DeliveredVerificationCodesManager.oneTimeCodes(preferredDuration:) loses its default argument, making the preferredDuration parameter now explicitly required at all call sites.

CustomStage has two breaking API changes: outputTypes (an array) is replaced by outputType (a single SearchPipelineDataType), and execute(statisticName:value:) is renamed to execute(statistic:value:).

New PermissionButton initializer accepts a permissionFlow and result callback alongside a custom label, enabling fully custom-styled permission prompts in SwiftUI.

New askSignificantChangePermission method added to AskCenter for requesting significant-change permission with a specified flow and context.

The onCompletion callback of photosSharedAlbumCustomizationSheet now receives an optional Error parameter instead of being a plain () -> Void, allowing callers to handle failure cases.

The sectionBy: parameter on all @Query sectioned initializers is now required (non-optional, no default) and the result type changed from ResultsSectionCollection to SectionedResults, breaking existing call sites that relied on the optional/defaulted form.

waitForRenderComplete and localizedDescription were renamed to waitForRenderCompletion and errorDescription respectively, with no other changes.

New AXSpeechAttributeSSML attributed-string key (and matching Swift accessibilitySpeechSSML attribute scope) lets developers annotate text with SSML markup to control speech synthesis output.

Three AppSchema.RemindersIntent update intents (updateGroup, updateList, updateSection) were removed, and DisplayRepresentation.Components was removed entirely.

• A new AppSchema.NotesIntent.appendText intent has been added.
• IntentFile.defaultResolverSpecification now returns an opaque some ResolverSpecification instead of the concrete EmptyResolverSpecification.

The entire AppManagedFeaturesError enum (and all its cases) has been removed from the public API.

ASDeliveredVerificationCodesManager.oneTimeCodes(preferredDuration:anchor:) loses its default argument for preferredDuration, requiring call sites that relied on the default to now pass an explicit value.

macOS/Catalyst gains support for allowlisting arbitrary binary executables in assessment sessions, via the new AEAssessmentBinaryExecutable and AEAssessmentBinaryExecutableConfiguration types.

• AEAssessmentApplication.teamIdentifier and its corresponding initializer are now available on iOS 27, removing the previous iOS exclusion.
• AEAssessmentConfiguration adds allowsForceQuit and allowVirtualMachine policy properties (macOS/Catalyst only).

The AVQueuedSampleBufferRendering protocol and the concrete AVSampleBufferAudioRenderer/AVSampleBufferVideoRenderer classes deprecate their callback-based media-data enqueueing APIs in Swift, directing developers to use the new sampleBufferReceiver/Receiver async pattern instead.

• AVCaptureSystemPressureFactorSystemStress was renamed to AVCaptureSystemPressureFactorBatteryStress, reflecting a more precise description of that pressure factor.
• AVAssetExportSessionResumptionFailureReasonIncompatiblePreset was removed and replaced by AVAssetExportSessionResumptionFailureReasonUnsupportedForPresetOnPlatform.

Minor update — the deprecation message on the synchronous submitTaskRequest:error: method was revised to mention the Swift async/await overload alongside the completion-handler alternative.

No functional API changes — the only diff is an added ObjectiveC framework import.

Minor address-space precision fix — lines and line_strip in the debug-draw API now explicitly annotate their float3 array parameters with the thread address space, with no functional behavior change.

CNContactSavedAutoFillDetailsController has been removed and the framework now imports AppIntents modules, suggesting autofill contact functionality is migrating to an App Intents-based model.

AudioServerPlugInRegisterMediaDeviceExtension is now explicitly unavailable on visionOS (previously unspecified).

NSPersistentCloudKitContainerEvent gains NS_SWIFT_SENDABLE, making it usable across actor boundaries without a compiler warning.

New CGPDFStructureElement and CGPDFMarkedContentItem types (iOS 27+) provide a structured API for authoring tagged PDF documents with a proper structure tree, replacing the older begin/end tag approach.

