Antoine v.d. SwiftLee  (@avanderlee.com)

19.02.2026 14:59 👍 0 🔁 0 💬 0 📌 0

Agentic Coding in Xcode with Gemini CLI Learn how to use Gemini CLI for agentic coding in Xcode 26.3 via the MCP bridge. This post covers setup, configuration, and a practical example of building an emoji physics playground.

19.02.2026 14:01 👍 4 🔁 0 💬 0 📌 0

Automating Codex You‘re one step away from turning Codex into a proactive assistant that tackles low-hanging fruit while you sleep.

19.02.2026 12:56 👍 1 🔁 0 💬 0 📌 0

If You Are Not Versioning Your Swiftdata Schema If You’re Not Versioning Your SwiftData Schema, You’re Gambling

19.02.2026 11:25 👍 6 🔁 1 💬 1 📌 1

19.02.2026 09:34 👍 1 🔁 0 💬 0 📌 0

Do you know whether your Xcode project's build time became faster or slower this year?

If you've used RocketSim's build insights, you would know!

11.01.2026 16:24 👍 3 🔁 0 💬 1 📌 0

I'm offering 1-on-1 coaching sessions to help you achieve your goals.

Find out more: https://newsletter.avanderlee.com/1on1

09.01.2026 11:29 👍 1 🔁 0 💬 0 📌 0

Intercepting SwiftUI Sheet Dismissal → Livsy Code Greetings, traveler! SwiftUI sheets are great until you need one specific behavior: react when the user tries to dismiss the sheet interactively. You can disable interactive dismissal with .interactiveDismissDisabled(), and you can provide a “Done” button, but there’s still a common UX gap: the user drags the sheet down, expects it to close, and you

08.01.2026 16:53 👍 2 🔁 0 💬 0 📌 0

Icon Composer: Transforming an AI-generated icon Get tips on using Icon Composer to generate polished app icons, with insights from industry expert Michael Flarup.

Learn how Icon Composer can impact your icon design

🤖 From AI to Icon Composer
🫢 My embarrassing AI-generated icon
✨ Polished end result

https://www.avanderlee.com/workflow/icon-composer-transforming-an-ai-generated-icon/

08.01.2026 14:48 👍 0 🔁 0 💬 0 📌 0

Replay Fast, reliable API tests without mocks or stale JSON fixtures. Replay records real HTTP traffic once (as HAR) and replays it instantly with Swift Testing so your networking code stays honest and your test suite stays fast.

08.01.2026 12:25 👍 1 🔁 0 💬 0 📌 0

Have LLMs improved for Swift coding in the last 12 months? A small followup, 12 months after the previous article, looking at the improvements in different LLMs for Swift development

08.01.2026 11:11 👍 2 🔁 1 💬 0 📌 0

08.01.2026 09:59 👍 0 🔁 0 💬 1 📌 0

GitHub - Dimillian/Skills: My Codex Skills My Codex Skills. Contribute to Dimillian/Skills development by creating an account on GitHub.

08.01.2026 09:16 👍 3 🔁 0 💬 1 📌 1

My custom ChatGPT project knew all my app details, so I asked it to generate an app icon that went well with it.

I was pretty impressed at first, until I received the app icon design from a pro designer 🙈

https://www.avanderlee.com/workflow/icon-composer-transforming-an-ai-generated-icon/

06.01.2026 14:08 👍 4 🔁 1 💬 0 📌 0

Icon Composer: Transforming an AI-generated icon Get tips on using Icon Composer to generate polished app icons, with insights from industry expert Michael Flarup.

Learn how Icon Composer can impact your icon design

🤖 From AI to Icon Composer
🫢 My embarrassing AI-generated icon
✨ Polished end result

https://www.avanderlee.com/workflow/icon-composer-transforming-an-ai-generated-icon/

05.01.2026 13:42 👍 1 🔁 0 💬 0 📌 0

I've been developing apps since 2009, and I'm now offering free 1-on-1 career advice sessions.

