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Issue 268
Apr 22, 2025

This week's SwiftLee Weekly covers:

  • A first look at Swift 6.2
  • A code deprecation coming in iOS 19
  • Create MCP Servers in Swift

Enjoy this week's SwiftLee Weekly!

THIS WEEK'S BLOG POST

​Swift 6.2: A first look at how it’s changing Concurrency​

I'm currently preparing my Deep Dish Swift conference talk and diving deep into what's next for Swift Concurrency. Since Swift is open-source, we have the opportunity to look at the latest changes that are coming up next. A few of those relate to a new vision document on Swift Concurrency and in this week's article, I'm giving you a first look at what's coming up.

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CURATED FROM THE COMMUNITY

​UIApplication delegate deprecation coming in iOS 19 SDK​

While a deprecation does not mean you can’t use it anymore, it’s likely UIApplicationDelegate will get deprecated in iOS 19!
​lapcatsoftware.com​

​Advice to My Younger Self​

If there’s one way to learn fast, it’s by reading distilled lessons from those with years of experience. Tjeerd in 't Veen shares insights from 25 years of development—you’re bound to walk away with something valuable.
​mobilesystemdesign.com​

​Creating MCP Servers in Swift​

​Artem Novichkov demonstrates how to build a simple Model Context Protocol (MCP) server in Swift that returns the current Swift version. This article is a must-read if you’re interested in coding with apps like Cursor AI. He walks through setting up the project, integrating the MCP SDK, and implementing a tool that responds with the Swift version.
​artemnovichkov.com​

​Using Swift’s defer keyword within async and throwing contexts​

The defer keyword is one of my favorite ways to clean up resource management in functions with multiple exit points. John Sundell discusses its usage, as well as within async contexts.
​swiftbysundell.com​

​swiftlang/swift-subprocess: Subprocess is a cross-platform package for spawning processes in Swift.​

I’m slowly adopting Swift 6 throughout my projects to build up migration experience for my concurrency course. Projects like this one from the Swift team are highly inspiring, and I can’t wait to implement it to replace my old NSProcess code!
​github.com​

SWIFT EVOLUTION

An overview of last week's Swift Proposal state changes. Check them out when they're in review, as it's your opportunity to influence the direction of Swift's future.

CODE SNIPPET OF THE WEEK

Upcoming Threading changes in Swift 6.2

You can find this post on Twitter/X, LinkedIn, or Bluesky.

QUESTION OF THE WEEK

“
Can I already see what's actively being developed into the next version of Swift?

It turns out you can!

Swift is open-sourced and that allows you to follow what's coming up next. At this moment, there's a release/6.2 branch in which new changes are actively pushed.

It's active development, so there's no guarantee it's in a state of release at anytime. However, if you follow the weekly proposals updates shared in this newsletter, you should have a good idea of what's coming up next.

If you like, you can even checkout the repository locally, create a one-off toolchain, and use it in Xcode accordingly. This is a way to try out new features before they go live. This process is well-documented with a starting point in the repository's readme.

In fact, it's what I've been doing for this week's code snippet and for my Swift Concurrency Course. I need to know what's coming up next to prevent writing content that's outdated before it even reaches your inbox. This also shows my goal for you—I'll do the hard work to digest all changes and boil it down into this newsletter's content so you stay current without spending much time. Enjoy!

Want to have your question answered next week? Ask your question via this form (anonymously) or reply to this email with your question.

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Thank you so much for your support, and until next Tuesday,

Antoine

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