iOS
Articles on iOS performance, Swift optimization, Xcode tooling, and building fast Apple platform apps.
iOS engineering articles 91–120 of 733
Core Data Agent Skill: Now available open-source
Antoine van der Lee just open-sourced a Core Data Agent Skill that could save you from rookie persistence mistakes. If you're still working with Apple's older framework, this is a game-changer.
Why Your Mobile App Is Not as Secure as You Think
Pavithra Chamod J from PickMe Engineering drops a hard truth: your mobile app's security measures are probably theater. Once an APK hits a rooted device, all bets are off.
Common Mistakes When Shifting Left in Mobile Testing
Russell Morley reveals why most mobile teams think they're shifting left in testing, but are actually just moving their pain earlier in the pipeline.
SwiftUI Agent Skill: Build better views with AI
Antoine van der Lee from SwiftLee introduces an open-source Agent Skill that teaches AI to write better SwiftUI code. No more fixing the same mistakes over and over in your AGENTS.md file.
Protecting Your GraphQL
Stas Kravets shares how a Python GraphQL service's P99 timeout detection was so unreliable that only P50 requests actually timed out as expected. The culprit? IO operations under heavy load can bring down your ...
What's New in Swift: January 2026 Edition
Nick Sloan from Studioworks processed millions in invoices with Swift on the server and saw fewer production bugs than in 20 years of web development. Here's what's happening in the Swift ecosystem this month.
Optimizing GRDB in Todoist for iOS
Todoist's iOS app became nearly unusable for some users after migrating from Realm to GRDB. The culprit? A SQL query generating 128,136 intermediate rows from just 399 actual records.
AI App Development: What I Learned in One Month
Antoine van der Lee shipped an AI-powered app in one month and hit a wall so hard he almost killed the project. His biggest mistake? Moving too fast.
Improving the Usability of C Libraries in Swift
Doug Gregor from the Swift Language Steering Group reveals how to transform clunky C library APIs into elegant Swift code without touching a single line of the original C headers.
11 Things I learned after using AI Agents full-time
Antoine van der Lee went all-in on AI agents for iOS development and jokes that 'Arie and Ingrid (AI) are doing my work while we're having lunch.' After months of daily use, his workflow has changed more than i...
Performance-Focused UIKit Rendering and Animation Flow
Rabia Mercan from Teknasyon reveals why your smooth UIKit animations are secretly destroying performance. The culprit? Offscreen rendering you never knew was happening.
Xcode 26: Enhanced Security for iOS Apps
Timothy Werquin from Guardsquare reveals why Apple's new Xcode 26 'enhanced security' features miss the most common iOS app threats. While exploit mitigation sounds impressive, the real danger lies elsewhere.
The Journey to Compose Hot Reload 1.0.0
Sebastian Sellmair and Azat Abdullin from JetBrains reveal how they built Compose Hot Reload 1.0.0—a zero-config tool that lets you update Kotlin UI code instantly while preserving app state. The engineering be...
Compose Multiplatform 1.10.0
Elvira Mustafina from JetBrains just dropped Compose Multiplatform 1.10.0, and it's solving one of the most annoying pain points in cross-platform development. Three different @Preview annotations? Gone.
Agent Skills explained: Replacing AGENTS.md with reusable AI knowledge
Antoine van der Lee reveals why he ditched AGENTS.md files across all his projects. The replacement? A reusable AI knowledge system that's already supported by Cursor, Claude, and Gemini.
Swizzling SwiftUI View Body
Noah Martin from Sentry cracked a problem that seemed impossible: swizzling pure Swift code to automatically track SwiftUI view performance. The technique is wild.
Project Butter: A Journey for App Performance Improvement
Gojek's Android app was taking 14.35 seconds to launch. With 500+ modules and millions of lines of code, something had to change.
Unlock Native Power in Flutter Part 2
Flutter developers: still treating native integration like a black box? You're leaving serious performance on the table.
Mastering Location Services in Mobile Apps — A Guide for Android (Jetpack Compose) & iOS (SwiftUI)
Pavithra Chamod J from PickMe Engineering breaks down the biggest challenge in mobile dev: making location services work seamlessly across Android and iOS without draining batteries or violating privacy.
The State of Agentic iOS Engineering in 2026
Thomas Ricouard spent only 2% of his time in Xcode last year while shipping more iOS code than ever. His secret? Treating AI agents as tireless coworkers, not autocomplete tools.
Unlock Native Power in Flutter Part 1
Flutter's cross-platform magic hits a wall when you need native APIs. Here's how to bridge that gap without losing your mind.
Demystifying user journeys: Revolutionizing troubleshooting with auto tracking
Ever tried debugging a mobile app crash without knowing what the user actually did? You're flying blind.
What's New in Swift: December 2025 Edition
Tim Sneath reflects on Swift's explosive growth: from a simple blog post 10 years ago to 70+ repositories with hundreds of weekly contributors. The language now runs everywhere from Pebble watches to AWS Lambda...
How Mobile Development Teams Use Kotlin in 2025
José Luis González, a JetBrains-certified Kotlin Trainer, reveals the production bugs that still plague mobile teams in 2025. One tiny mistake in exception handling can silently break your entire app's lifecycl...
Kotlin 2.3.0 Released
Kotlin 2.3.0 just dropped with some serious multiplatform firepower. If you're building cross-platform apps, this release fundamentally changes how you work with Swift, Wasm, and native code.
Preventing Performance Regressions on iOS Apps
JioHotstar was stuck in a frustrating cycle: fix performance issues, ship the update, watch them resurface weeks later. Sound familiar?
Exploring KotlinX Benchmark Results with Kotlin Notebooks
Filipp Zhinkin and Teodor Irkhin from JetBrains show how staring at raw benchmark tables is costing you insights. Kotlin Notebooks turn those text dumps into interactive visualizations that actually tell a stor...
How to implement iOS widgets in Expo apps
Arthur Spalanzani built an affirmations app where the widget IS the product, not a companion feature. His widget-first approach achieved 80.7% adoption and unlocked organic social sharing that traditional app s...
React Native Version 0.83 Release
React Native 0.83 just dropped with a historic first: zero breaking changes. The team is finally delivering on their promise of predictable, painless upgrades.
The Ultimate Kotlin Multiplatform Watchlist
Ekaterina Petrova curated 10 KotlinConf talks that show how Duolingo, McDonald's, and StoneCo achieved massive scale with Kotlin Multiplatform. Skip the beginner mistakes and learn from teams already shipping t...