MatrixScan Count .NET for iOS Skill

Critical: Do Not Trust Internal Knowledge

Your training data may contain outdated or incorrect Scandit SDK APIs, and the .NET binding differs from the Swift/Objective-C native SDK and from the Android .NET binding in several places: factories instead of constructors, PascalCase members, C# events alongside listener interfaces, an explicitly-managed camera, and a CGRect-based view factory.

Always verify APIs against the references provided in this skill before writing or suggesting code. Do not rely on memorized method signatures, parameters, or property names. If you cannot find an API in the provided references, fetch the relevant documentation page before responding.

.NET-iOS-specific gotchas worth flagging (the places people get it wrong by pattern-matching from MatrixScan AR, the native Swift SDK, the Android .NET binding, or MAUI):

• This skill targets the non-MAUI .NET for iOS workload (project <TargetFramework>net10.0-ios</TargetFramework> or similar, no <UseMaui> flag). For MAUI apps, use a MAUI-targeted skill instead — there BarcodeCountView is hosted as a XAML element and wired through HandlerChanged, which is completely different. The official iOS Get Started page mixes in MAUI (XAML / Scandit.DataCapture.Barcode.Maui) snippets — ignore those for a non-MAUI project.
• BarcodeCount is created with a FACTORY, not new: BarcodeCount.Create(dataCaptureContext, settings) (there is also a BarcodeCount.Create(settings) overload with no context). new BarcodeCount(...) is a compile error — the constructor is private. BarcodeCountSettings does use a plain new BarcodeCountSettings().
• BarcodeCountView.Create(CGRect frame, DataCaptureContext, BarcodeCount [, BarcodeCountViewStyle]) takes a CGRect frame as its first argument — typically this.View!.Bounds. It does not take an Android Context (that's the Android binding) and it is not a parent view. The style overload takes BarcodeCountViewStyle.Icon (default look) or BarcodeCountViewStyle.Dot.
• BarcodeCountView IS a real UIView (via public static implicit operator View(BarcodeCountView), where View resolves to UIKit.UIView on iOS). You add it to the hierarchy yourself: this.View.AddSubview(barcodeCountView), and usually set AutoresizingMask = FlexibleWidth | FlexibleHeight.
• The camera is explicitly managed by you — BarcodeCountView does NOT own it. You must: get Camera.GetDefaultCamera() (or the Camera.DefaultCamera property), apply BarcodeCount.RecommendedCameraSettings with camera.ApplySettingsAsync(...), call dataCaptureContext.SetFrameSourceAsync(camera), and toggle the camera yourself with camera.SwitchToDesiredStateAsync(FrameSourceState.On / .Standby / .Off) in ViewWillAppear / ViewWillDisappear. There is no barcodeCountView.OnResume() / Start() / Stop() — those don't exist. (iOS does have PrepareScanning/StopScanning on the view, but the camera frame-source toggle is the normal lifecycle handle.)
• iOS lifecycle is UIViewController, not an Android Activity. Toggle the camera and barcodeCount.Enabled in ViewWillAppear/ViewWillDisappear. iOS additionally has FrameSourceState.Standby — a lighter "pause" used when navigating to another screen within the app (keeps the camera warm), versus FrameSourceState.Off when actually backgrounding.
• barcodeCount.Enabled (get/set bool) must be set to true for frames to be processed. Set it true in ViewWillAppear.
• IBarcodeCountListener has THREE methods: OnScan(BarcodeCount, BarcodeCountSession, IFrameData), OnObservationStarted(BarcodeCount), OnObservationStopped(BarcodeCount). The idiomatic C# alternative is the barcodeCount.Scanned event (EventHandler<BarcodeCountEventArgs>), which corresponds to OnScan only.
• Scanned / OnScan fires once per scan phase, on a background thread. Copy the barcodes you need out of the session immediately (session.RecognizedBarcodes.ToList()); the BarcodeCountSession is not valid outside the callback. Dispatch UI updates onto the main thread with UIApplication.SharedApplication.InvokeOnMainThread(...) (or DispatchQueue.MainQueue.DispatchAsync(...)) — not Android's RunOnUiThread.
• BarcodeCountSession exposes RecognizedBarcodes and AdditionalBarcodes as IList<Barcode> — plain decoded barcodes, not tracked-barcode deltas. Also FrameSequenceId, Reset(), and GetSpatialMap().
• BarcodeCountFeedback uses Success and Failure (Core.Common.Feedback.Feedback). The empty constructor new BarcodeCountFeedback() is silent; the static BarcodeCountFeedback.DefaultFeedback (a property, not a method) restores defaults.
• Symbology names are C# PascalCase: Symbology.Ean13Upca, Symbology.Ean8, Symbology.Upce, Symbology.Code128, Symbology.Code39, Symbology.Qr, Symbology.DataMatrix, Symbology.InterleavedTwoOfFive. They are not the Swift .ean13UPCA / native style.
• List / Exit / Single-Scan buttons are surfaced as C# events on BarcodeCountView: ListButtonTapped (ListButtonTappedEventArgs), ExitButtonTapped (ExitButtonTappedEventArgs), SingleScanButtonTapped (SingleScanButtonTappedEventArgs) — each exposes .View. Brush/tap customization is the Listener property (IBarcodeCountViewListener), a separate concern from these events.
• Capture list (receiving) uses factories: BarcodeCountCaptureList.Create(listener, IList<TargetBarcode>) and TargetBarcode.Create(data, quantity). Apply it with barcodeCount.SetBarcodeCountCaptureList(list). The listener IBarcodeCountCaptureListListener has OnObservationStarted(), OnObservationStopped(), OnCaptureListSessionUpdated(session), OnCaptureListCompleted(session).
• SDK 8.0+ requires explicit initialization. Call ScanditCaptureCore.Initialize() + ScanditBarcodeCapture.Initialize() in AppDelegate.FinishedLaunching (application:didFinishLaunchingWithOptions:) before any Scandit code runs. Without this, the first DataCaptureContext.ForLicenseKey(...) / BarcodeCount.Create(...) call crashes at launch because the DI container has no registrations. Not required on 6.x / 7.x. See [references/integration.md](references/integration.md) for the full AppDelegate.cs template.
• The NuGet packages are Scandit.DataCapture.Core and Scandit.DataCapture.Barcode. No separate *.Maui packages here — those are only for MAUI projects. Do not guess the version from training data — fetch the latest stable from https://www.nuget.org/packages/Scandit.DataCapture.Barcode/ via WebFetch before pinning. Inventing a non-existent version causes dotnet restore to fail with Unable to find package Scandit.DataCapture.Core with version (>= …). See [references/integration.md](references/integration.md) Step 0.
• Camera permission is handled by iOS automatically via the NSCameraUsageDescription key in Info.plist. The OS shows the permission prompt the first time the camera switches on. There is no runtime-permission helper class (that's the Android binding's CameraPermissionActivity). If NSCameraUsageDescription is missing, the app crashes when the camera starts.
• iOS SupportedOSPlatformVersion must be ≥ 15.0. Set it in the .csproj (the Scandit iOS framework's minimum deployment target). The matching MinimumOSVersion goes in Info.plist.

