Throughout the framework, CSSearchableItem has been replaced with the new CoreSpotlight.SearchableItem type in all APIs (ScoredSearchableItem, SearchPipelineData, SpotlightSearchTool, and CustomStage), which is a breaking change for any code that passed or received CSSearchableItem directly.

Codable support added to USDStageComponent via synthesized init(from:) and encode(to:).

New framework-level imports added (MarketplaceKit and os.log); no public API additions or removals.

New accessory property added to AccessoryFeatureSession, giving extension implementations direct access to the associated accessory object.

EntityQuery.displayRepresentations(for:requestedComponents:) is renamed to displayRepresentations(for:) and InstanceDisplayRepresentable.displayRepresentation(with:) is removed, requiring call-site updates.

• AppSchema.MapsIntent.addNavigationWaypoints is replaced by updateNavigationWaypoints.
• DisplayRepresentation.init(title:subtitle:synonyms:image:) adds a synonyms parameter to the primary display representation initializer.
• IntentWidgetFamily gains a systemExtraLargePortrait case.

New FeatureManager.lock(_:) API lets managed-app providers lock features using a LockConfiguration that specifies included/excluded app bundle identifiers and web domains, with a typed FeatureManager.Error covering authorization and configuration failures.

ARKit replaces UIInterfaceOrientation-based APIs with a numeric viewRotationAngle (in radians) across ARCamera, ARFrame, and ARSession, deprecating the old orientation-parameter variants as of iOS 27.

• ARSession gains viewRotationAngle and viewLayer properties, plus a delegate callback session:didChangeViewRotationAngle: to track rotation changes without relying on UIInterfaceOrientation.
• ARCamera gets replacement methods projectionMatrix(viewRotationAngle:...), projectPoint:viewRotationAngle:..., unprojectPoint:ontoPlane...viewRotationAngle:..., and viewMatrix(viewRotationAngle:) as direct substitutes for the deprecated orientation-based equivalents.

The AccessorySensorUpdates stream now yields raw Data instead of the removed Update enum, and the Handler protocol method is renamed from didReceiveAccessorySensorMessage to handleAccessorySensorMessage — both are breaking changes requiring call-site updates.

• Session.sendMessageToTransportExtension(message:) has been removed with no apparent replacement in this diff.

New kReverb2Param_LegacyMode parameter added to the AUReverb2 audio unit, enabling a legacy reverb mode.

Minor addition — the framework now imports the Synchronization module.

New allowsAccessibilityFullKeyboardAccess property on AEAssessmentConfiguration lets macOS/Mac Catalyst assessment sessions permit full keyboard access as an accessibility accommodation.

AVPlayerItemSampleBufferOutput delegate and sample-buffer APIs are now exposed to Swift (previously hidden behind #if !__swift__), marked NS_REFINED_FOR_SWIFT to allow idiomatic Swift wrappers.

• A new AVErrorNotEnoughSpaceForProVideoStorageReplenishment error code is added for Pro Video storage conditions on macOS/iOS/tvOS 27.
• AVCaptureSystemPressureFactorSystemStress gains an explicit availability annotation (iOS/tvOS 27+, was previously unattributed).

The entire AVInterfaceControllable protocol family (and associated types like AVInterfaceMetadata) has been removed, replaced by the AVPlaybackUserInterface* equivalents that were already deprecated against in the same iOS 27.0 release cycle.

• AVLegibleMediaOptionsMenuType enum (.default, .captionAppearance) has also been removed from the public header.

New async overloads of withExclusiveControl(_:) and withExclusiveControl(before:_:) are added to BADownloadManager, and the existing callback-based versions are deprecated for Swift callers.

New async Swift wrappers (activate(), request(), suspend()) are added to ProcessCapability, and the existing activateWithError:/suspendWithError: Objective-C methods on BEProcessCapability are now marked iOS 27.0+/unavailable on macOS.

• The deprecated BECapability activate/suspend methods now have a concrete deprecation ceiling of iOS 17.4–27.0 (replacing the placeholder API_TO_BE_DEPRECATED).

CPMapPanel.sections is now mutable (readwrite), CPMapPanelButtonConfiguration.travelEstimates is now nullable, and two new CPRouteDetail factory methods (routeDetailWithInfo: and routeDetailWithParking:) were added alongside a new showsCloseButton property on CPNavigationAlert.

Parameter names added to existing function declarations — no functional or API changes.

A new maritime activity type is added to both CLActivityType and CLLiveUpdateConfiguration, enabling location tracking optimized for watercraft navigation.

