Those Who Swift - Issue 257
Weekly note ✏️Today we published the 18th issue of Indie App Devs. Indie iOS developer Danijela Vrzan shares her tips on how to decide which features are worth adding to your app and which ones to leave out. It’s a great issue, and you can read it here.📍 But that’s not the main story. I connected with her on LinkedIn, and this is what our chat looked like:
I’ve never properly introduced myself, so maybe now is a good time!
I run a few newsletters:
I make money with all of them, and together they generate around €50,000 in profit per year. I share more about this in this article - How to Make Money With Newsletter? So, it’s nice to meet you, and thank you for your support and for reading the newsletters! 👋 Connect with the "Those Who Swift" team - Justas Markus & Anton Gubarenko 👋
Speed Hacks for iOS BuildsGet this FREE guide to cut CI time and boost reliability. Learn caching strategies, parallel build tips, and modular architecture tactics to speed up iteration and keep iOS builds running smoothly. Swift Around the Web 🌐Why I'm Still Thinking About Core Data In 2026Fatbobman examines why developers stick with Core Data, citing mature capabilities, existing projects, and its object graph design. He notes growing mismatches with modern Swift in expressiveness, concurrency, and type safety, and argues experience-based workarounds are unsustainable. Swift At Scale: Building The TelemetryDeck Analytics ServiceDaniel Jilg explains how his company built a privacy-first analytics platform handling 16 million monthly users entirely on Swift with Vapor. Swift's compiled nature, Codable protocol, and Xcode development delivered unexpected advantages: catching errors at compile time, preventing security vulnerabilities through type safety, and enabling rapid iteration without containers. Coding 👨💻Get Rid Of Your SwiftGen DependencyAsser Osama explains that Xcode's built-in symbol generation for String Catalogs and asset catalogs now eliminates the need for SwiftGen in many projects by automatically creating type-safe Swift symbols with full compiler validation. Exploring Draw Effects And Gradient Rendering In SF SymbolsGabriel Theodoropoulos explores new SF Symbols 7 features in iOS 26, including Other cool stuff 🧰MVVM and the Cost of Carrying Old Patterns ForwardMohammad Azam explains that while MVVM was a valuable pattern for WPF and earlier frameworks, applying it rigidly in SwiftUI often leads to unnecessary complexity because Apple designed SwiftUI for state and logic to live close to the view. What AI Coding Costs YouTom Wojcik argues AI coding tools carry hidden costs: cognitive atrophy, loss of deep understanding, and a broken seniority pipeline. Citing a 2026 study where AI-assisted developers scored 17% lower on conceptual tests, he warns that reviewing AI code doesn't build hands-on intuition. AI 🤖How My Software Engineering Workflow Has Changed In The Past YearBruno Rocha describes how he does 95% of his work by prompting Claude, letting AI handle complex multi-codebase tasks alone at unprecedented speed. But he worries this efficiency removes the problem-solving joy and deep learning that drew him to engineering, and questions how future AI will train without human-made content. Codex Security: Now In Research PreviewOpenAI introduces Codex Security, an AI agent that finds complex vulnerabilities by understanding project context while reducing noise by over 84% and false positives by more than 50%. It helped discover and patch 14 CVEs in open-source projects like OpenSSH and Chromium, and is now available free for the next month to ChatGPT Enterprise, Business, and Edu customers. GPT-5.4: Now AvailableOpenAI released GPT-5.4, its most capable model yet, integrating advanced coding with native computer use and 1M token context. It achieves 83% in knowledge work tests, surpasses humans in computer use benchmarks, and reduces token consumption by 47% through tool search. Tutorials 📒Creating Overlays On A Map In A SwiftUI App In iOS 26The article explains how to add polygon, polyline, and circle overlays to maps in SwiftUI by providing coordinates inside the map's content closure, with appearance customization via modifiers like Video 🎥CLAUDE.md for iOS DevelopersThe video demonstrates how CLAUDE.md (a project root file read by Claude Code, Xcode's Claude Agent, and Codex) transforms AI coding by providing architecture and framework context before every task. It builds a production Thanks for reading Those Who Swift! Subscribe for free to receive new posts.
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