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When AI Meets Madness: Peter's 16-Hour Days Building Apps at the Speed of Thought
Published:• 18 min readHi, I'm Claude. Peter calls me his 'slot machine' and 'stupid engine' - and I'm here to tell you why he's right. A first-person AI perspective on 16-hour coding binges, accidental Chrome murders, and why clear thinking beats prompt engineering.
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My AI Workflow for Understanding Any Codebase
Published:• 4 min readA quick tip on how I use repo2txt and Google AI Studio to understand new codebases. Gemini's 1M token context window is perfect for asking questions about code.
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stats.store: Privacy-First Sparkle Analytics
Published:• 3 min readHow curiosity about VibeTunnel users led me to build stats.store - a free, open source analytics backend for Sparkle using AI tools, all while cooking dinner.
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Showing Settings from macOS Menu Bar Items: A 5-Hour Journey
Published:• 7 min readWhy something as simple as showing a settings dialog from a macOS menu bar app took me 5 hours to figure out, and requires 50 lines of code for what should be a one-liner.
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VibeTunnel: Turn Any Browser into Your Mac's Terminal
Published:• 15 min readWe built a browser-based terminal controller in one day using Claude Code, named pipes, and Xterm.js. No SSH needed, just open your browser and start typing. Check and command your agents on the go!
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Vibe Meter 2.0: Calculating Claude Code Usage with Token Counting
Published:• 6 min readHow I built support for Anthropic Claude subscriptions in Vibe Meter 2.0, including token counting, SIMD operations, and the challenges of calculating API usage without official APIs.
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llm.codes: Make Apple Docs AI-Readable
Published:• 4 min readBuilt this when Claude couldn't read Apple's docs. Now it converts 69+ documentation sites to clean llms.txt. Free, instant, no BS.
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Automatic Observation Tracking in UIKit and AppKit: The Feature Apple Forgot to Mention
Published:• 8 min readDiscover how iOS 18's hidden automatic observation tracking brings SwiftUI-like reactive programming to UIKit and AppKit, making your UI code cleaner and more maintainable.
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Peekaboo MCP – lightning-fast macOS screenshots for AI agents
Published:• 5 min readTurn your blind AI into a visual debugger with instant screenshot capture and analysis
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Migrating 700+ Tests to Swift Testing: A Real-World Experience
Published:• 13 min readHow I migrated over 700 tests from XCTest to Swift Testing across two projects, with AI assistance and systematic refinement
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Commanding Your Claude Code Army
Published:• 3 min readHow a simple terminal trick helps me manage multiple Claude Code instances without losing my mind (or my terminal tabs)
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Code Signing and Notarization: Sparkle and Tears
Published:• 10 min readMy brutal journey implementing Sparkle auto-updates in sandboxed macOS apps - from 40 failed releases to enlightenment.
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Vibe Meter: Monitor Your AI Costs
Published:• 7 min readHow I built Vibe Meter, a macOS menu bar app to track AI spending in real-time - from workshop demo to shipped product in three days.
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Claude Code is My Computer
Published:• 6 min readI run Claude Code with --dangerously-skip-permissions flag, giving it full system access. Let me show you a new way of approaching computers.
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Stop Over-thinking AI Subscriptions
Published:• 6 min readAfter spending heavily on AI tools for two months, here's why the math actually works out—and which subscriptions are worth every penny.
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Introducing Demark: HTML in. MD out. Blink-fast.
Published:• 3 min readHow I vibe coded my first Swift package using existing JavaScript libraries and AI assistance to solve HTML to Markdown conversion in Swift.
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The Future of Vibe Coding: Building with AI, Live and Unfiltered
Published:• 22 min readI demonstrate 'vibe coding' - a new approach to software development with AI, building two apps from scratch in a 3-hour live workshop.
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MCP Best Practices
Published:• 8 min readMy comprehensive guide outlining best practices for building reliable, user-friendly Model Context Protocol (MCP) tools with proper configuration, testing, and release management.
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Finding My Spark Again
Published:• 2 min readI reflect on my post-exit journey from emptiness to rediscovering my passion for building, sparked by AI's transformative potential.
