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.
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Josh Shaffer and Eliza Block from Apple join John to talk about what’s new in SwiftUI, how Xcode Previews work under the hood, the new home screen widget system, Apple’s internal process of adopting and improving SwiftUI, and much more.
Let’s take a look at one possible venue for learning and exploring SwiftUI without having to necessarily deploy it directly into production — by building internal tools and various prototypes.
How SwiftUI’s new StateObject property wrapper works, and how it compares to ObservedObject.
Daily, highly technical coverage of WWDC20 by me and my friends.
With just a few hours to go until WWDC20 kicks off with the first ever online-only Apple keynote, I thought I’d do the same thing as I did last year, and share a few of my biggest Swift-related dreams for this upcoming WWDC.
Several ways of defining default values for initializers and functions.
Dave Verwer and Sven A. Schmidt join John to talk about their newly launched Swift Package Index, and what the overall state of Swift’s package ecosystem currently is. Also, dependency management, composing libraries, deploying server-side Swift in production, and much more.
Let’s take a look at a few key APIs and techniques that can be really useful when building custom developer tools, scripts, or other kinds of automation, in Swift.
Making Codable much more flexible.
This week, let’s explore a few different techniques for handling dynamic, polymorphic model data, in ways that still leans into Swift’s strong emphasis on type-safety.
On this special episode, John is joined by the entire team behind the award-winning apps Halide and Spectre, Apple’s 2019 App of the Year. Ben, Sebastiaan and Rebecca share their stories of how these apps came to life, how they’re working together between design and development, and how technologies like Computational Photography and Augmented Reality are influencing their work.
A summary of all Swift by Sundell content published during May 2020.
This week’s article is about library development, and contains a few techniques and principles that can be good to keep in mind when designing and building reusable Swift libraries.
How I got started with programming, writing, and podcasting.
Testable code without any protocols.
Let’s take a look at a number of techniques, patterns, and ways of structuring UI code that can help us get the very most out of Xcode’s SwiftUI-powered preview system.
In this Basics article, let’s take a look at a few examples of the various kinds of properties that Swift supports, and what their characteristics are.
In this article, I’ll aim to explain both why I chose not to use any client-side JavaScript when building Swift by Sundell, and why I thought that it was important to emphasize that fact at the bottom of every page.
Kyle Lee, also known as Kilo Loco, joins John to go behind the scenes of Publish — the static site generator used to build Swift by Sundell. Also, how to make a code base accessible to new team members, learning from open source, getting started with Swift-based web development, and much more.
This week, let’s take a look at a few techniques that can help us make our code easier to read, test and maintain, by reducing the amount of indentation within it.
Making it easy to observe a single value in a read-only fashion.
Adding more contextual information to test failures.
Let’s take a look at a few techniques that can make it much simpler to propagate runtime errors to our users, and how employing some of those techniques could help us present richer error messages without having to add a ton of complexity within each UI implementation.
Let’s take a look at how Swift’s key paths work, and how they relate to functions — both in terms of what comes built into the language itself, and what kind of utilities that we can write ourselves to form some really nice convenience APIs.
Tobias Due Munk joins John to talk about using SwiftUI to build prototypes, how third party developers can extend SwiftUI’s built-in APIs in various ways, and to discuss the challenges of writing highly dynamic systems in Swift.