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Give your simulator superpowers

RocketSim: An Essential Developer Tool
as recommended by Apple

Issue 322
May 05, 2026

This week's SwiftLee Weekly covers:

  • Indirect enum cases in Swift
  • Unexpected Task suspension points slowing down your apps
  • 63% fewer tokens used to navigate the Simulator using Agents

Enjoy this week's SwiftLee Weekly!

THIS WEEK'S BLOG POST

​Unexpected Task suspension points in Swift Concurrency​

I'm using Swift Concurrency heavily in my apps, but I'm still learning every day. This time, I ran into an unexpected suspension point that seemed innocent, until I executed the related task many times in a short period. The mistake and solution are already merged into my Swift Concurrency Agent Skill, but I highly encourage you to understand the problem first yourself by reading this week's article.

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CURATED FROM THE COMMUNITY

​Scheduling and handling background app refresh in SwiftUI​

What if you could update your app’s data while it’s in the background, preparing for when the user comes back? You can follow Natalia Panferova’s technique using background tasks in SwiftUI.
​nilcoalescing.com​

​Understanding 'indirect' keyword in Swift - Recursive Enums Explained Clearly​

Have you ever used an indirect enum case in Swift? If not, you should read this article by Sagar Unagar for sure!
​sagarunagar.com​

​Synchronization in Swift: Actors vs Queues vs Locks → Livsy Code​

Do you prefer Actors, DispatchQueues, or locks like NSLock? Artem Mirzabekian explains how to choose in practice.
​livsycode.com​

​How to implement pagination with SwiftUI's List view​

Learn how to fetch an initial page of results and then load more content as the user scrolls using Natascha Fadeeva’s technique in SwiftUI.
​tanaschita.com​

​Six Years Perfecting Maps on watchOS​

This is a fantastic story by David Smith of optimizing his Pedometer++ watchOS app’s Map functionality.
​david-smith.org​

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.

WHAT I'M WORKING ON

iOS Konf and RocketSim 16.0

I'm writing this weekly issue from Skopje, Macedonia, while attending iOS Konf. It's an amazing conference so far, well-organized, and I can totally recommend going there next year.

Many talks cover AI-topics and it shows that we're shifting as a community to more AI-focused learnings. It's a great segue into what I've been cooking over the past weeks.

RocketSim's latest TestFlight introduced the first production-ready CLI and Agent Skill. It's trained on a collection of scenarios that I defined at the start, allowing me to compare it against popular tools in the space.

In our internal research, RocketSim’s CLI completed the same agent workflows about 19% faster, avoided wrong taps entirely, and used about 63% fewer estimated tokens than a popular alternative.

Obviously, it felt biased. So I was keen to get it in the hands of teams actually trying it out. Here's a quote of one of the early adopters:

I just tried and eeeee oh my god. it used almost noooo tokkkeeeens

I guess I'd love for you to try it out. The build is currently waiting for review, so either join the TestFlight or wait a few days. RocketSim is sandboxed and in the Mac App Store, which is a great way to get your company to allow using it and start using Agents to control the Simulator (See RocketSim for Teams).

Oh, and did I tell you that RocketSim now works with USB-connected devices?

UNTIL NEXT TIME

Continue your Swift development journey

I hope you've enjoyed this week's content. You don't have to wait till next Tuesday for more insights, I share every day on these channels:

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

Antoine

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