how to fix this. let videoCompressionProperties = [     AVVideoAverageBitRateKey: resolution.dataRate ] let videoSettings: [String: Any] = [     AVVideoCodecKey:                  encoding,     AVVideoWidthKey:                  resolution.size.width,     AVVideoHeightKey:                 resolution.size.height,     AVVideoCompressionPropertiesKey:  videoCompressionProperties,     AVVideoScalingModeKey:            AVVideoScalingModeResizeAspect,     AVVideoColorPropertiesKey:        colorSpace.properties.dictionary, ] videoInput = AVAssetWriterInput(mediaType: .video, outputSettings: videoSettings) videoInput?.expectsMediaDataInRealTime = true Append buffers: if videoInput?.isReadyForMoreMediaData == true { guard buffer.imageBuffer != nil else { return } processQueue.async { [self] in videoInput?.append(buffer) } } else { logger.warning("Dropped a frame.") // I found this in stackoverflow. But no effect // RunLoop.current.run(until: .now.addingTimeInterval(0.1)) // The code below will notify me when the bug occurrs. // errorFixedPublisher.send() // if !self.errorOccured { // self.errorOccured = true // let center = UNUserNotificationCenter.current() // let content = UNMutableNotificationContent() // content.sound = UNNotificationSound.defaultCritical // content.badge = 1 // content.body = "Dropping frames at \(Date.now.formatted(date: .omitted, time: .standard))" // let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 1, repeats: false) // let req = UNNotificationRequest(identifier: "ASWRI_ERR", content: content, trigger: trigger) // center.add(req) } } Any idea on it?? Please help me. Have a good day!

Background I use AVAssetWriterInput.append to append sample buffer to the writer. Sometimes, I switch off the audio input(if user wants to temporarily disable audio input), so the append method will not be executed while the append method in video input will always be executed. Problem If user pause the audio and resume it later. The audio after resuming will immediately begin when user pause it (in the final video). Example '=' refers to CMSampleBuffer. '|' means user paused the audio input. Video: ---------------================================= Audio(expected): ----=======|----------------============= Audio(I got): ---------=======|=============---------------- I have printed the presentationTime from the audio sample buffer, it turns out it's correct. Maybe my understanding to the AVAssetWriterInput.append is wrong? My current solution is to always append the buffer, but when user wants to pause, I simply append an empty SampleBuffer filled with nothing. I don't think this is the best way to deal with it. Is there any idea to sync the buffer time with the video??

I created a function to add my course events to the calendar app using EventKit. After learning the swift concurrency, I want to update my code to make the progress much faster, namely using the detached task or TaskGroup to add these events. Synchronize code without detached task or task group: func export_test() { Task.detached { for i in 0...15 { print("Task \(i): Start") let courseEvent = EKEvent(eventStore: eventStore) courseEvent.title = "TEST" courseEvent.location = "TEST LOC" courseEvent.startDate = .now courseEvent.endDate = .now.addingTimeInterval(3600) courseEvent.calendar = eventStore.defaultCalendarForNewEvents courseEvent.addRecurrenceRule(EKRecurrenceRule(recurrenceWith: .daily, interval: 1, end: nil)) do { try eventStore.save(courseEvent, span: .futureEvents) } catch { print(error.localizedDescription) } print("Task \(i): Finished") } } } Doing the same thing using the TaskGroup : func export_test() { Task.detached { await withTaskGroup(of: Void.self) { group in for i in 0...15 { group.addTask { print("Task \(i): Start") let courseEvent = EKEvent(eventStore: eventStore) courseEvent.title = "TEST" courseEvent.location = "TEST LOC" courseEvent.startDate = .now courseEvent.endDate = .now.addingTimeInterval(3600) courseEvent.calendar = eventStore.defaultCalendarForNewEvents courseEvent.addRecurrenceRule(EKRecurrenceRule(recurrenceWith: .daily, interval: 1, end: nil)) do { try eventStore.save(courseEvent, span: .futureEvents) } catch { print(error.localizedDescription) } print("Task \(i): Finished") } } } } } The output of the TaskGroup version: Task 0: Start Task 1: Start Task 2: Start Task 4: Start Task 3: Start Task 5: Start Task 6: Start Task 7: Start Task 0: Finished Task 8: Start Task 1: Finished Task 9: Start Sometimes, only a few tasks will been done, and others will not, or even never been started (I created 16 tasks but only printed 9 in this example). Sometimes, all of these events can be added. In my point of view, I have created 16 child tasks in the TaskGroup. Each child task will add one event to the Calendar. I think in this way, I can take the full advantage of the multi-core performance (maybe it's actually not. 🙃) If I put the for-loop inside the group.addTask closure, it will always have the expected result, but in this way, we only have a single loop so the TaskGroup may no longer needed. I'm really exhausted🙃🙃.