iOS 27.2 beta 4: release date and what’s new for developers

The biggest change in the iOS 27.2 release notes is in App Tracking Transparency. The framework now supports an alternative expanded prompt and re-prompting once a year for users in the EU. Apple says the alternative prompt is required for users in France, Germany, Italy, Poland and Romania. The new request API has been renamed twice during the beta. In beta 4 the Objective-C method is requestTrackingAuthorizationPreferringExpandedInterface:, after earlier forms with usingExpandedInterface: and preferExpandedInterface:, so code written against beta 2 or 3 will not compile until you update the call. If your app tracks, test the prompt flow on beta 4 with those regions. The basics of the prompt are in our App Tracking Transparency guide.

A UIKit change that can shift layouts quietly: on iOS 27.1 and later, the default layout margins for a UIView are zero. A view controller still gives its own view systemMinimumLayoutMargins, which depend on the presentation context. A subview that relied on default margins should set preservesSuperviewLayoutMargins to true to inherit them. Check screens that pin content to layout margins rather than to the safe area or explicit constants.

Xcode 27.2 beta 2 includes Swift 6.4 and the 27.2 SDKs, supports on-device debugging on iOS 17 and later, and needs a Mac running macOS Tahoe 26.6 or later. It adds a JSON-based project format, .xcproj, which Apple describes as more readable, merge-friendly and easier for coding agents to edit. You turn it on in the File inspector, and such projects also open in earlier versions of Xcode 27. The coding assistant gains a GetCodeCoverage MCP tool that reports coverage from the latest test result, and the RenderPreview tool can now list and pick render destinations. Device Hub gets several input fixes, including support for iOS 17 simulators. For wiring agents into Xcode, see Xcode’s MCP server and Device Hub.

Apple lists a few issues that are easy to mistake for your own bugs. Cloning a simulator device on runtime 27.2 can fail because of file permissions. Apple’s workaround deletes the stray sandbox files inside the source device’s data folder, and the exact command is in the iOS 27.2 release notes. On iPhone Duo, screenshots and recordings may be black for a few minutes after booting. In Xcode 27.2, the macOS, watchOS, tvOS and visionOS SDKs wrongly offer 27.1 as a deployment target, which can cause unexpected behavior. Projects using iOS 27.1 APIs may not compile for Mac Catalyst, and Apple suggests isolating that code with #if !targetEnvironment(macCatalyst). For StoreKit testing, three SKTestSession bugs are fixed, while buying a subscription that is part of a bundle can wrongly unbundle it. Beta 4 also lists user-facing issues your testers may report: Describe a Shortcut can fail with “Something went wrong”, and personalized summaries may not generate in the Health Insights tab.

Betas are for testing, not for App Store submissions. Xcode 27.1 reached release candidate on October 5, 2026 with the iOS 27.1 SDK, and Apple asks developers to recompile with it for iPhone Duo; see our iPhone Duo guide. For what changed at iOS 27 itself, read the UIScene lifecycle requirement.

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