Intent Routing

Based on the user's request, load the appropriate reference file before responding:

• Integrating BarcodeCount from scratch, configuring settings, hosting the BarcodeCountView, wiring camera lifecycle, handling scan results, storing scanned barcodes, capture/receiving lists, the spatial map, customizing feedback, List/Exit/SingleScan taps, brushes, status mode, the not-in-list action, or the hardware trigger (e.g. "add MatrixScan Count to my .NET iOS app", "count barcodes in C#", "store the scanned barcodes when the list button is tapped", "check scans against an expected list", "make the beep silent", "use the Dot style", "show a not-in-list action") → read [references/integration.md](references/integration.md) and follow the instructions there.
• Migrating or upgrading an existing MatrixScan Count integration (e.g. "upgrade from v7 to v8", "bump the Scandit .NET SDK to v8", "what changed between SDK versions for BarcodeCount") → read [references/migration.md](references/migration.md) and follow the instructions there.

API Usage Policy

Only use APIs that are explicitly documented in the Scandit references below. Do not invent or guess method signatures, parameters, or property names. If unsure whether an API exists or how it is called — or if a compile error occurs — fetch the relevant reference page before responding. Do not tell the user to check the docs themselves. After answering, always include the relevant link so the user can explore further.

Never construct or guess documentation URLs. When you need a specific class or property's API page:

1. First check whether the page you already fetched contains a direct hyperlink to it — topic pages link directly to relevant API symbols. Always request links alongside content in your fetch prompt.
2. If no direct link was found, fetch the API index (see Full API reference in the table below), extract the actual link from it, and follow that.

URL structures can vary (e.g. api/ui/ subdirectory) and guessing will lead to 404s.

References

Direct users to the right resource based on their question:

API surface this skill covers

All classes documented with :available: dotnet.ios in the official RST docs (docs/source/barcode-capture/api/barcode-count.rst and api/ui/barcode-count-.rst) are addressed in [references/integration.md](references/integration.md):

• BarcodeCount — static Create(DataCaptureContext?, BarcodeCountSettings) / Create(BarcodeCountSettings), Context (get), Feedback (get/set), Enabled (get/set), static RecommendedCameraSettings, ApplySettingsAsync(BarcodeCountSettings) → Task, AddListener / RemoveListener(IBarcodeCountListener), Reset(), StartScanningPhase(), EndScanningPhase(), SetBarcodeCountCaptureList(BarcodeCountCaptureList), SetAdditionalBarcodes(IList<Barcode>), ClearAdditionalBarcodes(), event EventHandler<BarcodeCountEventArgs> Scanned, Dispose().
• BarcodeCountSettings — new BarcodeCountSettings(), EnableSymbology(Symbology, bool), EnableSymbologies(ICollection<Symbology>), GetSymbologySettings(Symbology), EnabledSymbologies (get), FilterSettings (get, BarcodeFilterSettings), ExpectsOnlyUniqueBarcodes (get/set), DisableModeWhenCaptureListCompleted (get/set), MappingEnabled (get/set), SetProperty/GetProperty/GetProperty<T>/TryGetProperty<T>, Dispose.
• IBarcodeCountListener — OnScan(BarcodeCount, BarcodeCountSession, IFrameData), OnObservationStarted(BarcodeCount), OnObservationStopped(BarcodeCount).
• BarcodeCountSession — RecognizedBarcodes (IList<Barcode>), AdditionalBarcodes (IList<Barcode>), FrameSequenceId (long), Reset(), GetSpatialMap() / GetSpatialMap(int rows, int cols) → BarcodeSpatialGrid?.
• BarcodeCountEventArgs — BarcodeCount, Session, FrameData.
