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How Apple migrates projects to Swift · A new iOS 27 API for UIKit · A creative way of using markdown in SwiftUI

Featuring: How to free up Xcode disk space safely with an AI Agent

App copywriting & Agents · SwiftData's new HistoryObserver · Timezone testing without physically traveling

Featuring: How to Test iOS Apps in Different Time Zones on a Physical iPhone

A new Agent Skill · AI Mission Control · Splitting Large SwiftUI Views using Apple's Best Practices

Featuring: User Diagnostics Reports: Solving app bugs faster with AI Agents

Spending $10K per week on agents · A new Safari MCP server · A risk of rotating a Liquid Glass view

Featuring: Defer in Swift explained with Code Examples

Using Cursor in Xcode 27 · 3 breaking changes in iOS 27 SDK · A proxy, agent integration, and camera solution for Xcode's Simulator

Featuring: Memberwise Initializer in Swift explained with Code Examples

AI Controlling Xcode's Device Hub · A new CLI for App Store Connect · What's new in SwiftUI & Swift Concurrency?

Featuring: Swift 6.4: What’s New in Concurrency

What's new in SwiftData? · A peek into Xcode 27' SwiftUI Agent Skill · Using Claude with Foundation Models

Featuring: SwiftUI Best Practices, straight from Apple's Xcode 27 Agent Skill

Xcode 27's Agent' Skills · Is RocketSim sherlocked? · An often used Property Wrapper that changed into a macro in SwiftUI

Featuring: Using Xcode 27's Agent Skills in Claude, Codex, and Cursor

I built a new app: Introducing MCP Beast · Stateless actors? · WWDC Quiz to warm you up

Featuring: WWDC 2026: My predictions and wishes

Xcode Instruments & Swift Concurrency · Accessibility at WWDC'26 · The MCPs I use for polishing app releases

Featuring: Using Xcode Instruments to optimize Swift Concurrency Code

IFTTT MCP and Reddit for App Promotion · safeAreaBar in SwiftUI · XcodeMCP and Claude Code

Featuring: Recording a Physical iPhone for App Preview Videos

AI-Powered Xcode Simulator Automation · Dynamic Quick Actions on iOS · A new Accessibility Competition with prices

Featuring: AI-Powered Xcode Simulator Automation (token-efficient)

Indirect enum cases in Swift · Unexpected Task suspension points slowing down your apps · 63% fewer tokens used to navigate the Simulator using Agents

Featuring: Unexpected Task suspension points in Swift Concurrency

SwiftUI Animations · SwiftUI Performance Tuning · Column breakpoints in Xcode

Featuring: Immediate tasks in Swift Concurrency explained

Apple Developer meetup during WWDC · Draggable bottom sheet in SwiftUI · Xcode Instruments x AI Agents

Featuring: Xcode Instruments Time Profiler: Improve performance with AI

Network Optimization using AI Agents · Lazy properties in SwiftUI? · Kids & Vibe Coding

Featuring: Network Requests Optimization using Xcode’s Simulator & Agents

SwiftUI is not accessible by default · A list replacement in SwiftUI · Controlling the Simulator using Agents

Featuring: RocketSim 15: VoiceOver Navigator & Pro Simulator Recordings

6 new Agent Skills for Xcode · WWDC 2026 Pins · Swift 6.3 and Xcode 26.4 must-knowns

Featuring: Xcode Build Optimization using 6 Agent Skills

Apple's Hidden Collection & Sequence APIs · The "One More Prompt" risk · Generally useful prompts for app development

Featuring: The “One More Prompt” risk of agentic coding

7 (!!) Swift Evolution Proposal changes · Xcode 26 Compilation Caching · Spacer side effects in SwiftUI

Featuring: Agentic Development: Multi-Project Challenges

4 new Agent Skills for iOS development · A 9-Step framework for choosing the right Agent Skill · A new iOS 26 SwiftUI Modifier

