Issues with Xcode 16

Issues with Xcode 16

Xcode 16 introduces several new features and improvements, but there are also some potential issues and areas to be aware of:

1. Concurrency Safety:

   • Xcode 16 introduces Swift 6, which brings concurrency safety guarantees. This can turn data races that were previously only experienced at runtime into compile-time issues. For example, the issues navigator will warn you about concurrency safety problems, such as global variables that are not concurrency safe (What’s new in Xcode 16).

2. Build Process:

   • Explicit modules are a new feature in Xcode 16 that improve parallelism and diagnostics. However, enabling explicit modules might cause build failures if there are module issues. These issues are reflected in the build timeline, making it easier to see where time is being spent and optimize builds (What’s new in Xcode 16).

3. Debugging:

   • The thread performance checker in Xcode 16 has been enhanced to show excessive disk write and slow app launch diagnostics. This can help you improve your app's performance but might also reveal new issues that need to be addressed (What’s new in Xcode 16).

4. Swift 6 Migration:

   • Migrating to Swift 6 involves enabling the new language mode, which brings full data isolation enforcement. This can reveal potential bugs in your code that need fixing, guided by the compiler diagnostics (Migrate your app to Swift 6).

5. Code Completion:

   • Xcode 16 features a new code completion engine powered by a model specifically trained for Swift and Apple SDKs. While this improves the accuracy and relevance of code suggestions, it might also require some adjustment if you are used to the previous behavior (Platforms State of the Union).

Relevant Sessions

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

For more detailed information, you can refer to the specific chapters and timestamps provided.