• CGContext gains new marked-content methods (beginMarkedContentSequence, endMarkedContentSequence, beginObjectReference, addStructureTreeRootChild) for associating drawn content with structure elements.
• A new CGPDFTagType.artifact tag type is added for marking non-structural content in tagged PDFs.

CIRAWFilter gains a downloadResources(timeout:completionHandler:) method for fetching decoder resources on demand, and CIImageProcessor gets cleaner Swift names for its tiled/surface/pixel-buffer APIs.

• Metal kernel sampler and destination types in CIKernelMetalLib.h now mark all member functions with the thread address-space qualifier, which may require recompilation of custom Metal kernels.
• temporaryPixelBuffer(identifier:format:width:height:attributes:) is now marked CF_RETURNS_NOT_RETAINED, clarifying its memory ownership contract.

Two new metadata format description keys (kCMMetadataFormatDescriptionKey_HumanReadableString and kCMMetadataFormatDescriptionMetadataSpecificationKey_HumanReadableString) allow attaching human-readable strings to metadata format descriptions and specifications.

The webBrowser app category was removed from CTSlicingManager.AppCategory, and a new CTCellularPlanStatusAuthorizationNotSupported case was added to CTCellularPlanStatus on iOS 27.

New Insecure.UnauthenticatedAES and Insecure.UnauthenticatedChaCha20 types expose raw, unauthenticated block permutation and stream cipher operations for use cases where authentication is handled separately.

Three new error cases added to AgeRangeService.Error covering declined onboarding, invalid account, and network failures.

Minor conformance removals — BorrowingSequence has been dropped from Span, MutableSpan, RawSpan, MutableRawSpan, and InlineArray, likely reflecting a protocol design change in the Swift standard library.

Metadata dictionaries throughout the framework changed type from [String: any Sendable & Codable & Equatable] to [String: GeneratedContent] (or ConvertibleToGeneratedContent at call sites), which is a breaking change affecting every respond/streamResponse call and transcript type that passes metadata.

• The Transcript.CustomSegment protocol and related Transcript.Segment.custom case were removed, eliminating custom segment extensibility.
• Transcript.history and SessionPropertyValues.history now return the new Transcript.HistoryView type instead of ArraySlice<Transcript.Entry>.
• SystemLanguageModel.Variant is a new struct (with core3 and coreAdvanced3 values) exposing named model variants via a new SystemLanguageModel.variant property.

New kCGImageSourcePrioritizeQuality option lets you request higher-quality decoding when creating images from a source.

The entire Intents notebook/tasks API surface (all note- and reminder-related intents, types, and resolution results — INAddTasksIntent, INCreateNoteIntent, INSearchForNotebookItemsIntent, INSetTaskAttributeIntent, INSnoozeTasksIntent, and all associated types) is deprecated as of iOS 27/watchOS 27, with the migration message directing developers to adopt the Notes or Reminders AppSchema domain instead.

Two new provisional clusters (MTRBaseClusterMediaFileManagement and MTRBaseClusterAudioControl) are added alongside significant expansions to several existing media clusters.

• ContentLauncher gains contentReplicationRequest, playPreset, new queue/preset attributes and status codes, and a ContentReplication event; MediaPlayback gains AvailableCommands and ContentInfo attributes.
• ClosureControl and ClosureDimension each gain new grouped commands (groupedMoveTo, groupedSetTarget, groupedStep) and a new Access feature flag.
• AppleAccessoryErrors receives a comprehensive set of provisional error-category, severity, and error-code enumerations.

reportRealtimeSampleDeliveryKPIs(session:metKPIs:) has been replaced by reportQualityMetricsPassed(_:forSession:) on MediaDeviceRoutingManager, with reordered parameters and a renamed method.

New framework with no public API additions beyond a UniformTypeIdentifiers import dependency — no developer-facing symbols are exposed yet.

Minor fix — a semicolon typo in the MSUPIRequest availability declaration was corrected, with no functional API changes.