Featuring: A 9-Step Framework for Choosing the Right Agent Skill

Combining MCP & Agent Skills · Optimizing SwiftUI animations using AI · Integrating AI into Xcode's Simulator

Featuring: Using an MCP to perform product optimizations

A new VoiceOver Navigator tool for Xcode · Tracking token usage in Foundation Models · Two SwiftUI animation articles

Featuring: VoiceOver Navigator & 120 FPS Recordings for Xcode’s Simulator

An Agent Skill for Swift Testing · Using Gemini in Xcode · Automating Codex & The Agentic Loop

Featuring: Swift Testing Agent Skill: Write high quality tests with AI

Agentic Coding in Xcode · Is Combine dead? · A new way of testing VoiceOver

Featuring: Core Data Agent Skill: Now available open-source

An interview with the creator of Clawd · A new SwiftUI Agent Skill · How Apple hooks entire frameworks

Featuring: SwiftUI Agent Skill: Build better views with AI

AI Agents eating SaaS · Unexpected SwiftUI Binding side effect · A brand new Agent Skill for SwiftUI

Featuring: AI App Development: What I Learned in One Month

AI Prompts for network requests · @_exported import VS public import · Universal Links at scale

Featuring: 11 Things I learned after using AI Agents full-time

Fight Google and Apple Reviews · Agent Skills explained · Inline arrays in Swift

Featuring: Agent Skills explained: Replacing AGENTS.md with reusable AI knowledge

Codex Skills for iOS Development · Replay network requests inside Swift Tests · LLM improvements 12 months later

Featuring: Icon Composer: Transforming an AI-generated icon

The importance of being your own end user · SwiftLee in 2025: A year in review · NSSpain Conference videos!

Featuring: SwiftLee in 2025: A full year as an indie developer

SwiftAgents · Giving your agents eyes · Stretchable headers in SwiftUI

Featuring: From App Idea to 10K MRR – YouTube Series

From App Idea to 10K MRR · SwiftUI Group being harmful? · Swift Configuration 1.0

Featuring: 9 months of a Swift Concurrency Course

Copycat apps and App Store Guidelines · Getting your talk accepted at conferences · AI-power App Metric Insights

Featuring: Battery life on iOS and the impact of killing apps

Teaching AI to read Xcode builds · The Transferable protocol · Swift Package Scripts

Featuring: The 7 changes I do for every new Xcode project

Black Friday discounts · Using @Observable with UIKit · A SwiftData change you might not have noticed

Featuring: Black Friday: SwiftLee Courses & RocketSim

Approachable Concurrency · Xcode Instruments & suspension points · Two defeated conference challenges

Featuring: Approachable Concurrency in Swift 6.2: A Clear Guide

From App Idea to 10K MRR · From Swift to Mojo · One Swift mistake...

Featuring: MainActorMessage & AsyncMessage: Concurrency-safe notifications

Simulator Camera Testing · A goodbye to a long running conference · Optimize the performance of your SwiftUI app

Featuring: Simulator Camera: Test your app without a physical device

Xcode Build Performance Analysis · Swift for Android · WWDC APIs timeline

Featuring: Build performance analysis for speeding up Xcode builds

Glass Views & Animations · Singletons & Swift Concurrency · Structured experiments

Featuring: SwiftUI Architecture: Structure Views for Reusability and Clarity

My AI Agents journey · The importance of Swift Migration Tooling · Custom ViewModifiers are useless

Featuring: Why Swift Migration Tooling Matters

if expressions as assignments (click to see the post)

Featuring: The 5 biggest mistakes iOS Developers make with async/await

Next-level Xcode Simulator recordings · Additional iOS 26 documentation for Agents.md · Swift Package Manager traits

Featuring: Derived Data: 5 Things iOS Developers Do Wrong

Apple Docs for LLMs · Supporting async calls in defer · Physics-driven moti

Featuring: App Store Optimization: Real-world Best Practices

Nothing really stands out · Copy is hard to read · Images don't feel part of a consistent design · Screenshot 1: Build trust & authority · Screenshot 2: Core Benefit (Aha moment) · Screenshot 3: Breadth & add more trust