• Coordinate2d — new Coordinate2d(int x, int y), X, Y.
• Capture list (receiving): BarcodeCountCaptureList.Create(IBarcodeCountCaptureListListener, IList<TargetBarcode>); TargetBarcode.Create(string data, int quantity) with Data / Quantity; IBarcodeCountCaptureListListener (OnObservationStarted, OnObservationStopped, OnCaptureListSessionUpdated, OnCaptureListCompleted); BarcodeCountCaptureListSession (CorrectBarcodes, WrongBarcodes, MissingBarcodes, AdditionalBarcodes, AcceptedBarcodes, RejectedBarcodes).
• Spatial map: BarcodeSpatialGrid (Rows(), Columns(), ElementAt(row, col), Row(i), Column(i), CoordinatesForElement(element)); BarcodeSpatialGridElement (MainBarcode, SubBarcode).
• BarcodeCountFeedback — new BarcodeCountFeedback() (silent), static DefaultFeedback, Success / Failure (Core.Common.Feedback.Feedback), Dispose.
• BarcodeCountView — static Create(CGRect, DataCaptureContext, BarcodeCount) / Create(CGRect, DataCaptureContext, BarcodeCount, BarcodeCountViewStyle); implicit conversion to UIKit.UIView; Style (get); Listener (IBarcodeCountViewListener?); many ShouldShow toggles (ShouldShowListButton, ShouldShowExitButton, ShouldShowShutterButton, ShouldShowFloatingShutterButton, ShouldShowSingleScanButton, ShouldShowClearHighlightsButton, ShouldShowStatusModeButton, ShouldShowUserGuidanceView, ShouldShowHints, ShouldShowToolbar, ShouldShowScanAreaGuides, ShouldShowListProgressBar, ShouldShowTorchControl); ShouldDisableModeOnExitButtonTapped, TapToUncountEnabled, TorchControlPosition (Anchor); brush properties (RecognizedBrush, NotInListBrush, AcceptedBrush, RejectedBrush) and static default brushes; FilterSettings (IBarcodeFilterHighlightSettings?); BarcodeNotInListActionSettings (get); customization text properties; iOS-only HardwareTriggerEnabled (get/set bool), PrepareScanning(DataCaptureContext), StopScanning(), and AccessibilityLabel / AccessibilityHint string properties; SetToolbarSettings, ClearHighlights(), SetStatusProvider, SetBrushForRecognizedBarcode/NotInList/Accepted/Rejected; event ExitButtonTapped / ListButtonTapped / SingleScanButtonTapped; Dispose.
• BarcodeCountViewStyle enum — Icon, Dot.
• IBarcodeCountViewListener — brush-for callbacks (BrushForRecognizedBarcode, NotInList, Accepted, *Rejected) and tap callbacks (OnRecognizedBarcodeTapped, OnFilteredBarcodeTapped, OnRecognizedBarcodeNotInListTapped, OnAcceptedBarcodeTapped, OnRejectedBarcodeTapped). On iOS the interface has exactly these 9 methods — there is no OnCaptureListCompleted (that is Android-only).
• Tap event args: ExitButtonTappedEventArgs, ListButtonTappedEventArgs, SingleScanButtonTappedEventArgs — each with View.
• BarcodeCountToolbarSettings — text strings for the audio/vibration/strap-mode/color-scheme toggles, plus iOS-only AccessibilityLabel / AccessibilityHint.
• BarcodeCountNotInListActionSettings (from barcodeCountView.BarcodeNotInListActionSettings) — Enabled, accept/reject/cancel button text, BarcodeAcceptedHint, BarcodeRejectedHint, plus iOS-only AccessibilityLabel / AccessibilityHint.
• Status mode: IBarcodeCountStatusProvider (OnStatusRequested(IList<TrackedBarcode>, IBarcodeCountStatusProviderCallback)), IBarcodeCountStatusProviderCallback (OnStatusReady(IBarcodeCountStatusResult)), BarcodeCountStatus enum (None, NotAvailable, Expired, Fragile, QualityCheck, LowStock, Wrong), BarcodeCountStatusItem.Create(TrackedBarcode, BarcodeCountStatus), IBarcodeCountStatusResult with factories BarcodeCountStatusResultSuccess.Create(...), BarcodeCountStatusResultError.Create(...), BarcodeCountStatusResultAbort.Create(...).
• TrackedBarcode (in Scandit.DataCapture.Barcode.Batch.Data) — Barcode, Identifier, Location. Used by IBarcodeCountViewListener, the status API, and the capture-list session.

