Of course, one tradeoff with our final solution is that whenever we wish to refer to Proxy, we now have to make the enclosing type conform to our ProxyContainer protocol. However, the compiler is only able to infer the underlying return type when all of the code branches within a given function or computed property return the exact same type. One of the most commonly faced challenges when adopting a more CI-centric workflow is flakiness, which is when a given set of tests and verifications seem to either succeed or fail at random. On this special episode of the show, John wraps up the 2020 season by revisiting some of the key themes and topics that were discussed on the show during the year. To demonstrate, let’s create a FileUploader class (which needs to be a subclass of Objective-C’s NSObject). By default, a property wrapper is completely disconnected from the enclosing types in which it’s being used, which can prove to be quite limiting in certain situations. Like its name implies, Swift’s property wrappers feature enables us to wrap a given property value within a custom type, which in turn lets us apply transforms and run other kinds of logic whenever that value is modified. operator with a key path-specific variant, we can do the same thing with the == operator as well, and just like before, we’ll return a Bool-returning closure that can then be directly passed to APIs like filter: With the above in place, we can now easily filter any collection using a key path-based comparison, like this: Depending on who you ask, the fact that Swift lets us easily create the above kind of functionality through a couple of lightweight overloads is either really awesome or incredibly concerning. For example, Publish (which is the static site generator used to build all of Swift by Sundell) has two separate Bitrise workflows, one for macOS and one for Linux, that can both run in parallel. A look at the various sorting APIs that the Swift standard library offers, and how we could augment those APIs in order to make more advanced sorting tasks easier to perform. Really nice! Thanks for reading! Genius Scan : Add advanced document scanning features to your app using Genius Scan’s powerful SDK. Filtering collections through type-safe predicates built using closures and operators. What do you think? AUG 28, 2020. Of course, just because it might be a good idea to avoid AnyView as much as possible doesn’t mean that it should never be used. But without best practices and robust architecture, you soon end up with unmanageable spaghetti […] If you are interested in iOS/Swift at all, you should be listening to Swift by Sundell. Even though Bitrise ships with a fair amount of built-in functionality that helps reduce the potential for flakiness (such as automatic retries for UI tests), at the end of the day, the overall, long-term stability of our tests will always come down to how they were actually written. Thanks for reading, and hope you’ll enjoy this new version of Swift by Sundell! SwiftUI ships with a special view called AnyView, which can be used as a type erased wrapper to enable multiple view types to be returned from a single function or computed property, or to let us reference a view without having to know its underlying type. Слушать в Apple Podcasts. While the above technique will work perfectly fine in many different situations, sometimes we might want to customize things further in order to achieve a specific kind of look. In-depth conversations about Swift and software development in general, hosted by John Sundell. Plus, DetailsPro also seamlessly syncs your projects across your devices, so that you can start working on your iPad, and then easily pick that same project up on the Mac, or even on your iPhone! Chris Eidhof returns to the show to go on a deep dive into the SwiftUI layout system. Importing Swift packages into a playground in Xcode 12 By John Sundell Published at 12:20 GMT, 23 Jun 2020 An exciting new feature in Xcode 12 is that Swift packages can now be directly imported into a playground. Listen on Apple Podcasts. First, let’s rename our Proxy property wrapper to AnyProxy: Then, let’s define a protocol that’ll use a type alias to specialize AnyProxy using Self. That’s really important in terms of the API’s design, since it makes the whole syste… Used for more than just app development, Swift is now used for web services, machine learning, and beyond. We'll do it lazily So while it might be easy to get started building views using it, we often have to use quite advanced techniques (like generic programming) in order to make the best use of what SwiftUI has to offer. 85: “Cross-Apple platform … Learn more at geniusscansdk.com , and mention Swift by Sundell when requesting a … 87: “The SwiftUI layout system”, with special guest Chris Eidhof. Thanks for reading! From specific utilities to general-purpose abstractions. I hope that you found this article useful. 