what is new in Preview xcode 16

In Xcode 16, several new features and improvements have been introduced, particularly in the area of previews. Here are some of the key updates:

1. Dynamic Linking Architecture: Xcode Previews now use a new dynamic linking architecture that utilizes the same build artifacts for both previews and when you build and run your project. This change eliminates the need to rebuild your project when switching between the two, resulting in a smoother and more productive workflow.

2. Previewable Macro: A new previewable macro allows you to use dynamic properties like state directly in an Xcode preview, reducing the amount of code you need to write.

3. Faster Previews: Previews are now faster than ever, thanks to advances in the compiler, build system, and operating systems. This improvement is powered by a new execution engine that reassembles your program on the fly without needing to produce a separate copy.

4. Code Completion: Xcode 16 introduces a new code completion engine that provides more thorough suggestions by using an on-device coding model specifically trained for Swift and Apple SDKs. This engine runs locally on your Mac, ensuring privacy and fast results.

5. Swiftassist: A new feature called Swiftassist acts as a companion for coding tasks, leveraging a larger and more powerful model that runs in the cloud to assist with coding.

For more detailed information, you can refer to the session What’s new in Xcode 16 (02:49) which covers improvements to previews.