Featuring: Introducing Diagnostics: Improved Debugging and User Support

A new free 5-day email course launching later this month · RocketSim's major macOS Tahoe update · New performance related lessons for my Swift Concurrency Course

Featuring: SwiftUI Toggle: A Complete Guide

Dealing with Xcode migrations · Debugging Swift Concurrency · Controlling warnings in Swift Packages

Featuring: @ViewBuilder usage explained with code examples

Raw Identifiers in Swift · Using a WebView in SwiftUI · Using App Intents correctly

Featuring: Swift Computed Property: Code Examples

My Apple Design Workshop experience · The end of Property Wrappers? · Watch out for 30,000x slower Equatable conformance

Featuring: Property Wrappers in Swift explained with code examples

@isolated(any) · New Observations API · SwiftUI for macOS Tahoe

Featuring: Async await in Swift explained with code examples

My favorite open-sourced Apple frameworks · The biggest benefit of Going Indie · A special "I'm on a holiday" edition

Featuring: Global actor in Swift Concurrency explained with code examples

A threading risk for Combine & Swift Concurrency · Flux pattern in Swift · A crash debugging experience

Featuring: Combine and Swift Concurrency: A threading risk

Snapshot testing and CI · A hidden Xcode 26 AI prompt · 10 + 1 tips on using Claude Code

Featuring: Threads vs. Tasks in Swift Concurrency

@Animatable in SwiftUI · Preparing for the future of App Development · 6 Mistakes that slow down development

Featuring: Modern Swift Lock: Mutex & the Synchronization Framework

Vibe coding in Xcode 26 · Extensible enums in Swift · Designing UI with Liquid Glass

Featuring: Swift Concurrency & Swift 6 Course (Launch offer)

The end of Flutter? · Losing £25,000 · Time to drop support for older iOS versions?

Featuring: Sparkle: Distribution apps in- and out of the Mac App Store

Reverse-Engineering Xcode's Coding Intelligence prompt · Speed up iOS Launch with fault ordering · Running the camera in Xcode's Simulator

Featuring: #Playground Macro: Running Code Snippets in Xcode’s canvas

Default Actor Isolation · macOS Tahoe & App Icons · SwiftData or...?

Featuring: Default Actor Isolation in Swift 6.2

Notable WWDC changes · Automatic observation tracking for UIKit · What is it like to visit WWDC?

Featuring: @concurrent explained with code examples

Microapps architecture · Private APIs for hidden UIKit views · SwiftUI tracing using Macros

Featuring: Unique values in Swift: Removing duplicates from an array

Build apps without Xcode or xcodebuild · Camera support for Xcode's Simulator · An App Store Connect feature you need to enable

Featuring: Billing Grace Period Explained: How It Works and Why It Matters

Default Isolation in Swift 6.2 · The .ignoredByLayout() modifier in SwiftUI · Optimizing Mathematical Computations in Swift

Featuring: Institutional Purchases: Understanding and Detecting

Testing SwiftUI views · What's new in Swift 6.2? · Using Model Context Protocol on iOS

Featuring: Universal Links implementation on iOS

3 Indie Marketing Tips · Using Task Local values for dependencies · Will WWDC have a big impact?

Featuring: Testing push notifications on the iOS simulator

On-Device AI Models · A single line that bricks your iPhone · What happens if you don't know the answer?

