What is new in xcode 16

Xcode 16 introduces several exciting new features and improvements to enhance the app development process. Here are some of the highlights:

1. 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. This is available when running Xcode 16 on macOS Sequoia.

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

3. 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.

4. Previews: Previews in Xcode 16 are faster and more efficient, thanks to a new execution engine and dynamic linking architecture. This allows for a smoother workflow by avoiding the need to rebuild your project when switching between previews and builds.

5. 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 and is designed with privacy and security in mind.

6. Instruments and Debugging: Xcode 16 includes a flame graph for profiling data, providing deeper insights into app performance. It also features enhancements to localization catalogs and a single view of backtraces showing relevant code from all stack frames together.

For more detailed information, you can check out the session "What’s new in Xcode 16" or the "Platforms State of the Union" session.