New in Xcode 16?

Xcode 16 introduces several new features and improvements to enhance the development experience. Here are some of the key updates:

1. Code Completion:

   • Xcode 16 features a new code completion engine powered by an on-device coding model specifically trained for Swift and Apple SDKs. This engine uses the surrounding code context to provide more thorough suggestions, helping you move through your ideas faster. This feature is available when running Xcode 16 on macOS Sequoia.
   • Additionally, a larger and more powerful model called Swiftassist runs in the cloud, providing a companion for all your coding tasks, including answering coding questions and helping with tasks like experimenting with new APIs. Platforms State of the Union

2. Swift 6:

   • Swift 6 introduces a new language mode that provides concurrency safety guarantees, turning data races into compile-time issues. This helps improve the correctness and safety of your code. What’s new in Xcode 16

3. Previews:

   • Xcode 16 has improved previews, making them faster and more efficient. The new dynamic linking architecture 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 and more productive workflow. Platforms State of the Union
   • New APIs like the previewable macro make previews simpler to write, more reusable, and better integrated with your model. What’s new in Xcode 16

4. Builds:

   • Xcode 16 supercharges builds with explicit modules, providing improved parallelism, better diagnostics, and faster debugging without changing a single line of code. For C and Objective-C, explicit modules are on by default, while for Swift, you need to opt-in. What’s new in Xcode 16

5. Debugging and Performance:

   • Xcode 16 introduces a single view of your backtraces, showing relevant code from all stack frames together, and a flame graph of your profiling data in Instruments, giving you deeper insight into your app's performance. Platforms State of the Union
   • The flame graph is a visual way of seeing your call stacks, helping you find issues and improve performance. What’s new in Xcode 16

6. Localization:

   • Enhancements to localization catalogs make it easier to bring your app to more people around the world. Platforms State of the Union

For a detailed overview of all the new features and improvements, you can watch the full session on What’s new in Xcode 16.