Featuring: SwiftUI ForEach Explained with Code Examples

A first look at Swift 6.2 · A code deprecation coming in iOS 19 · Create MCP Servers in Swift

Featuring: Swift 6.2: A first look at how it’s changing Concurrency

How .ipa files can increase app security · Optimizing user flows in apps · Flexible SwiftUI user interfaces

Featuring: Swift Reduce: Combining elements into a single value

Structured spacing in SwiftUI · Test scoping traits · A great app that nobody knows about

Featuring: SwiftUI Alert Guide + Code Examples

What's new in Xcode 16.3 and Swift 6.1? · Static vs. Dynamic dispatching · New: RocketSim AI

Featuring: SwiftUI Grid, LazyVGrid, LazyHGrid Explained with Code Examples

SwiftData's ModelActor is weird · A new FlowNavigation library for SwiftUI · Why you should avoid using Group in SwiftUI

Featuring: SwiftUI TabView: Explained with Code Examples

SwiftUI Coordinator Pattern · Is it time to migrate to Swift 6? · Structural Identity in SwiftUI

Featuring: Swift Concurrency Course: Modern Concurrency & Swift 6

Rendering Pixel Art in SwiftUI · .animation() vs. withAnimation() · An @Observable performance risk

Featuring: Picker in SwiftUI explained with code examples

Structured Concurrency? · SwiftUI Animations · Threading in Swift Concurrency

Featuring: What is Structured Concurrency?

Conference ticket giveaway · Task.yield vs. Task.sleep · What is a good course price?

Featuring: Task.sleep() vs. Task.yield(): The differences explained

Swift 6 · ScrollTargetBehavior protocol · A major milestone for RocketSim

Featuring: Swift 6: What’s New and How to Migrate

ControlGroup in SwiftUI · 1-on-1 with an app development expert · My favorite books

Featuring: How to develop an app for iOS

Can you land an iOS job within 1 year? · Winning an Apple Design Award · Open-sourcing Swift Build

Featuring: Parameterized tests in Swift: Reducing boilerplate code

Debugging the undebuggable · Color mixing in SwiftUI · Indie app launch learnings

Featuring: Network Link Conditioner: Simulating Slow Networking

Network Speed Control for Xcode's Simulator · Important App Store News · Creative Coding using Swift

Featuring: RocketSim 13 - Network Speed Control

SwiftUI Navigation Patterns · Will AI replace app developers? · Building crash-free apps

Featuring: SwiftUI Lists: Present rows of data explained with code examples

From Apple Design Award to Going Indie · An Xcode feature that removed 66k lines of code · What defines a Senior?

Featuring: iOS App Development: How to get started?

SwiftLee 2024 In Review · SwiftLee's Most Read Articles of 2024 · What to expect from SwiftLee in 2025

Featuring: SwiftLee in 2024: Lessons learned and achievements

Dealing with in-app subscription billing issues · Getting started with Swift · Localization using SPM

Featuring: Swift Tutorials: Learn Swift with Easy-to-Follow Code Examples

Noncopyable types in Swift · Exploring MLX Swift · Xcode Library Customization

Featuring: SwiftUI Button: Custom Styles, Variants, and Best Practices

Exploring Apple Intelligence · SwiftUI Design System · Mutable let in Swift

Featuring: SF Symbol: How to for Swift & SwiftUI

Concurrency step-by-step · Geometry Effect in SwiftUI · Reducing an iOS app's size by half

Featuring: Enum explained in-depth with code examples in Swift

Black Friday Discounts · Apple Intelligence in SwiftUI · Balancing support requests in side projects

Featuring: Black Friday: 50% discount on RocketSim & Going Indie Course

App Store Nominations · ChatGPT for Xcode · Lazy vars and observable classes

Featuring: Contingent pricing for in-app subscriptions

Xcode's integrated code formatter · ARCtic Conference · Is Swift too complex?

Featuring: MainActor usage in Swift explained to dispatch to the main thread

Apple Intelligence · GitHub Copilot for Xcode · Common concurrency mistakes

Featuring: URLSession async/await: Perform network requests in Swift

SwiftUI View Transitions · Expedited App Reviews · Debug SwiftUI Crashes

Featuring: Mastering the @require Macro in Swift Testing

30% discount on iOS Courses · Working at startups vs. large companies · What is @preconcurrency actually doing?