Give your simulator superpowers

RocketSim: An Essential Developer Tool
as recommended by Apple

Issue 335
Aug 04, 2026

This week's SwiftLee Weekly covers:

  • An inspiring new iOS 27 framework
  • Revealing 2 new app icons
  • SwiftData syncing and testing

Enjoy this week's SwiftLee Weekly!

THIS WEEK'S BLOG POST

​@MainActor in Swift explained with code examples​

Crazy to believe I wrote the first version of this article in November 2024. Enough reason to revisit and update it for the latest state of today.
​avanderlee.com​

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CURATED FROM THE COMMUNITY

​iOS 27: Media Intelligence​

If you're looking for a new iOS app idea, this framework might be the inspiration you need. Anton Gubarenko shares the details.
​antongubarenko.substack.com​

​Avoiding Duplicate Data When SwiftData Syncs Across Devices​

Syncing SwiftData across devices using iCloud sync? This article series by Thorsten Stark will be useful.
​thorsten-stark.de​

​Swift protocols and the main actor​

How does it work when you add @MainActor to a protocol definition? John Sundell explains.
​swiftbysundell.com​

​Demystifying Thread Hopping with Swift 6.2 Approachable Concurrency​

Swift 6.2' Approachable Concurrency is here for a while now, but do you fully understand it? If not, you'll be happy with this article from Nikita Vasilev.
​nsvasilev.com​

​Building Testable SwiftData Apps​

You build an app using SwiftData, but how do you ensure good testability? Mohammad Azam's guidance can help you out.
​azamsharp.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.

WHAT I'M WORKING ON

Bringing the other two Rocket apps to life

I'm beyond excited to share with you the first impression of the two other apps we're currently working on. Or well, the app icons at least!

I can't share many details yet regarding the apps themselves (see previous issue), but I do love to invite you to:

  1. Open Xcode Instruments
  2. Select the Concurrency or SwiftUI template (or combine both, if you know how)
  3. Create a trace of a physical device (macOS works too, but no Simulator)
  4. Save the result as a .trace file
  5. Email me the file and what you hope to get improved

In return, I'll do my best to identify the most prominent issue in your app and present it in a way that's easy for you to fix. See it as a win-win: you help me build the best app possible, I help you improve the performance of your app!

​

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Antoine

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