Give your simulator superpowers

RocketSim: An Essential Developer Tool
as recommended by Apple

Issue 312
Feb 24, 2026

This week's SwiftLee Weekly covers:

  • A new VoiceOver Navigator tool for Xcode
  • Tracking token usage in Foundation Models
  • Two SwiftUI animation articles

Enjoy this week's SwiftLee Weekly!

THIS WEEK'S BLOG POST

​VoiceOver Navigator & 120 FPS Recordings for Xcode’s Simulator​

If you wonder what I've been cooking over the past weeks, you'll know now after reading this week's article. 120 Frames per seconds recordings, a VoiceOver Overlay & Navigator, and Networking insights are three major new features inside RocketSim 15.

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CURATED FROM THE COMMUNITY

​Tracking token usage in Foundation Models​

New since iOS 26.4 is the ability to track token usage for Apple’s Foundation Models. Artem Novichkov tells you more about it.
​artemnovichkov.com​

​Why Your @Observable Class init() Runs Multiple Times in SwiftUI​

Knowing how SwiftUI works behind the scenes helps you write more optimized views. This article by Artem Mirzabekian focus on details around the @Observable macro.
​livsycode.com​

​The 4-Step Process I Use to Create SwiftUI Animations​

How do you approach SwiftUI animations? If you don’t have a process, this 4-step sequence by Omar Elsayed might work.
​swiftdifferently.com​

​Testing with Event Streams​

The edge cases of migrating from XCTest to Swift Testing might be solved with the tips from Matt based on hands-on experience.
​massicotte.org​

​Isolate SwiftUI animations to specific attributes​

Preventing unintended animations in SwiftUI can be challenging, but with the tips from Natalia Panferova, you’ll have more tools to solve them more quickly.
​nilcoalescing.com​

WHAT I'M WORKING ON

I made a mistake and I want to be honest about it

As you might know, I released a SwiftUI Agent Skill not long ago, but I did something wrong that I want to be honest about.

When building the skill, I used Paul Hudson's SwiftAgents AGENTS.md as input for several of the SwiftUI guidelines. Paul put a lot of time and care into curating those SwiftUI guidelines, and I failed to give him proper credit. No attribution, no acknowledgment.

That's on me, and it was wrong. I value Paul and I value what he does for our community. I've added proper acknowledgments to the repository, and I'd encourage you to check out his SwiftAgents repo and the article it's based on. Attribution matters, especially in a community as close and small as ours. I should have done better from the start.

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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