ScrollHitchTimeMetric is removed and hitch-time measurements are now typed with the new HitchTimeRatio unit class instead of the generic Foundation.Unit.

• HitchTimeMetric.ratio and SignpostIntervalMetric.hitchTimeRatio change from Measurement<Unit> to Measurement<HitchTimeRatio>, requiring updates to any code that handled the untyped form.
• LocationActivityMetric gains a reducedAccuracy property for tracking time spent in reduced-accuracy location mode.

Conditional memory-management attribute added to NISession.delegateQueue to correctly handle dispatch_queue_t ownership under non-Objective-C object runtimes.

Several NEPacketTunnelNetworkSettings properties that were newly introduced in this SDK cycle (includeAllNetworks, excludeLocalNetworks, excludeCellularServices, excludeAPNs, excludeDeviceCommunication, enforceRoutes) and the associated IPFamily enum have been marked API_UNAVAILABLE on all platforms, effectively pulling them from the public API before release.

PKStrokeRenderStateReference type alias has been removed with no replacement added.

Three new payment network constants added (PKPaymentNetworkPayPak, PKPaymentNetworkMaal, PKPaymentNetworkElcard), with no other changes.

Several internal platform-abstraction macros (PDFKitPlatformTouch, PDFKitPlatformGestureRecognizer and its variants, PDFKitPlatformTableView, PDFKitPlatformComboBox, PDFKitPlatformUserInterfaceLayoutDirection and its variants) have been removed from the public header, narrowing the set of cross-platform type aliases PDFKit exposes.

The internal Objective-C bridge type for stroke render state has been renamed/restructured: __PKStrokeRenderState is replaced by the now-public PKStrokeRenderStateReference class (previously NS_REFINED_FOR_SWIFT-hidden), and the asObjCRenderState() helper method is removed accordingly.

New framework introducing PermissionFlow and PermissionResult types that model parental-approval permission flows, including in-person approval and ask-to-approve delegation patterns.

The background-upload job extension API gains a new PHAssetResourceUploadJobOptions type (with a preventsExpensiveNetworkAccess flag) and replaces the deprecated setUploadJobExtensionEnabled:error: with separate enableUploadJobExtensionWithOptions:error: and disableUploadJobExtensionWithError: methods.

• PHAssetResource.originalFilename is deprecated in favor of a new nullable filename property.
• PHAsset.addedDate is corrected to nullable, and PHAssetExtendedMetadata.originalFileName is renamed to originalFilename.

PHSharedAlbumCreationResult gains an error property and makes albumIdentifier/albumURL optional to represent failure cases, and PHPickerSearchText adds an initializer from UIPhotoSearchSuggestion (iOS only).

QuickLook now imports UniformTypeIdentifiers instead of CoreTransferable.

PortalComponent.BoundaryMode.disabled is renamed to .none, and two Entity component-access subscripts are removed.

ReplayKit is deprecated in favor of ScreenCaptureKit, with RPScreenRecorder, RPRecordingErrorDomain, and RPRecordingErrorCode all marked API_DEPRECATED targeting removal at iOS/tvOS 27.0 and macOS 27.0.

ResultsSectionCollection has been replaced by a new SectionedResults type, and the SectionName generic parameter on ResultsObserver and ResultsSection has been renamed to SectionTitle, with ResultsSection.name replaced by .title — all source-breaking changes for code using sectioned fetch results.

• HistoryToken and DefaultHistoryToken gain a storeIdentifier property, making it possible to identify which store a history token belongs to.

A large set of previously available types and APIs — including HoverEffect, AccessibilityTechnologies, AccessibilityActionKind, SymbolEffectTransition, FillShapeStyle, several View modifiers (hoverEffect, containerRelativeFrame, coordinateSpace, symbolEffect, speech modifiers), and the Transition/CustomHoverEffect protocols — have been removed from the public SDK surface in this diff.

• New drag/drop configuration APIs (dragConfiguration, dropConfiguration, onDropSessionUpdated) have been added to View.
• A new PresentationPlacement type with automatic, center, leading, and trailing options is introduced, along with a presentationPlacement(_:) view modifier.