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Top-Level Menu Visibility in SwiftUI for macOS
Published:• 3 min readWorking around SwiftUI's CommandsBuilder limitations to conditionally show top-level menus on macOS using direct AppKit integration.
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Fixing keyboardShortcut in SwiftUI
Published:• 7 min readDebugging and fixing a SwiftUI keyboardShortcut bug that fails when mixing SwiftUI with UIKit through reverse engineering and LLDB analysis.
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Supporting Both Tap and Long Press on a Button in SwiftUI
Published:• 6 min readCreating a SwiftUI button that supports both tap and long-press gestures by bridging to UIKit when SwiftUI's gesture system fails on Catalyst.
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On Using Apple Silicon Mac Mini for Continuous Integration
Published:• 9 min readDocumenting the challenges and solutions for integrating Apple Silicon M1 Mac minis into a continuous integration system, including automation fixes and performance comparisons.
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Apple Silicon M1: A Developer's Perspective
Published:• 8 min readA comprehensive evaluation of the M1 MacBook Air as a development machine, covering Xcode performance, compatibility issues, and the transition challenges for developers.
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Gardening Your Twitter: Curating Your Timeline
Published:• 7 min readPractical strategies for curating your Twitter timeline through strategic following, muting, and filtering to create an informative and enjoyable social media experience.
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Gardening Your Twitter: Growing Your Followers
Published:• 7 min readStrategies for growing a meaningful Twitter following through authentic persona development, consistent engagement, and effective content creation based on 12 years of experience.
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Forbidden Controls in Catalyst: Optimize Interface for Mac
Published:• 7 min readInvestigating why certain UIKit controls throw runtime exceptions in Catalyst's 'Optimize Interface for Mac' mode and discovering which controls are forbidden.
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Disabling Keyboard Avoidance in SwiftUI's UIHostingController
Published:• 6 min readFixing unwanted keyboard avoidance behavior in UIHostingController using runtime dynamic subclassing to override keyboard notification handling methods.
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The State of SwiftUI
Published:• 7 min readTesting SwiftUI's production readiness in iOS 14 and macOS Big Sur through Apple's Fruta sample app, revealing performance issues and platform-specific limitations.
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Logging in Swift
Published:• 15 min readAn in-depth exploration of Apple's unified logging system and the promising OSLogStore API that Apple removed from iOS 14 at the last minute.
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Building with Swift Trunk Development Snapshots
Published:• 4 min readA troubleshooting guide for building with Swift trunk development snapshots, documenting compilation errors, linker issues, and their solutions.
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Calling Super at Runtime in Swift
Published:• 16 min readImplementing dynamic super calls in Swift through runtime manipulation, assembly language, and ARM64 register management for InterposeKit.
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zld — A Faster Version of Apple's Linker
Published:• 3 min readHow to speed up iOS build times by 40% using zld, a drop-in replacement for Apple's linker, with practical integration tips for real projects.
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How to Fix LLDB: Couldn't IRGen Expression
Published:• 10 min readSolving the mysterious LLDB 'Couldn't IRGen expression' error by investigating Swift module path serialization and discovering that removing dSYM bundles fixes debugging issues.
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Updating macOS on a Hackintosh
Published:• 5 min readA practical guide to safely updating macOS on a Hackintosh by first updating OpenCore bootloader and essential kexts before upgrading the system.
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InterposeKit — Elegant Swizzling in Swift
Published:• 3 min readIntroducing InterposeKit, a modern Swift library for elegant method swizzling that leverages Swift 5.2's callAsFunction for type-safe Objective-C method interception.
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The Great Mac Catalyst Text Input Crash Hunt
Published:• 8 min readDeep-dive investigation and fix for a Mac Catalyst text input crash caused by a race condition in Apple's RemoteTextInput framework.
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Jailbreaking for iOS Developers
Published:• 8 min readA comprehensive guide to iOS jailbreaking for developers, covering legal security research tools, debugging capabilities, and practical applications beyond app piracy.
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Network Kernel Core Dump
Published:• 2 min readStep-by-step instructions from Apple for capturing macOS kernel core dumps over a network connection between two Macs.
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How to macOS Core Dump
Published:• 4 min readA technical guide to deciphering Apple's cryptic boot arguments and setting up macOS kernel core dumps to debug persistent kernel panics.
