What's new in Xcode 16?

Xcode 16 introduces several new features and improvements across various aspects of app development. Here are some of the key updates:

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 uses your project symbols to customize suggestions and runs locally on your Mac, ensuring privacy and fast results. This is available when running Xcode 16 on macOS Sequoia. What’s new in Xcode 16

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 Previews now use a new dynamic linking architecture that avoids rebuilding your project when switching between previews and builds, making the workflow smoother and more productive. Additionally, a new previewable macro allows dynamic properties like state to be used directly in a preview block. Platforms State of the Union

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. Swiftassist:

   • Swiftassist is a new companion for coding tasks, powered by a larger and more powerful model that runs in the cloud. It can answer coding questions and help with tasks like experimenting with new APIs. Platforms State of the Union

6. Debugging and Performance:

   • Xcode 16 introduces a single view of your backtraces showing relevant code from all stack frames together, a flame graph of your profiling data in Instruments, and enhancements to localization catalogs. Platforms State of the Union

7. Instruments:

   • The new flame graph in Instruments provides a visual way of seeing your call stacks, helping you find performance issues more effectively. What’s new in Xcode 16

For a detailed overview, you can watch the session What’s new in Xcode 16.