iOS 27 integrates heart rate and cycling power zone tracking directly into HealthKit, automatically calculating time spent in each intensity zone during workouts and delivering live zone-change updates to your app.
ā¢ Apps can now retrieve structured zone duration data from completed workouts without manually binning samples ā HealthKit does the math automatically.
ā¢ Live delegate callbacks fire whenever the user crosses a zone boundary mid-workout, enabling real-time coaching UI with zero polling.
ā¢ Zone configurations sync across devices via HealthKit, and apps can supply custom zone thresholds (e.g. a 7-zone power model) before collection begins.
USDKit is a new first-party Swift framework introduced in iOS/macOS 27 that brings native USD scene creation, composition, modification, and export capabilities to Apple platform apps, with deep RealityKit and Spatial Preview integration.
iOS 27 adds sectioned queries, codable model attributes, ResultsObserver for non-SwiftUI change observation, and HistoryObserver for reacting to persistent history changes in SwiftData.
Xcode 27 introduces an agentic localization workflow that lets you ask a coding agent to translate your entire app directly inside Xcode, leveraging String Catalog context ā including where and how strings are used ā to produce accurate, consistent translations across all languages.
iOS 27 expands the App Intents framework with RelevantEntities for contextual content surfacing, EntityCollection for high-performance batch parameter handling, SyncableEntity for cross-device Siri continuity, native Duration/PersonNameComponents parameter types, and @UnionValue for multi-type parameters ā plus extended intent execution time limits.