Give your simulator superpowers

RocketSim: An Essential Developer Tool
as recommended by Apple

Issue 303
Dec 23, 2025

This week's SwiftLee Weekly covers:

  • SwiftAgents
  • Giving your agents eyes
  • Stretchable headers in SwiftUI

Enjoy this week's SwiftLee Weekly!

THIS WEEK'S BLOG POST

​From App Idea to 10K MRR – YouTube Series​

How do you know whether you're building the right app idea? Which decisions do you need to make to get it to 10K Monthly Recurring Revenue (MRR)?

That's exactly what I'm going to show in this new YouTube series.

SPONSORED

​RocketSim: Build iOS apps up to 2x faster with enhanced Xcode Simulator tools​

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CURATED FROM THE COMMUNITY

​SwiftAgents: Langchain but for swift​

If you’re looking for a comprehensive Swift framework for building autonomous AI agents, this is the one worth checking out. The framework offers a lot, but that flexibility might be just what you need.
​github.com​

​How I use Codex GPT 5.2 with Xcode (My complete workflow)​

If you’ve been using Cursor, or any AI tool, I’m sure you’ve been running into compiler issues. How do you give your agents eyes?
​youtube.com​

​Stop Getting Average Code from Your LLM | Krzysztof Zabłocki​

The developers that know how to improve AI generated code quality will win in the end. I love this approach by Krzysztof Zabłocki that’s worth trying yourself!
​merowing.info​

​Non-Sendable First Design​

Non-Sendable types are more common in Swift Concurrency after the introduction of Approachable Concurrency, and Matt explains why this might be a reason not to need @MainActor everywhere.
​massicotte.org​

​Stretchable Header in SwiftUI for Vertical and Horizontal ScrollView → Livsy Code​

A stretchable header in SwiftUI that works on iOS 13 and above. Artem Mirzabekian shares how it works!
​livsycode.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

Adjusted pricing for the Swift Concurrency Course

Thank you all so much for submitting your input for my pricing research last week. It was pretty clear that I could do a better job, so I acted accordingly.

I devided countries based on low, mid, and high income and adjust the pricing fairly accordingly. You can simply go to swiftconcurrencycourse.com and the pricing will apply.

This week I've been deep into the YouTube Series for my new app idea. I've developed the first iOS version, created an app icon with Michael Flarup (episode following next week!), and slowly but surely getting closer to a first beta build.

It's also holiday season, so I'm leaving this as a short summary. Enjoy your holidays!

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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