Xcode 16 | Ask WWDC

Xcode 16 introduces several new features and improvements aimed at enhancing the development experience. Here are some key highlights:

Generative Models and Code Completion:
- Xcode 16 leverages generative models to improve code completion. The new engine predicts the code you need, using a model specifically trained for Swift and Apple SDKs. It customizes suggestions based on your project symbols and runs locally on your Mac, ensuring privacy and fast results. This feature is available when running Xcode 16 on macOS Sequoia.
- Platforms State of the Union
- What’s new in Xcode 16
Swift 6 Integration:
- Swift 6 introduces a new language mode that provides concurrency safety guarantees, turning data races into compile-time issues. This improves the correctness and safety of your code.
- What’s new in Xcode 16
- Migrate your app to Swift 6
Previews and Builds:
- Previews in Xcode 16 are faster than ever, thanks to advances in the compiler and build system. Explicit modules provide improved parallelism, better diagnostics, and faster debugging.
- What’s new in Xcode 16
Swiftassist:
- Swiftassist is a new feature that acts as a companion for all your coding tasks. It can answer coding questions and help with tasks like experimenting with new APIs.
- Platforms State of the Union
Instruments and Flame Graphs:
- Xcode 16 includes a flame graph feature in Instruments, providing a visual way to see your call stacks and gain deeper insights into your app's performance.
- What’s new in Xcode 16
Localization and Other Enhancements:
- Enhancements to localization catalogs make it easier to bring your app to more people around the world. Other improvements include a single view of your backtraces and a hardened C runtime.
- Platforms State of the Union

For a detailed overview, you can watch the sessions:

Relevant Sessions

Platforms State of the Union
What’s new in Xcode 16
Migrate your app to Swift 6