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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A look at the various sorting APIs that the Swift standard library offers, and how could also augment those APIs in order to make more advanced sorting tasks easier to perform.
A neat technique for values that can’t be created with a single line of code.
How custom Combine operators and convenience APIs can be implemented using extensions, and how doing so can let us eliminate common sources of boilerplate when implementing things like networking and data validation.
Daniel Steinberg joins John to discuss how various functional programming patterns can be adopted in Swift, and how many of those patterns can be found in both the standard library and in frameworks like Combine and SwiftUI.
In this second article about integrating SwiftUI and UIKit, we’ll take a look at how SwiftUI views can be embedded within UIKit-based view controllers, and various ways of sharing state between them.
Using a dedicated protocol to make it easy to define new containers.
A closer look at how SwiftUI and UIKit can be combined in various ways, starting with how we can bring increasingly complex UIKit-based views and view controllers into the declarative world of SwiftUI.
James Thomson, creator of PCalc, returns to the show to discuss how developers can bring their apps to multiple Apple platforms using technologies like Catalyst and SwiftUI, and how and when it can be a good idea to share code across platforms.
Formatting numbers into human-readable strings can often be tricker than expected. Let’s explore why that is, and what kind of tools and techniques that can be good to keep in mind when formatting different kinds of numbers.
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.