Stewart Lynch iOS Articles & Videos

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Swift Attached Macros: Build a Real-World Member Macro from Scratch

June 28, 2026

Writing the same id property for every Identifiable enum gets old — especially with associated values. This video builds @CaseIdentifiable, an attached macro that inspects an enum, extracts cases, ignores associated values, and generates a computed id: String property automatically. No boilerplate, no mistakes.

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Swift Macros Demystified: Build a Freestanding Expression Macro

June 22, 2026

Stewart Lynch

Swift macros let you write code that writes code — but how do they actually work? This video builds a freestanding expression macro from scratch so you understand the internals: syntax trees, expansion, and debugging. No magic, just practical macro development.

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Build a Swift Terminal Developer Toolkit with TUIkit | Pomodoro, Git Status & Release Tracker

June 14, 2026

Stewart Lynch

Stop switching between apps. Build a unified developer terminal toolkit using pure Swift and TUIKit. This video creates three tools in one CLI app: a Pomodoro timer for focus sessions, a Git status viewer for repository health, and a release tracker for version monitoring. All interactive, all in the terminal, all pure Swift.

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Build Terminal Apps in Pure Swift with TUIKit - Getting Started Guide

June 7, 2026

Stewart Lynch

You don't need ncurses or C bindings to build terminal apps in Swift. TUIKit is a pure Swift toolkit for creating interactive command-line interfaces — menus, colored output, user input handling, and more. This getting started guide walks through installation, basic components, and building your first interactive terminal tool.

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Apple's Hidden AI: Unlock Foundation Models on Your Mac with Apfel

May 31, 2026

Stewart Lynch

Apple already shipped AI models onto your Mac. If you're running Apple Silicon with macOS 26+ and Apple Intelligence enabled, you have Foundation Models sitting there – no API key, no subscription, no cloud. This video explores Apfel, an open-source command-line tool that unlocks them for local use.

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Understanding Swift Result Builders-The Power Behind ViewBuilder

May 17, 2026

Stewart Lynch

Understand how Swift Result Builders work under the hood. The real power behind ViewBuilder, @resultBuilder, and custom DSLs.

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Generating a QR Code from a String in SwiftUI

May 8, 2026

Stewart Lynch

The article explains how to generate QR codes from text using Core Image's built in qrCodeGenerator filter. It presents QRCodeGenerator as an enum with static functions (acting as a namespace, not an initializable type). The implementation uses CIFilter.qrCodeGenerator(), sets the message as Data from the input string, applies error correction level M, scales the output image (typically by 12x because the raw output is tiny), converts to CGImage then UIImage then SwiftUI Image. The article also covers using .interpolation(.none) to keep edges crisp, separating user input from committed QR code text with two @State properties, and handling failure cases.

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