Podcast: “Gesture-driven animations”, with special guest Adam Bell
Adam Bell returns to the show to talk about animations, both how to make great use of the built-in animation tools that the iOS SDK ships with, but also how to drive custom, gesture-driven animation...
View ArticleControlling the timing of a Combine pipeline
Often when writing Combine-powered data pipelines, we want those pipelines to emit values as quickly as possible, as soon as each operation finishes. However, sometimes we might also want to introduce...
View ArticleDeciding what DispatchQueue to run a completion handler on
When it comes to calling completion handlers for asynchronous operations, the established convention within the Apple developer community has for long been to simply continue executing on whatever...
View ArticleSponsor: Architecting SwiftUI apps with MVC and MVVM
Thanks a lot to Matteo Manferdini for sponsoring Swift by Sundell last week to promote his SwiftUI guide “Architecting SwiftUI apps with MVC and MVVM”. The guide is completely free to download, and...
View ArticleIntroducing Plot Components: A new way to build HTML pages using Swift
Today I’m launching a huge update to my suite of Swift static site generation tools — specifically a brand new version of Plot, the library that’s used to generate all of this website’s HTML, which...
View ArticleAssigning an expression to a variable with the same name
New in Swift 5.4: It’s now possible to create a local variable that’s assigned to an expression that has the same name, without having to manually disambiguate with self.For example, the following...
View ArticleSponsor: Essential Developer
My thanks to Caio Zullo and Mike Apostolakis for sponsoring Swift by Sundell to promote Essential Developer and their iOS Career Crash Course — a free online course for iOS developers.While many iOS...
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Three ways to render a SwiftUI view in a playground
Although Xcode Previews is quickly becoming the go-to development tool for quick iterations and prototyping when building SwiftUI views, there are still situations when firing up a Swift playground can...
View ArticleAvoiding having to recompute values within SwiftUI views
In general, using computed properties can be a great way to model view-specific data that we want to create on-demand, when need — especially within SwiftUI views, since each such view already uses a...
View ArticlePodcast: “Anything can happen during WWDC”, with special guest Ish ShaBazz
Ish ShaBazz returns to the show for a special pre-WWDC episode about what new APIs and developer tools that Apple might announce at this year’s edition of the conference. What’s in store for Swift and...
View ArticleAvoiding problematic cases when using Swift enums
Swift’s implementation of enums is, without a doubt, one of the most beloved and powerful features that the language has to offer. The fact that Swift enums go way beyond simple enumerations of...
View ArticlePodcast: “An entire spectrum of apps”, with special guest Sean Allen
Sean Allen returns to the show to talk about using the MVVM design pattern within SwiftUI-based apps, building a course around MapKit and CloudKit, how to approach all of the new material that WWDC has...
View ArticleA Swift developer’s WWDC dreams - 2021 edition
With the start of WWDC21 just around the corner, I’d like to continue the tradition that I started in 2019, and share some of my biggest hopes and dreams for this year’s edition of the conference.Note...
View ArticleFirst looks at the new APIs and frameworks announced at WWDC21 on WWDC by...
As I have for the past two years, this year I’m once again sharing my first impressions of many of the new APIs and frameworks that are being introduced at WWDC, over on my dedicated website —...
View ArticlePodcast: “Structured concurrency”, with special guest Doug Gregor
Doug Gregor from Apple joins John to discuss Swift 5.5’s new concurrency features in great detail. How do features like async/await and actors work under the hood, and how were those concepts adapted...
View ArticleUsing the MainActor attribute to automatically dispatch UI updates on the...
One challenge when it comes to concurrency on Apple’s platforms is that an app’s UI can, for the most part, only be updated on the main thread. So, whenever we’re performing any kind of work on a...
View ArticleAutomatic conversions between Double and CGFloat values in Swift 5.5
New in Swift 5.5: The compiler can now automatically perform conversions between Double and CGFloat values.Although the two have always been equivalent on 64-bit systems, before Swift 5.5 (which is...
View ArticleConnecting async/await to other Swift code
Swift 5.5’s new suite of concurrency features definitely played a major role at this year’s edition of WWDC. Particularly, the newly introduced async/await pattern could not just be seen in the more...
View ArticleCustomizing how an external Swift type is encoded or decoded
For all of its strengths and overall convenience, one downside of Swift’s built-in Codable API is that it doesn’t really offer any standard way to change or otherwise customize how a given type should...
View ArticleBasics: Availability checks
Every year, Apple’s platforms keep progressing at a quite rapid pace, but very often, we also need our apps to support older versions of the various operating systems that they run on. So the challenge...
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