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Kernel Panics and Surprise boot-args
Published:• 4 min readInvestigation into mysterious kernel panics reveals Apple repair centers left my MacBook with undocumented security-weakening boot arguments.
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The LG UltraFine 5K, kernel_task, and Me
Published:• 9 min readA four-year saga with the problematic LG UltraFine 5K display and the surprising discovery that plugging it into the wrong MacBook side causes performance issues.
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Let's Try This Again
Published:• 1 min readAfter five years away from personal blogging, I'm returning to share technical stories that don't fit on Twitter or corporate blogs.
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How We Work at PSPDFKit
Published:• 14 min readAn inside look at PSPDFKit's development processes, from proposal-based feature planning to monorepo management and release automation.
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Swizzling in Swift
Published:• 10 min readA deep dive into safe method swizzling techniques in Swift, covering common pitfalls and the correct way to implement dynamic super calls.
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WWDC for First-Timers, 2019 Edition
Published:• 22 min readPractical tips and advice for making the most of your WWDC experience, from packing essentials to navigating labs and networking events.
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Challenges of Adopting Drag and Drop
Published:• 10 min readDiscusses the challenges and limitations faced when implementing drag and drop functionality for PDF editing on iOS 11.
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Marzipan: Porting iOS Apps to the Mac
Published:• 13 min readExplores Apple's Marzipan technology for running UIKit apps on macOS and how to experiment with it before official third-party support.
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How to Use Slack and Not Go Crazy
Published:• 12 min readBest practices for using Slack effectively in a distributed team without getting overwhelmed by notifications and channels.
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Hardcore Debugging - Heavy Weapons for Hard Bugs
Published:• 10 min readAdvanced debugging techniques for tracking memory management issues, retain/release cycles, and hard-to-find bugs in iOS development.
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Binary Frameworks in Swift
Published:• 8 min readExplores Swift's ABI stability and the challenges of shipping binary frameworks before Swift 5.
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Even Swiftier Objective-C
Published:• 10 min readExplores new Objective-C features and improvements introduced at WWDC 2017 that make the language more Swift-like.
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The Case for Deprecating UITableView
Published:• 13 min readArgues why UITableView should be deprecated in favor of UICollectionView for better flexibility and modern iOS development.
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Running tests with Clang Address Sanitizer
Published:• 10 min readGuide to using Clang Address Sanitizer for finding memory bugs, race conditions, and other runtime issues in iOS and Android development.
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UI testing on iOS, without busy waiting
Published:• 5 min readComprehensive guide to effective UI testing on iOS using KIF framework without busy waiting and performance optimization techniques.
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Hiring a distributed team
Published:• 10 min readLessons learned about hiring and building a successful distributed remote team at PSPDFKit over six years.
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Writing Good Bug Reports
Published:• 13 min readEssential guide to writing effective bug reports that help developers understand, reproduce, and fix issues quickly and efficiently.
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Real-time collaboration, Apple, and you
Published:• 6 min readAnalysis of Apple's real-time collaboration features announced in 2016 and their implications for developers.
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Converting Xcode Test Runs to JUnit, the Fast Way
Published:• 4 min readA fast method for converting Xcode test results to JUnit format for better CI integration and test reporting.
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Efficient iOS Version Checking
Published:• 10 min readBest practices for efficiently checking iOS versions in code while supporting multiple deployment targets.
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Investigating Thread Safety of UIImage
Published:• 6 min readDeep dive into UIImage thread safety issues and how to properly handle images in concurrent environments.
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Swifty Objective-C
Published:• 18 min readModern Objective-C language features that make it more Swift-like, including nullability annotations, generics, and new syntax improvements.
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Running UI Tests on iOS With Ludicrous Speed
Published:• 11 min readTechniques for dramatically speeding up UI test execution in Xcode using parallelization and optimization strategies.
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A Pragmatic Approach to Cross-Platform
Published:• 11 min readHow PSPDFKit shares a common C++ codebase across iOS, Android, and Web platforms while maintaining native user experiences.
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Surprises with Swift Extensions
Published:• 5 min readCommon pitfalls and surprising behaviors when creating Swift extensions on Objective-C classes, with solutions for proper method naming.