Find out more here: https://newsletter.avanderlee.com/1on1

02.01.2026 19:43 👍 2 🔁 2 💬 0 📌 0

Learn by shipping 🚢

Some would say it's crazy — I would say it's a must for side projects.

Find out why: https://slides.going-indie.com/

02.01.2026 11:06 👍 2 🔁 0 💬 0 📌 0

SwiftLee in 2025: A full year as an indie developer Reflecting on SwiftLee 2025: milestones, independence, and a transformed approach to app development.

It's time to reflect on 2025!

🎯 Milestones and achievements
🚀 RocketSim's Success
🔮 A look into 2026

https://www.avanderlee.com/general/swiftlee-in-2025-a-full-year-as-an-indie-developer/

01.01.2026 16:34 👍 5 🔁 1 💬 0 📌 0

AI (Without the Hype) I spoke at NSSpain this year and gave a wide-ranging talk AI, building from the fundamentals to real-world uses — with something for everyone.

01.01.2026 14:33 👍 1 🔁 1 💬 0 📌 0

01.01.2026 12:52 👍 0 🔁 0 💬 0 📌 0

Shipping at Inference-Speed | Peter Steinberger Why I stopped reading code and started watching it stream by.

01.01.2026 11:56 👍 0 🔁 0 💬 0 📌 0

How to Find a Winning App Idea (Before You Waste Months Building the Wrong One) Before you build your next app, make sure the idea can actually make money. In this episode, I break down the exact framework I use to validate profitable app ideas — long before writing any code. You’ll learn how to avoid wasting months on the wrong app idea and how to use AI, ASO tools, and market research to discover ideas with real potential. If you’re trying to go indie, hit your first 1K MRR, or build an app that grows into a business, this process will completely change how you think about “good” app ideas. WHAT YOU'LL LEARN - How to find app ideas that make money - My 8-step checklist for validating any app idea - How to test demand using ASO tools like AppFigures - How AI becomes a powerful app-idea sparring partner - Why passion & competence matter more than you think - Real examples: The two ideas I'm considering - How to match your skills with a big enough market - Why most developers quit too early — and how to avoid it CHAPTERS 0:00 – Why most developers pick the wrong app idea 0:23 – The 8 rules for a profitable app idea 3:39 – Monetization paths that actually work 4:35 – Why copying existing apps will get you rejected 5:49 – Using your audience as a competitive advantage 6:01 – Where good app ideas actually come from 7:01 – AI as your brainstorming partner 8:03 – Turning inspiration into real evaluation 10:35 – Mapping your skills & interests 12:05 – App Idea #1 13:02 – App Idea #2 14:04 – Validating ideas using ChatGPT 18:03 – Validating ideas using ASO tools 22:48 – Does a LinkedIn app idea make sense? 23:23 – Why the YouTube idea might have bigger potential 26:11 – The role of passion (and why most developers quit) 27:27 – A real example: RocketSim’s slow early growth 28:27 – Learn by shipping 28:44 – Summary & what’s next DON'T MISS OUT ON THE JOURNEY If you enjoyed this, Like & Subscribe! I’m documenting the entire journey of building a new indie app from scratch — idea to 10K MRR. Subscribe so you don’t miss the next episode where I reveal which app idea I’ll build. #appideas #profitableappideas #appideastomakemoney #buildinpublic #indiedeveloper #swiftdevelopment #iosdevelopment #swiftui #swiftlanguage

01.01.2026 11:10 👍 1 🔁 0 💬 0 📌 0

Explicit Dependency Injection → Livsy Code Greetings, traveler! When an application is small, dependency injection rarely feels like a problem. Dependencies are simply passed through initializers, and the system remains easy to understand. There is little need for special patterns or tooling, and the code naturally reflects how the application is composed. As the codebase grows, this simplicity often disappears. New

01.01.2026 09:18 👍 0 🔁 0 💬 0 📌 0

A personal milestone for me in 2025 was the week of WWDC.