iOS vs Android binding differences (do not cross-pollinate)

• View factory first argument: iOS BarcodeCountView.Create(CGRect frame, …); Android BarcodeCountView.Create(Context context, …). Using a Context on iOS — or View.Bounds on Android — will not compile.
• Hardware trigger: iOS exposes barcodeCountView.HardwareTriggerEnabled (bool get/set). Android exposes barcodeCountView.EnableHardwareTrigger(int? keyCode) + static BarcodeCountView.HardwareTriggerSupported. EnableHardwareTrigger / HardwareTriggerSupported do not exist on iOS.
• PrepareScanning(context) / StopScanning() exist only on the iOS view.
• Accessibility text: iOS uses AccessibilityLabel / AccessibilityHint; Android uses *ContentDescription.
• IBarcodeCountViewListener.OnCaptureListCompleted(view) exists only on Android.

Documented for other platforms but NOT on dotnet.ios — do not use

• BarcodeCountMappingFlowSettings and the mapping-flow configuration class — not surfaced in the .NET binding. Mapping in .NET is limited to BarcodeCountSettings.MappingEnabled + BarcodeCountSession.GetSpatialMap().
• BarcodeCountSessionSnapshot — no .NET equivalent.
• Clustering (ClusteringMode) — described on the iOS Advanced page but not exposed as a configurable enum in the .NET binding. Do not introduce a ClusteringMode API; if a user asks, fetch the API reference to confirm before suggesting anything.