Give your simulator superpowers

RocketSim: An Essential Developer Tool
as recommended by Apple

Issue 283
Aug 05, 2025

This week's SwiftLee Weekly covers:

  • My favorite open-sourced Apple frameworks
  • The biggest benefit of Going Indie
  • A special "I'm on a holiday" edition

Enjoy this week's SwiftLee Weekly!

THIS WEEK'S BLOG POST

​Global actor in Swift Concurrency explained with code examples​

The @MainActor is probably well-known and it's an example of a global actor. But how and when should you use a custom global actor?

That's explained in this week's article, including a common risk when defining one.

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CURATED FROM GITHUB

“
Prepare for a special edition of this curated section. Since I'm writing this newsletter in preparation for my holiday, I had to curate in advance. Here's a list of my favorite open-sourced repositories by Apple!

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

If you’re used to working with NSProcess or building Mac apps, you’ll enjoy this package as much as I do for RocketSim.
​github.com​

​swiftlang/swift-testing: A modern, expressive testing package for Swift​

We know Swift is open-sourced, maybe you know about swift-package-manager too, but did you know Swift Testing is open-sourced as well?
​github.com​

​swiftlang/swiftly: A Swift toolchain installer and manager, written in Swift.​

It was hard to skip this one just because of the name. But honestly, it’s been a great solution for installing toolchains and testing upcoming Swift features!
​github.com​

​apple/swift-async-algorithms: Async Algorithms for Swift​

You won’t be surprised by this one. I’ve mentioned this repo several times in my concurrency course as they fill a gap in the standard library!
​github.com​

​apple/swift-collections: Commonly used data structures for Swift​

There are types you expect to exist in the standard library, but you end up with their NS- variant. For example, NSOrderedSet. This package might be your way out!
​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.

It's still quiet, no changes this week!

CODE SNIPPET OF THE WEEK I MEAN WHAT I'M WORKING ON I'm ON A HOLIDAY

A benefit of Going Indie

While I'm on a holiday, I figured it would make sense to share a different code snippet of the week. It's one of the biggest wins for me after going indie: family time.

Many Indie developers share benefits like:

  • Working on your own apps only
  • Flexible time
  • Work from anywhere

But I know many of them also enjoy much more time with the family. I won't say I'm less busy as an indie, but I'm always around my two kids. I don't have to commute to work and I can often quit the day early and make up for that time in the evening if needed.

I'm writing this email the day before we leave for a 1-week holiday. That's also why you've found some other curated links this time! Yet, I hope you've enjoyed this edition.

P.s., if you seek to go indie, I bundled all the learnings from my journey in a dedicated course at www.going-indie.com.

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Antoine v.d. SwiftLee 
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@twannl
8:44 PM • Jul 31, 2025
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Thank you so much for your support, and until next Tuesday,

Antoine

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