Recent Articles

Open-Sourcing Pulse

Jul 6, 2021

Open-source developer tools

LazyImage

Jun 2, 2021

Lazy image loading for SwiftUI

Client-Side Search

Apr 9, 2021

How to build client-side search with lunr.js

Nuke Docs

Apr 8, 2021

How to build great documentation for a framework

The SwiftUI Experiment

Mar 30, 2021

Wrapping up the series on Pulse development

Time to Log

Mar 29, 2021

Designing and implementing Pulse for watchOS

Concurrency Done Right

Mar 24, 2021

The actor model and other concurrency patterns used in Nuke

What's a Document

Mar 15, 2021

A quick write-up on selecting a document format for Pulse

...But Not NSTableView

Mar 1, 2021

Integrating NSTableView with SwiftUI

AppKit is Done

Feb 24, 2021

Learn how to build delightful macOS apps using only SwiftUI

RxUI

Feb 16, 2021

Applying SwiftUI ideas to improve the developer experience of using RxSwift

Apple Documentation

Feb 15, 2021

Everything that is wrong with Apple's documentation

Triple Trouble

Feb 14, 2021

Implementing triple-column navigation in SwiftUI using NavigationView

XCFrameworks

Feb 13, 2021

Caveats of using XCFrameworks with Swift Package Manager

Pulse: Network Inspector

Jan 31, 2021

Building a multiplatform tool using SwiftUI

Formatted Strings

Nov 29, 2020

Using XMLParser and NSAttributedString to add support for basic formatting in localizable strings

WWDC20 Summary

Jul 13, 2020

An overview of the changes introduced on WWDC20 from the design and product perspective

Introducing Align 2

Jun 18, 2020

Layout anchors, reimagined

VPN, Part 2: Packet Tunnel Provider

Jun 14, 2020

Using NEPacketTunnelProvider to implement a VPN client

VPN, Part 1: VPN Profiles

May 24, 2020

Using Network Extension framework to create and manage VPN profiles

How Does VPN Work?

May 19, 2020

A Russian nesting doll of network protocols

Let's Build a VPN Protocol

May 18, 2020

How to implement a custom VPN client and server using Packet Tunner Provider

Nuke 9

May 17, 2020

Reflecting on the five years of the performance improvements

Introducing FetchImage

Mar 18, 2020

FetchImage makes it easy to download images using Nuke and display them in SwiftUI apps

SwiftUI Data Flow

Jan 16, 2020

Everything you need to know about data flow in SwiftUI

Effective Unit Testing

Dec 4, 2019

Why most unit testing is a waste in Swift and how to extract the most value from tests

CI for Swift Frameworks

Nov 13, 2019

How I went from manually testing my frameworks to having hundreds of unit tests and multiple automatic checks running on every change

SwiftUI Layout System

Oct 22, 2019

Taking a deep dive into SwiftUI layout system

Regex, Part 3: Matcher

Sep 25, 2019

Explore two different regex matching algorithms

Regex, Part 2: Compiler

Sep 22, 2019

What are Type-2 (or regular) languages? How can Finite State Automaton be used to recognize them? Where do regex fit into all this?

Regex, Part 1: Parser

Sep 15, 2019

Exploring Parser Combinators (or monadic parsers) which are a great example of functional programming used to bring practical benefits

Regex, Prologue: Grammar

Sep 9, 2019

Using a formal grammar to describe a regular expression language

Let's Build a Regex Engine

Aug 20, 2019

How to understand the language of <\/?[\w\s]*>|<.+[\W]>

Navigation Problem

Mar 24, 2019

How to solve it without Coordinators and why Coordinators might be not an optimal solution for you

Future<Value, Error>

Nov 12, 2018

Future – a streamlined Future<Value, Error> implementation with functional interface

Let's Talk Architecture

Aug 11, 2018

MVC – The Past. MVVM with RxSwift or ReactiveCocoa, MVP – The Present. Functional Architectures – The Future.

Are Optionals Any Good?

Jun 14, 2018

Taking a step back to see what is good and bad about Optional type in Swift

Resumable Downloads

Jun 6, 2018

Exploring how resumable downloads - one of my favorite new features in Nuke 7 - are implemented using HTTP range requests

Network Extension, Part 1 - Introduction

May 22, 2018

Introduction to a series of posts about the Network Extension framework

Trunk-Based Development

Mar 23, 2018

Why feature branches might prevent continuous integration and discourage refactoring and what other branching strategies are worth considering.

Creating Views in Code

Jan 12, 2018

Tips and tricks to keep code in your views nice and readable

Cancellation Token

Dec 15, 2017

A unified model for cooperative cancellation of asynchronous operations

Naive Date and Time

Dec 1, 2017

Foundation offers great APIs for manipulating dates with time zones, however, it might be missing a few things

Three Use Cases of Phantom Types

Nov 24, 2017

Adding additional type safety using phantom types on the examples

Align: Intuitive Auto Layout

Nov 17, 2017

I'm thrilled to introduce a new intuitive and powerful Auto Layout library - Align

Codable: Tips and Tricks

Nov 10, 2017

Introduced in Swift 4 to replace NSCoding APIs, Codable also features first-class JSON support

Smart Retry

Sep 3, 2017

Combining retryWhen operator with Reachability and delay options inspired by RxSwiftExt to implement auto-retries

API Client in Swift

Jul 10, 2017

How to implement a declarative and powerful API client using Alamofire, RxSwift, and Codable

Introducing RxNuke

Jun 11, 2017

I'm excited to introduce a new addition to Nuke - RxNuke which brings the power of RxSwift to your image loading pipelines

RxSwift Testing

Jun 6, 2017

Unit testing paging in a scroll view using RxSwift testing infrastructure - RxTest

Interface Builder: Previews

May 1, 2017

Using Interface Builder to quickly preview features on different screen sizes and in different orientations

Let's Build UIStackView

Jan 16, 2017

Explores how UIStackView works under the hood to build its open source replacement - Arranged

Core Data Progressive Migrations

Jun 18, 2016

Using NSPersistentStoreCoordinato and NSMigrationManager for progressive schema migrations in Core Data

Image Caching

Jan 26, 2016

In-depth look at HTTP cache and Foundation's URL Loading System to cache images on disk

Image Prefetching

Jan 12, 2016

An effective way to improve user experience by loading data ahead of time in anticipation of its use

Immutability and Builder Pattern

Jan 10, 2016

Modelling large immutable objects in Objective-C without creating telescoping initializers