What is new in Xcode 16?

Xcode 16 introduces several new features and improvements to enhance the app development process:

Code Completion: Xcode 16 features an innovative new engine for code completion, powered by a model specifically trained for Swift and Apple SDKs. This engine predicts the code you need by using your project symbols to customize suggestions, and it runs locally on your Mac, ensuring privacy and fast results.
Swift 6: A new language mode in Swift 6 provides concurrency safety guarantees, turning data races into compile-time issues, which improves code correctness and safety.
Build Improvements: Xcode 16 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.
Previews: Xcode Previews now have a new dynamic linking architecture that uses the same build artifacts for previews and when you build and run, avoiding the need to rebuild your project when switching between the two. This results in a smoother workflow.
Swiftassist: A new companion tool, Swiftassist, helps with coding tasks by answering questions and assisting with experimenting with new APIs. It runs in the cloud but ensures that your code remains private.
Instruments and Profiling: Xcode 16 introduces a flame graph for profiling data, providing deeper insights into app performance. This visual tool helps identify performance issues more effectively.
Localization and Debugging: Enhancements to localization workflows and debugging tools are also part of Xcode 16, making it easier to bring apps to a global audience and improve app quality.

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