Minor internal header change — CMOdometer.h now imports _LocationEssentials/CLLocationEssentials.h, which has no effect on public API.

New SearchableItem struct added with an item property — likely a Swift value-type wrapper for CSSearchableItem.

The updateUsage and removeToolCall/removeAttachmentSegment actions now require a metadata parameter and use ID-based arguments respectively, breaking existing executor channel implementations.

• LanguageModelExecutorGenerationChannel.Usage gains a metadata property, and LanguageModelSession.Usage.metadata relaxes its value type from Sendable & Codable & Equatable to plain Sendable.
• ImageReference gains a resolved(in:) method for resolving image references within a context.

New async Swift wrapper earliestAuthorizedSampleDate(for:) added to HKHealthStore for querying the earliest authorized sample dates per type (iOS/watchOS/macOS/visionOS 27+).

Two PresentationDescriptorReader methods were renamed and their time parameters changed from CMTime/CMTime? to CMTimeRange/CMTimeRange?, making this a breaking API change for any caller.

New error case hasProtectedContent added to MusicUnderstandingError.

FeatureSet.ContentVersion.version2 has been removed, indicating a supported content version has been dropped.

New APIs let apps add passes from raw NSData or archive files (via PKPassLibrary and PKAddPassesViewController) without first constructing PKPass objects, and four new payment networks (RuPay, Verve, Humo, UzCard) are added.

• PKDisbursementRequest gains unsupportedPrimaryAccountIdentifiers to filter out ineligible accounts during disbursement flows.

Three mesh deformer types have been renamed (CalculateBoundingBoxDeformer → BoundingBoxCalculator, RenormalizationDeformer → RenormalizingDeformer, OpenSubdivisionDeformer → SubdivisionSurfaceDeformer), which is a breaking change for any code using those types directly.

• The indirectDiffuseSHL1Irradiance lightmap bake type and its associated IndirectDiffuseIrradianceSHBakeDescriptor have been removed with no replacement.
• LowLevelMesh.Descriptor gains an allowsPrimitiveRestart property.

SFSafariSettings gains Mac Catalyst support (macCatalyst 27.0), including a new API to programmatically check whether AutoFill Usernames & Passwords is enabled, plus a new SFSafariSettingsError domain for error handling on that platform.

SWCollaborationView replaces the previously unavailable hasPendingAccessRequests bool with pendingAccessRequestsCount, a NSUInteger property available on iOS/macOS/visionOS 27.0 that exposes the actual count of pending access requests.

Two new methods on ModelContainer let you map between store identifiers and configuration names at runtime.

New EnvironmentValues key systemPrefersReducedResourceUsage lets apps read the system's preference for reduced resource consumption.

The buttonSizing environment value's setter has been removed, making it read-only.

RCS messages now support reactions (emoji and custom) and replies as first-class message content types, with corresponding Reaction, CustomReaction, and Reply structs added to RCSMessage.

• RCSMessage.Content gains three new cases — reaction, customReaction, and reply — each carrying typed payloads including target message ID, operation (add/remove), and optional end-to-end encryption flags.
• RCSService adds a sendMessage(_:to:using:messageID:) method and an updated SendEncryptedMessageRequest initializer to support sending these new message types.

No developer-facing API changes — the only diff is an added internal os framework import.

New systemPrefersReducedResourceUsage trait and property let apps adapt when the system requests reduced resource consumption, and canOpenURL: is deprecated in favor of attempting opens and handling failures.

• Writing Tools gains grammar-checking support via new UIWritingToolsCoordinator delegate methods, grammarCheckingType on UITextInputTraits, and new animation/decoration enum cases for grammar presentation.
• Three new UITextContentType constants (IMEI1, IMEI2, NAL) are added for cellular device identifier autofill.

New write-capable attribute API lets you set and clear values on USDPrim.Attribute at a given time, and a new USDStage.exportPackage(options:) method adds stage-level package export.

UNError.Code.attachmentUnsupportedType (and its UNErrorCodeAttachmentUnsupportedType ObjC equivalent) has been removed with no replacement.

WKJSScriptingBuffer is removed as a type — its API is replaced by passing raw NSData directly to -addBuffer:name:contentWorld: on WKUserContentController.

• The Global Privacy Control property on WKWebpagePreferences is renamed from globalPrivacyControlEnabled to globalPrivacyControlStatus.
• The refreshController property on WKWebView (macOS) is marked macos(NA), withdrawing its previous macOS 27.0 availability.