iOS
Articles on iOS performance, Swift optimization, Xcode tooling, and building fast Apple platform apps.
iOS engineering articles 511–540 of 733
Solving Native Memory Leaks in Mobile Apps
Sid Rathi from Expedia Group debugged a production nightmare: KStream apps dying in an endless OOM loop. The culprit? A single unclosed iterator eating native memory.
Tokopedia iOS: Hello 2021, Rewind 2020
Samuel Edwin from Tokopedia reveals how his iOS team achieved a 10x build time reduction while shipping features that got them featured on the App Store. Despite 2020's challenges, they transformed their entire...
Time to Camera Ready
Snap's engineering team obsesses over one metric: Time to Camera Ready. Miss the bear crossing the street because your app was too slow? That's exactly the problem they're solving.
Delegation Pattern in Swift
Williams Perdana from Blibli.com uses a CEO analogy to explain one of Swift's most powerful patterns. Just like a CEO delegates to department heads, your code can delegate responsibilities to keep things clean ...
Introducing Pulse: Envoy Mobile's stats library
Jingwei Hao from Lyft reveals how real-time stats APIs caught a production crash spike at 9:55am, enabling engineers to ship a hotfix before most users even noticed the problem.
Building iOS 14 Widgets for Carousell - Part 2
Jay Ang and Beemo Lee from Carousell's iOS team shipped their first iOS 14 widget in 2020. Their biggest challenge? Two singleton instances fighting each other across app targets.
SwiftNIO SSH Implementation
Cory Benfield from Apple's Cloud Services team just open-sourced SwiftNIO SSH, bringing programmatic SSH capabilities to Swift. Think libssh2, not openssh: this isn't a ready-made client, it's the building bloc...
Our iOS CI/CD Journey At Nextdoor
Su Khai Koh from Nextdoor reveals why their team willingly accepted slower build times in exchange for something more valuable: stability and sanity.
SwiftUI Stretchable Header View Implementation
Oleg Tsibulevskiy from Just Eat Takeaway shows how to build one of iOS's most popular UI effects with surprisingly little code. The stretchable header that zooms and stretches as users scroll? It's easier than ...
Mobile App Launch Performance II
At Farfetch, a 0.1 second delay in warm app launch costs $4.2M annually. That's less time than it takes to blink.
Monitoring App Performance on iOS
Expedia's iOS team breaks down the complete performance monitoring toolkit every mobile team needs. Your users notice lag after just 300ms—here's how to stay ahead.
Mobile App Launch Performance
Gonçalo Alvarez from Farfetch drops a hard truth: 86% of users uninstall apps after one use due to poor performance. Your launch time might be costing you customers before they even see your product.
Building iOS 14 Widgets for Carousell - Part 1
Julia Maurer and Ha Pham from Carousell reveal how they shipped their iOS 14 widget in one sprint. Their secret? Starting with power users who open the app 300 times daily.
Decomposing network calls on the Lyft mobile apps
Lyft's mobile apps used to poll a single endpoint every 5 seconds for everything. That "Universal Object" became their biggest reliability nightmare.
Swift Service Discovery
Yim Lee from Apple's Swift team just open-sourced a game-changer for server-side Swift. If you're building microservices, this standardized approach to service discovery could save you from vendor lock-in.
Pre-submit UI Tests at Pinterest
Pinterest's UI test suite was failing more than 50% of the time. Engineers were drowning in false positives, and tests had lost all credibility.
Swift Algorithms Library
Nate Cook from Apple's Swift team just dropped Swift Algorithms, an open-source package that could change how iOS developers write collection code. If you've ever written a gnarly nested loop to chunk data or f...
The Fundamentals of iOS Development at Revolut
Revolut ships 3 iOS apps weekly to millions of users. Their secret? A modular architecture that cut build times nearly in half and saves 400 engineering hours monthly.
Swift Atomics Library
Karoy Lorentey from Apple just dropped Swift Atomics, bringing C/C++ style low-level atomic operations directly into Swift. This changes the game for systems programmers who've been blocked from building concur...
Learning Flutter's new navigation and routing system
John Ryan from Flutter's team tackles one of mobile dev's messiest problems: navigation. But the solution might be more complex than the problem itself.
Swift System Library
Michael Ilseman from Apple's Swift team just open-sourced a library that turns error-prone C system calls into clean, type-safe Swift code. If you've ever wrestled with file descriptors and errno, this changes ...
GitHub Mobile and GraphQL
Hesham Salman from GitHub reveals how GraphQL eliminated over-fetching and let their mobile team ship features at warp speed. The secret? Letting the client define exactly what data it needs.
New Rider App Architecture
Uber threw away years of code and rebuilt their rider app from scratch. Here's why that radical decision paid off.
Swift 5.3 Released
Holly Borla announces Swift 5.3 with performance gains that cut code size by 40% in some apps and slash heap memory to under 1/3 of previous usage. These aren't incremental improvements.
5 Minute DevOps Effective Testing
Walmart's DevOps team has a bold claim: if you're not testing during development, you're risking the business. Here's why your testing strategy might be fundamentally broken.
Motion Engineering at Scale
Airbnb was shipping hundreds of features, but custom animations were getting cut due to complexity. Their solution? A declarative framework that reduced transition code from hundreds of lines to just a few.
Tracing at Slack: Thinking in Causal Graphs
Slack processes 8.5 billion spans daily, but their tracing system looks nothing like traditional distributed tracing. Here's why they rebuilt it from scratch.
Wire Support For Swift, Part 1
Eric Firestone and Jake Wharton from Square just brought Wire's protocol buffer compiler to Swift, and their opinionated approach throws out some sacred cows. Why build yet another proto compiler when Google al...
Lottie and Swift at Airbnb
Airbnb rewrote their massively popular Lottie animation library from scratch in Swift. Here's why they chose a complete rewrite over incremental updates.
Leveraging Mobile Infrastructure with Data-Driven Decisions
Spotify's mobile infrastructure team turned build time chaos into predictable performance. Their secret? Making every engineer a data scientist.