4.7, 15 Ratings. Used for more than just app development, Swift is now used for web services, machine learning, and beyond. What’s very interesting, though, is that if we instead place the above conditional expression inline within our body property, the compiler error goes away: That’s because SwiftUI uses a function/result builder to combine all of the views that are defined within a given scope (such as the above HStack) into a single return type, and the good news is that we can use that same builder type within our own properties and functions as well. Under the hood, NSDataDetector actually uses regular expressions as well, but hides those details behind a series of dedicated APIs that let us identify tokens like links, phone numbers, and email addresses. Values will be automatically encoded and decoded to and from our underlying rawValue property, just like how enums work in that context. After all, Combine’s "values over time”-focused design is quite a perfect fit for modeling progress updates, since we want to send a number of percentage values over time, and to then end with a completion event, which is exactly what a Combine publisher does. Swift by Sundell. The latest episode of John Sundell’s podcast “Swift by Sundell” is out today, featuring the first-ever interview with Apple software engineers Holly Borla and Grace Kendall. Just look at the article's preview below - do you have any thoughts on how to achieve it? This year, however, entire apps can now be defined directly using SwiftUI, thanks to a few new additions to its API. In-depth conversations about Swift and software development in general, hosted by John Sundell. While Combine is a closed-sourced framework that’s developed internally at Apple (so I haven’t actually seen its source code), we can make a few informed guesses as to how its Published wrapper is implemented based on the above subscript. // the return statements in its body do not have matching Importing Swift packages into a playground in Xcode 12 By John Sundell Published at 12:20 GMT, 23 Jun 2020 An exciting new feature in Xcode 12 is that Swift packages can now be directly imported into a playground. The start of a new year is often an excellent time to revisit old assumptions, to clean up some long-standing technical debt, or to improve the overall suite of workflows and automation that’s used within a given project. Applying rounded corners to a UIKit or SwiftUI view | Swift by Sundell swiftbysundell.com. Listen on Apple Podcasts. Daily coverage of Apple’s WWDC 2019 conference, by John Sundell. Wrapping up 2018 on Swift by Sundell. Although UIKit itself doesn’t include any APIs for changing a given view’s corner radius, the fact that each UIView is backed by an underlying CALayer lets us use Core Animation to perform those kinds of tweaks. You should definitely read the article. Feel free to share this article if you enjoyed it, or contact me via either Twitter or email if you have any questions or comments. The overall design of the site has been tweaked in many places. Perhaps some of these tips will help you start 2021 by adding some really solid continuous integration to your project. In this case, we only want to be notified when the progress of a given URLSessionTask was updated, which can be done by implementing the following method: With the above in place, we’ll now be able use the percentage values passed into each progressHandler closure to drive any UI component that we want to use to visualize the progress of an upload — such as a ProgressView, UIProgressView, or NSProgressIndicator. Not only does DetailsPro run real SwiftUI code under the hood, which ensures that the design of your views will perfectly match how they’ll eventually get rendered within an app, it also lets you easily export that code as high-quality Swift snippets. Also, API design, GraphQL, using the standard library’s protocol-oriented design, and more. It’s free to get started, and it’s the CI tool that I personally use for all of my new projects. The good news is that Bitrise supports using the same project for multiple workflows, all that we have to do is to configure each one as a new app (but using the same repository). That way, we can associate each upload task with a given subject (just like how we previously stored each progressHandler closure) and then return that subject as a publisher using the eraseToAnyPublisher API — like this: Now all that remains is to update our URLSessionTaskDelegate implementation to send each progress value to the subject associated with the task in question, rather than calling a closure: Just like that, we can now easily perform both simpler POST requests and file uploads, with progress events, using either Combine or a closure-based API. , then feel free to get started, and loaded with features custom URLSession instance, than! Thoughts on how to handle a major paradigm shift like the move to SwiftUI to you by wonderful. That functionality to build something useful 87: “ Map is a true modern marvel—easy to pick,. 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