Xcode MCP vs CLI: Where did all the tokens go?
Plus: Turning iPhone Duo into a typewriter, why agentic coding feels like waterfall, and a playable iPod on Apple's 404 page.
Not only Swift
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2026
Swift Dependency Injection: The Singleton strikes back
Michael Long on iPhone Duo and singletons in Swift dependency injection, Felix Rieseberg on being more ambitious with models, calming down Claude with REVIEW.md, App Attest, OSLog, and positioning SwiftUI views around the fold.
You don't need .glassEffect(): Native SwiftUI in iOS 26, Cupertino.tech & SwiftFairy
How native SwiftUI controls adopt Liquid Glass in iOS 26 without extra code. Plus: Cupertino.tech's Apple SDK timeline, Margaret Hamilton's pioneering legacy, SwiftFairy code review for AI agents, iterative data loading in Swift, and reviving dinner parties.
Sub-50ms AI in Swift: System One Decisions & 55+ Polished SwiftUI Components
I built Swift support for sub-50ms AI decisions with Apple's Foundation Models. Plus: 55+ copy-paste SwiftUI components, practical code changes for the iPhone Duo, and why you should never let an LLM write your prose.
iPhone Duo Developer First Look: Foldable SwiftUI & Agent Skills
In Issue #104, we take a developer first look at Apple's new iPhone Duo with Jordan Morgan and updated agent skills from FloWritesCode. Plus: why authentic human voice matters in tech writing, declarative music in Swift, conditional breakpoints in Xcode, and iOS 26 concentric corners.
Developers run fleets of AI agents. Why aren’t normal people?
In Issue #103, I reflect on managing fleets of parallel coding agents in git worktrees, Maxwell Zeff investigates why everyday users haven’t touched AI agents, Jeff Huleatt blogs on physical paper, and Natalia Panferova dives into SwiftUI data dependencies.
Should SwiftUI become Open-Source? Plus Headless Xcode & Software Factories
In Issue #102, we explore headless Xcode and MCP in Xcode 27, examine why SwiftUI should be open-sourced, dive into software factories without slop, and share tools for coding agents, PR reviews, and brown-noise focus.
SwiftUI build speedups with ContentBuilder, Hybrid AI & Agent Plugins
How ContentBuilder speeds up compile times, plus Hybrid AI with Apple Foundation Models & Gemini, Agent Plugins, and the origin of Chrome Dino.
Not only Swift #100: Celebrating 100 issues, agentic iOS, Sendable & WhatCable
Celebrating 100 issues of Not only Swift! Featuring FlowDeck Studio, agentic iOS delivery pipelines, Sendable closures, adaptive SwiftUI toolbars, WhatCable USB-C diagnostics, and 2026/2027 iOS conferences.
Swift in the browser, @State as a macro & AI function bodies
In Issue #99, we compile Swift in the browser with MiniSwift, dissect the new @State macro in Xcode 27, generate function bodies at compile-time with @ai macros, and revisit ELIZA 60 years later.
Apple says: Stop splitting your SwiftUI views this way
This week we explore Stratos, my new suite of open-source AI agent skills, check out Apple’s new Foundation Models utilities, and dive deep into Xcode 27’s guidelines for high-performance SwiftUI view composition.
Is the IDE dead? Agentic coding, SwiftUI pitfalls, and the golden age of shareware
Are IDEs dying or just evolving? This week we explore the shift to agentic workflows, uncover 5 key SwiftUI pitfalls, and take a nostalgic look back at the shareware era.
Can you build entire SDKs using Agentic Engineering?
I tried it out myself and implemented a Swift version of the Mozilla Readability SDK using Agentic Engineering.
MCP is dead, long live the CLI! Plus, a skill for your SwiftUI animations
The Model Context Protocol (MCP) was introduced just a few months ago, and it already seems to be replaced by none other than the trusty CLI.
The Swift Programming Language Book goes to print, Agentic Coding, and On-Device Vector Databases
Someone printed a physical copy of the Swift Programming Language book, and it looks fantastic! Plus: Explore the rise of agentic coding with Pi and OpenClaw, and dive into Swift-based vector databases for on-device RAG.
Agentic Coding in Xcode, Swift Concurrency, and Star Trek Control Panels
Xcode 26.3 brings agentic coding, Alex Ozun shares a Zero to Hero guide for Swift Concurrency, and we look at some fun maker projects including a Star Trek control panel.
SwiftUI for terminal apps, calling MCPs via CLI, and more
Ever wanted to use SwiftUI to build terminal apps? Now you can! Also in this issue: how to (not) shoot yourself in the foot with AI agents, the secret to buttery smooth SwiftUI performance, and a fun language learning app.
GitHub Issues as a Database? 🤯
Plus: Inside Todoist's architecture, why you might be using AsyncStream wrong, and how to capture AI skills on the fly.
All you need are skills?
Coding agents are all the rage, but are they the future of software development?
Swift concurrency is hard. Let AI help.
Use this expert skill to help you write better code. Plus: A no-jargon guide for humans.
2025
SwiftUI Performance, Developer Tools, and Swift Concurrency
Why is your SwiftUI List so slow? This issue dives deep into SwiftUI performance secrets, plus my Firebase AsyncStreams livestream, clever developer tools, and Apple's beautifully updated Swift tutorials.
Hybrid AI with Swift and Firebase, and a font you can hear
In this newsletter, I typically covers lots of Apple-related topics, but this time, there is a banana 🤏 🍌! Also: thoughts on the future of programming, hybrid on-device / cloud AI with Apple Foundation Models and Firebase, aaaand - a font you can hear!
From Assembly to vibe coding - will computers finally understand us?
A collection of the latest and greatest in the world of Swift, SwiftUI, and mobile development.
Liquid Glass, docs for LLMs, and the future as of the 1960s
iOS 26 Liquid Glass implementation, AI documentation for LLMs, Xcode productivity hacks, and Firebase AI Logic tutorials
Speaking at Bletchley Park, Liquid Glass compatibility, and iOS 26 approaches
I will be speaking at Build with AI at Bletchley Park, plus different approaches to handling iOS 26 APIs with backward compatibility.
WWDC 2025 and beyond
WWDC 2025 - The developer community is excited about the new features, but the tech outlets are not as impressed.
Adding AI to your Swift apps, MVVM - hot or not, and WTF - Swift?!
Learn how to add AI to your Swift apps with Firebase AI Logic, why you don't need MVVM with SwiftUI, and why Swift thinks that 0.1 + 0.2 is not 0.3
💬 More human error messages, MCP, and DI for iOS Apps
Mastering user-friendly error messages, plus practical insights into the Model Context Protocol and Dependency Injection for iOS applications
🎨 SwiftUI Tips, Error Handling, and a Trip Down Memory Lane
Exploring SwiftUI styling, error handling, SF Symbols, and a fascinating look at Microsoft's original source code
🎯 AI, SwiftUI, and the Future of Development
Exploring MCP servers, SwiftUI tips, conference updates, and the evolution of development tools