Weekly Swift articles, podcasts and tips by John Sundell.
Swift by Sundell is updated every single week, all year round. This page contains the latest updates.
Subscribe via RSS to get notified when new content gets published.
How Combine’s operators for connecting and merging publishers can be used to solve real-world problems, such as nested network calls, handling multiple input sources, and more.
Vincent Pradeilles joins John to discuss various ways to use Swift language features like key paths and closures, how they relate to patterns typically used within functional programming, and when and how to adopt such patterns.
An overview of the sort of patterns and techniques that Swift’s extensions enable us to adopt, and how extensions can turn out to be one of the most powerful features that the language has to offer.
Combining dynamic and constant output values.
My latest article on the Bitrise blog.
A few different patterns and approaches that can be used to handle and render asynchronous loading states within SwiftUI-based views.
Simon Støvring, the developer behind several powerful iOS productivity apps, including Scriptable, joins John on an episode all about the new home screen widgets introduced in iOS 14. Topics include how to create and update dynamic widgets, managing and sharing data between an app and its widgets, and much more.
How Swift 5.3 lets us combine lazy properties with willSet and didSet observers.
How networking code can be tested without needing to introduce complex abstractions within our production code, by using system-provided APIs for overriding and mocking various kinds of requests.
Why rewrite views when we can reuse them?
An overview of the tools and techniques that we can use to create a clean separation between our view hierarchy, its styles, and the components that we’re looking to reuse across a given project.
Jordan Singer joins John to discuss various approaches of turning designs into fully implemented UIs, how to manage things like mock data during the development process, and when to turn a given view into a reusable component. Also, the story behind the Airport app and Jordan’s recent SwiftUI experiments.
A few different techniques that can help us share common networking logic, while also utilizing Swift’s advanced type system to make that kind of code more robust.
A new addition to UIKit in iOS 14.
A roundup of some of the key ways in which Swift 5.3 enhances the overall experience of building views using SwiftUI.
Carola Nitz, iOS developer at Netflix, joins John to discuss how larger iOS development teams typically operate, and how smaller teams can prepare their code bases for future growth. Also, organizing remote conferences, balancing feature development with bug fixing, and much more.
An overview of the key new UICollectionView APIs introduced in iOS 13 and 14, such as compositional layouts, diffable data sources, and cell registrations.
A tip for more dynamic navigation.
A look at various ways to use the many file system-related APIs that Swift offers — both on Apple’s own platforms, and on platforms like Linux — and a few things that can be good to keep in mind when working with those APIs.
Nick Lockwood returns to the show to go on a deep dive into data structures and algorithms, what some of the pros and cons of writing high-performance code in Swift are, and how all of that relates to parallelization and performance.
With or without storyboards.
This week, let’s take a look at a few examples of building custom debugging utilities for SwiftUI-based views — from specific methods to general-purpose abstractions.
An overview of the tools and directives that enable us to influence how our Swift code gets compiled, and what sort of situations that each of those tools might be particularly useful in.
Ben Scheirman, creator of NSScreencast, joins John on an episode all about UICollectionView. How have UICollectionView’s features evolved over time, and how are modern APIs like compositional layouts and diffable data sources changing the way collection views are built and used?
And how that can be customized.