Post not yet marked as solved
I get this error while migrating from ObservableObject to @Observable.
Call to main actor-isolated initializer 'init()' in a synchronous nonisolated context
My original code:
struct SomeView: View {
@StateObject private var viewModel = ViewModel()
}
After migration:
@MainActor @Observable class BaseViewModel {
}
@MainActor class ViewModel: BaseViewModel {
}
struct SomeView: View {
@State private var viewModel = ViewModel()
}
As discussed here. It seems like @StateObject is adding @MainActor compliance to my View under the hood because it's wrappedValue and projectedValue properties are marked as @MainActor, while on @State they are not.
@available(iOS 14.0, macOS 11.0, tvOS 14.0, watchOS 7.0, *)
@frozen @propertyWrapper public struct StateObject<ObjectType> : DynamicProperty where ObjectType : ObservableObject {
...
@MainActor public var wrappedValue: ObjectType { get }
....
@MainActor public var projectedValue: ObservedObject<ObjectType>.Wrapper { get }
}
One solution for this is to mark my View explicitly as @MainActor struct ViewModel: View but it have it side effects, for example code like:
Button(action: resendButtonAction) {
Text(resendButtonAttributedTitle())
}
Will result a warning
Converting function value of type '@MainActor () -> ()' to '() -> Void' loses global actor 'MainActor'
While could be easily solved by using instead
Button(action: { resendButtonAction() } ) {
Text(resendButtonAttributedTitle())
}
I still feel like marking the whole View explicitly as @MainActor is not a good practice.
Adding fake @StateObject property to my view also do the trick, but it's a hack (the same for @FetchRequest).
Can anyone think of a more robust solution for this?
Post not yet marked as solved
Related to this post.
In my chat view, each time I load new page (items are added from top), the ScrollView jumps to top instead of maintaining scrollPosition.
Here is my scroll view:
GeometryReader { geometryProxy in
ScrollView(showsIndicators: false) {
VStack(spacing: 0) {
if viewModel.isLoading {
LoadingFooter()
}
messagesView
.frame(minHeight: geometryProxy.size.height - loadingFooterHeight - bottomContentMargins, alignment: .bottom)
}
}
.scrollDismissesKeyboard(.interactively)
.defaultScrollAnchor(.bottom)
.scrollPosition(id: $scrolledId, anchor: .top)
.contentMargins(.bottom, bottomContentMargins, for: .scrollContent)
.onChange(of: scrolledId, scrollViewDidScroll)
}
And this is the messages view
@ViewBuilder var messagesView: some View {
LazyVStack(spacing: 0) {
ForEach(sectionedMessages) { section in
Section(header: sectionHeaderView(title: section.id)) {
ForEach(section, id: \.id) { message in
MessageView(message: message)
.padding(.horizontal, .padding16)
.padding(.bottom, .padding8)
.id(message.id)
}
}
}
.scrollTargetLayout()
}
}
Printing the scrolledId after a page load, I can see it hasn't changed, but the ScrollView position does.
Is there a good way to access the web socket task actual close code?
when looking at the task delegate:
urlSession(_ session: URLSession, webSocketTask: URLSessionWebSocketTask, didCloseWith closeCode: URLSessionWebSocketTask.CloseCode, reason: Data?)
I can see my custom code _closeCode = (long long) 4231 but the delegate (and the task's) closeCode variable is an enum (URLSessionWebSocketTask.CloseCode) so it have a fallback to the default invalid (0) for unknown values.
I wonder if using
webSocketTask.value(forKey: "_closeCode")
Count as accessing private api, or if there is a cleaner way to access this raw value.
Post not yet marked as solved
Related to this StackOverflow post (not mine).
In my chat view:
ScrollView(showsIndicators: false) {
messagesView
}
.safeAreaInset(edge: .bottom) { composerView }
.scrollDismissesKeyboard(.interactively)
Using interactively keyboard dismissing won't change the safe area size interactively causing a weird UI glitch like you can see in the post up above.
The keyboard and composer play nice when I use it as tool bar, But I want my composer to always be visible (obviously), I've tried to play with FocusState to change the composer parent:
.toolbar {
ToolbarItem(placement: $isFocused ? .keyboard : .bottomBar) {
bottomView
}
}
But not only it redraws the view each time, it will also make the view lose its focus state, affectively releasing the keyboard. Plus it feels kind of a hack.
What is the right way to make the composer move with the keyboard interactively and stay on screen while the keyboard is gone, like in iMessages?
My request call site:
let headers = coordinator.requestHeaders(path: headersPath)
var request = URLRequest(url: url, cachePolicy: .useProtocolCachePolicy, timeoutInterval: defaultTimeoutInterval)
request.httpMethod = HTTPRequestMethod.get.rawValue
request.allHTTPHeaderFields = headers
let delegate = SessionDelegate(priority: priority, progressHandler: progressHandler)
let session = URLSession(configuration: configuration, delegate: delegate, delegateQueue: .main)
let (localUrl, response) = try await session.download(for: request)
let data = try Data(contentsOf: localUrl)
SessionDelegate:
public class SessionDelegate: NSObject, URLSessionTaskDelegate, URLSessionDownloadDelegate {
public typealias ProgressHandler = ((_ progress: Double) -> Void)
public var metrics: URLSessionTaskMetrics?
private let priority: TaskPriority
private let progressHandler: ProgressHandler?