A broad expansion of SwiftUICore's public API, migrating many types previously available only in SwiftUI (hover effects, accessibility primitives, symbol effects, speech modifiers) into the core module.

• Hover-effect infrastructure is now in SwiftUICore, including HoverEffect, AutomaticHoverEffect, HighlightHoverEffect, LiftHoverEffect, and the CustomHoverEffect protocol with a hoverEffectDisabled modifier.
• Accessibility types (AccessibilityActionKind, AccessibilityActionCategory, AccessibilityDirectTouchOptions, AccessibilityTechnologies, AccessibilityZoomGestureAction) and related environment values (accessibilityVoiceOverEnabled, accessibilitySwitchControlEnabled, accessibilityAssistiveAccessEnabled, accessibilityLargeContentViewerEnabled) are now publicly available in SwiftUICore.
• Symbol-effect support (SymbolEffectTransition, WiggleSymbolEffect.custom(angle:), symbolEffect transition/content-transition variants) and speech-modifier APIs (speechAdjustedPitch, speechSpellsOutCharacters, etc.) are also added.

UISheetPresentationController gains a preferredPlacement property (iOS/tvOS/visionOS 27.0) that lets you position a sheet at the leading edge, center, or trailing edge of the screen instead of always anchoring to the bottom.

The metadata value constraint has been promoted from USDPrim.Attribute.MetadataValue to the new USDStage.Object.MetadataValue protocol, and the custom Array/Dictionary types have been removed in favour of standard Swift collections, both of which are breaking changes for existing call sites.

• USDValue's typed-access API has been replaced: get()/uncheckedGet() are removed and superseded by value(as:) and unsafeValue(assumingType:), and arraySize/isArrayValued are renamed to arrayCount/isArray.
• USDPrim.relationship(named:) now returns a non-optional USDPrim.Relationship, and new prim APIs are added for prototype inspection (isPrototype, prototype) and API schema removal (removeAPISchema).
• USDStage.EditTarget and USDStage.OpenOptions no longer have public no-argument initializers, and USDPrim.Spec boolean properties are renamed with is prefixes (isActive, isInstanceable).

Minor additions to the low-latency frame processor APIs, adding methods to query maximum output dimensions and pixel counts for a given spatial scale factor on both VTLowLatencyFrameInterpolationConfiguration and VTLowLatencySuperResolutionScalerConfiguration, plus a new supportedScaleFactors class property on the super-resolution scaler.

RecognizeAnimalsRequest gains a typed Identifier enum (with cat, catHead, dog, dogHead cases) and a new revision3, replacing untyped string identifiers for animal recognition targets.

• GenerateIterativeSegmentationRequest adds supportedComputeStageDevices for querying which compute devices are available per pipeline stage.

Several previously iOS-only or NA-availability APIs are now promoted to full availability on macOS 27, iOS 27, and visionOS 27, and WKJSSerializedNode is replaced by WKDOMNodeSnapshot with renamed WKContentWorldConfiguration properties (e.g., nodeSnapshotCreationEnabled instead of nodeSerializationEnabled).

• WKContentWorldConfiguration received a Swift name (WKContentWorld.Configuration), property renames (openClosedShadowRootsEnabled → allowAccessingClosedShadowRoots, nodeSerializationEnabled → nodeSnapshotCreationEnabled), and proper boolean getters, while WKJSHandle had its properties renamed (frame → sourceFrame, world → contentWorld).
• WKUserContentController gains addBuffer(_:name:to:) and removeBuffer(named:from:) for passing binary data buffers into content worlds.
• WKWebpagePreferences.globalPrivacyControlStatus (a BOOL named as a status) is replaced by globalPrivacyControlEnabled with a clearer name.

The entire EnhancedLinkSecurity framework has been removed, including IMEnhancedLinkSecurityManager (EnhancedLinkSecurityManager in Swift) and all its URL-security-gating APIs.