What's new in Xcode 16.2

Xcode 16.2 introduces several new features and improvements to enhance the development experience. Here are some highlights:

1. Code Completion: Xcode 16.2 features an innovative new engine for code completion, powered by a model specifically trained for Swift and Apple SDKs. This engine uses your project symbols to customize suggestions and runs locally on your Mac, ensuring privacy and fast results.

2. Swift 6: The new Swift 6 language mode provides concurrency safety guarantees, turning data races into compile-time issues, which improves the correctness and safety of your code.

3. Build System: Xcode 16.2 supercharges builds with explicit modules, offering improved parallelism, better diagnostics, and faster debugging. For C and Objective-C, explicit modules are on by default, while for Swift, you need to opt in.

4. Previews: There are improvements in UI previews, making them faster and more integrated with your model. New APIs like the previewable macro make previews simpler to write and more reusable.

5. Debugging and Diagnostics: The thread performance checker now shows excessive disk write and slow app launch diagnostics, helping you improve app performance. The organizer provides a new category of diagnostic logs for app launches.

6. Instruments: Xcode 16.2 introduces flame graphs for visualizing call stacks, which is a great way to find performance issues.

7. StoreKit Enhancements: Updates to StoreKit configuration allow you to test your app's privacy policy and license agreement locally, and test localizations for your subscription groups' display names.

For more detailed information, you can refer to the session What’s new in Xcode 16.