//MARK: - Lifecycle
init(priority: TaskPriority, progressHandler: ProgressHandler? = nil) {
self.priority = priority
self.progressHandler = progressHandler
}
//MARK: - URLSessionTaskDelegate
public func urlSession(_ session: URLSession, didCreateTask task: URLSessionTask) {
task.priority = priority.rawValue
}
public func urlSession(_ session: URLSession, task: URLSessionTask, didFinishCollecting metrics: URLSessionTaskMetrics) {
self.metrics = metrics
}
public func urlSession(_ session: URLSession, task: URLSessionTask, didSendBodyData bytesSent: Int64, totalBytesSent: Int64, totalBytesExpectedToSend: Int64) {
if let progressHandler {
let progress = Progress(totalUnitCount: totalBytesExpectedToSend)
progress.completedUnitCount = totalBytesSent
progressHandler(progress.fractionCompleted)
}
}
//MARK: - URLSessionDownloadDelegate
public func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) { }
public func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) {
if let progressHandler {
let progress = Progress(totalUnitCount: totalBytesExpectedToWrite)
progress.completedUnitCount = totalBytesWritten
progressHandler(progress.fractionCompleted)
}
}
}
For some reason I get delegate callbacks from URLSessionDelegate and URLSessionTaskDelegate but never from URLSessionDownloadDelegate.
I've tried assigning the delegate to the task or the session (or both), but behavior remains the same.
Not sure if related but when I try using background session configuration I crash on let (localUrl, response) = try await session.download(for: request) with the error Completion handler blocks are not supported in background sessions. Use a delegate instead. even though I use the async version of the download task, and assigning delegate to the session, it might point to the reason why none of the delegate functions is getting called (maybe?), but I have no clue why Xcode thinks I'm using completion handler.
Post not yet marked as solved
Using Xcode 15.0 beta 4
I have MapCoordinate struct:
private struct MapCoordinate: Equatable {
let location: Location
let latitude: Double
let longitude: Double
var coordinate: CLLocationCoordinate2D {
return CLLocationCoordinate2D(latitude: latitude, longitude: longitude)
}
init?(location: Location) {
guard let latitude = location.latitude,
let longitude = location.longitude else {
return nil
}
self.location = location
self.latitude = latitude
self.longitude = longitude
}
}
mapCoordinate and radius state variables:
@State private var mapCoordinate: MapCoordinate?
@State private var radius: CLLocationDistance
And a mapView:
@ViewBuilder var mapView: some View {
Map {
if let mapCoordinate {
let annotationTitle = radius.toMeasurement(unit: .meters, convertedTo: .kilometers)
Annotation(annotationTitle, coordinate: mapCoordinate.coordinate) {
Image(systemImage: .mapPinEllipse)
.fontWeight(.semibold)
}
MapCircle(center: mapCoordinate.coordinate, radius: radius)
.foregroundStyle(.teal.opacity(circleOpacity))
.stroke(.teal, lineWidth: circleStrokeLineWidth)
}
}
.mapStyle(.standard(elevation: .realistic))
.animation(.easeInOut, value: mapCoordinate)
}
When updating mapCoordinate the Annotation will animate correctly to the new coordinates, but the MapCircle will not update or change scale for neither mapCoordinate or radius changes.
Ideas?
Post not yet marked as solved
Hi I'm trying to apply clip shape on a BarMark with stacked values and the result is that it's applying the shape for each stack instead for the whole bar.
What I want to achieve:
What I got:
I noticed that corner radius is applied to the whole bar but just the top of it:
Is there any way to get this capsule shape when stacked?
My code is:
enum Value: Int, Hashable, CaseIterable {
case ftb
case nb
case remaining
var color: Color {
switch self {
case .ftb:
return .tint1
case .nb:
return .tint2
case .ramaining:
return .gray4
}
}
}
@ViewBuilder var barChart: some View {
Chart {
ForEach(dates, id: \.self) { date in
let incomeSummary = incomeSummaries.first(where: { $0.date?.inSameDay(as: date) == true })
ForEach(Value.allCases, id: \.self) { value in
barMark(for: value, date: date, incomeSummary: incomeSummary)
.foregroundStyle(value.color)
}
// .cornerRadius(20, style: .continuous)
// .clipShape(Capsule())
}
}
.chartXAxis {
AxisMarks(values: dates) { date in
AxisValueLabel(format: .dateTime.weekday(), centered: true)
}
}
.chartYAxis {
AxisMarks { mark in
AxisValueLabel()
}
}
}
private func barMark(for value: Value, date: Date, incomeSummary: IncomeSummary?) -> BarMark {
let amount = amount(for: value, in: incomeSummary)
return BarMark(x: .value("WeekDay",
date,
unit: .day,
calendar: Calendar.localTime),
y: .value("Income", amount))
}
Another issue, I've noticed that when AxisValueLabel is centered the last bar looses its label, is it a bug?
Post not yet marked as solved
Hi,
When running live preview on my main app target, for some reason I see the view for few moments, then it jumps back to the application root view controller.
Sometimes I get problem report screen right after.
Selectable previews works just fine.
And when I move my views to a clean module dedicated only for SwiftUI, Live previews works with no issues.
Any ideas?
Post not yet marked as solved
I noticed that sometimes when the webview is moved to background (have another view controller on top), it stops JavaScript functions execution, and executes them only when returning back to foreground.I read about people having the same problems with socket.io, and most of the solutions was some kind of hack, like adding the webview to the key window, or looping dummy calls to evaluateJavaScript so the webview wouldn't go to idle mode and stop JavaScript.Those solutions work btw, but I don't like them at all.I was wondering if there was a better solution for this problem, any way to configure the webView to prevent going into idle mode, or more elegant way to prioritize JavaScript.Thanks.
itayAm.