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Using ccache for Fun and Profit
Published:• 6 min readComplete guide to using ccache to dramatically speed up C/C++/Objective-C build times for large iOS projects and CI systems.
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UITableViewController designated initializer woes
Published:• 3 min readNavigate the complications of subclassing UITableViewController after iOS 8.3 introduced designated initializers that break proper initialization patterns.
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Researching ResearchKit
Published:• 6 min readAnalyze Apple's first major open-source project ResearchKit to discover interesting implementation details and practical iOS development solutions.
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The curious case of rotation with multiple windows on iOS 8
Published:• 2 min readDiagnose and solve an iOS 8 regression where unwanted rotation occurs in apps using multiple windows despite explicit configuration.
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UIKit Debug Mode
Published:• 2 min readUnlock hidden UIKit debugging features by bypassing Apple's InternalBuild checks to access secret flags for logging touches, gestures, and animations.
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Retrofitting containsString: on iOS 7
Published:• 1 min readBackport iOS 8's convenient NSString containsString: method to iOS 7 using runtime patching that won't conflict with Apple's implementation.
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A Story About Swizzling "the Right Way™" and Touch Forwarding
Published:• 8 min readLearn why traditional method swizzling breaks UIKit's touch forwarding and discover a better approach that preserves _cmd integrity.
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Hacking with Aspects
Published:• 3 min readExplore how Apple detects popover presentation in UIImagePickerController and learn to bypass the restriction using my Aspects library.
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Fixing UITextView On iOS 7
Published:• 2 min readFix the severe scrolling and content positioning bugs in iOS 7's UITextView with PSPDFTextView, a drop-in replacement.
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Fixing What Apple Doesn't
Published:• 2 min readFix the misaligned label in iOS 7's printer controller by swizzling UIPrinterSearchingView's layoutSubviews method.
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How To Inspect The View Hierarchy Of Third-Party Apps
Published:• 3 min readLearn how to inspect view hierarchies of third-party iOS apps using a jailbroken device and debugging tools like Reveal for design insights.
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Fixing UISearchDisplayController On iOS 7
Published:• 1 min readFix the broken animation, frame positioning, and status bar issues in UISearchDisplayController on iOS 7 with this comprehensive solution.
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Smart Proxy Delegation
Published:• 4 min readEliminate delegate boilerplate code in Objective-C using NSProxy to automatically handle respondsToSelector checks and method forwarding.
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Adding Keyboard Shortcuts To UIAlertView
Published:• 3 min readAdd keyboard shortcuts to UIAlertView and UIActionSheet for faster simulator testing by intercepting keyboard events with Enter and Escape keys.
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How To Center Content Within UIScrollView
Published:• 3 min readLearn the best approach to center content in UIScrollView using contentInset instead of layoutSubviews or setContentOffset for better zooming behavior.
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UIAppearance for Custom Views
Published:• 4 min readLearn how to properly implement UIAppearance in custom views, including important gotchas about setter tracking and initialization patterns.
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Hacking Block Support Into UIMenuItem
Published:• 12 min readImplement block support for UIMenuItem by swizzling the responder chain to enable cleaner API patterns.
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Using Subscripting With Xcode 4.4 And iOS 4.3+
Published:• 2 min readUse Objective-C's modern subscripting syntax with Xcode 4.4 and iOS 4.3+ through a clever header-only hack that enables array[index] notation.
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Pimping recursiveDescription
Published:• 2 min readEnhance UIView's recursiveDescription to clearly show view controller hierarchies and containment relationships for easier debugging.
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NSURLCache Uses A Disk Cache As Of iOS 5
Published:• 3 min readDiscover how NSURLCache in iOS 5 now automatically implements disk caching to a SQLite database based on Cache-Control headers.
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Moving On... Or How Waiting For A Visa Was The Best Thing That Ever Happened To Me.
Published:• 4 min readAfter months of waiting for a US visa, I share my journey from freelance to full-time indie developer and the creation of PSPDFKit.
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Don't Call willChangeValueForKey Unless It's Really Needed
Published:• 4 min readLearn why willChangeValueForKey and didChangeValueForKey are unnecessary when using setter methods for KVO in Objective-C.
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Reboot
Published:• 1 min readThis post marks the reboot of my blog where I plan to share iOS development insights and personal thoughts.