Meeting so many great developers from the community, as well as presenting RocketSim at the Meta headquarters.

What's your highlight of the year 2025?

https://www.avanderlee.com/general/swiftlee-in-2025-a-full-year-as-an-indie-developer/

30.12.2025 12:47 👍 5 🔁 0 💬 1 📌 0

SwiftLee in 2025: A full year as an indie developer Reflecting on SwiftLee 2025: milestones, independence, and a transformed approach to app development.

It's time to reflect on 2025!

🎯 Milestones and achievements
🚀 RocketSim's Success
🔮 A look into 2026

https://www.avanderlee.com/general/swiftlee-in-2025-a-full-year-as-an-indie-developer/

29.12.2025 12:51 👍 1 🔁 0 💬 0 📌 0

Stretchable Header in SwiftUI for Vertical and Horizontal ScrollView → Livsy Code Greetings, traveler! Stretchy headers and elastic overscroll effects have become a familiar part of modern iOS interfaces. They add visual feedback, reinforce the scroll direction, and make content feel more responsive and alive. With newer APIs, the platform now offers a clean solution — and with the right abstraction, the same behavior can be made

28.12.2025 12:58 👍 1 🔁 0 💬 0 📌 0

GitHub - christopherkarani/SwiftAgents: Langchain but for swift 🐦‍🔥 Langchain but for swift 🐦‍🔥. Contribute to christopherkarani/SwiftAgents development by creating an account on GitHub.

28.12.2025 07:47 👍 1 🔁 0 💬 1 📌 0

How I use Codex GPT 5.2 with Xcode (My Complete Workflow) 3 workflow tips to keep your iOS/macOS builds green ✅. Your agent needs to have eyes to see what is happening in your app to be productive. 1. Build Scripts 2. Make Build Failures Obvious 3. Give Your Agent Eyes LINKS 1. Peekaboo (agent "eyes"): https://github.com/steipete/Peekaboo 2. xcbeautify (structured xcodebuild output): https://github.com/cpisciotta/xcbeautify 3. AXe — iOS Simulator automation via Apple Accessibility APIs: https://github.com/cameroncooke/AXe 0:00 Why Agents Miss Errors 1:21 Makefile Build Script 6:55 Make Build Failures Obvious 8:53 xcbeautify 10:22 Give Your Agent Eyes 11:14 Peekaboo 13:22 AXe - iOS Simulator Testing 14:22 align CLI 30:17 Debug Snapshot 38:14 Profiling Performance Issues (Instruments) 44:36 Recap & Key Takeaways 45:52 Agent Check-in Need help? https://super-easy-apps.kit.com/community #Codex #Xcode #GPT52 #CodexGPT5 #CodexGPT52 #Xcode #iOSDev #macOSDev #SwiftUI #xcodebuild #xcbeautify #Makefile #AIcoding #OpenAI #iOS #macOS

27.12.2025 16:38 👍 2 🔁 0 💬 0 📌 0

Stop Getting Average Code from Your LLM | Krzysztof Zabłocki Most developers use LLMs straight out of the box and wonder why the code looks nothing like production. Here's how to teach them your style...

27.12.2025 10:35 👍 5 🔁 1 💬 0 📌 0

From App Idea to 10K MRR - YouTube Series Learn how to transform your app idea into a successful project while reaching 10K Monthly Recurring Revenue.

I'm building a new app! And that's been a while 🙈

💸 Trying to reach 10K MRR
🎥 Documenting everything
🤝 A real development journey

https://www.avanderlee.com/workflow/from-app-idea-to-10k-mrr-youtube-series/

26.12.2025 12:17 👍 5 🔁 1 💬 0 📌 0

Antoine v.d. SwiftLee 

Latest posts by Antoine v.d. SwiftLee  @avanderlee.com