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 — including where and how strings are used — to produce accurate, consistent translations across all languages.
• Eliminates the manual export/import cycle: agents build your targets, discover all localizable strings, add them to String Catalogs, and write translations in one conversation
• Context-aware translation uses String Catalog metadata (code location, usage comments, related strings, sibling-language translations) to disambiguate words like 'book' that have multiple meanings
• Consistent terminology is enforced automatically — a custom glossary or TRANSLATION.md file lets you lock product names, tone, and preferred terms across every language without re-prompting
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.
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 — plus extended intent execution time limits.
Swift 6.3 and 6.4 introduce a range of language and library improvements including anyAppleOS availability syntax, module selectors for disambiguation, task cancellation shielding, improved Swift Testing interoperability with XCTest, and a new Foundation ProgressManager type.