Swift by Sundell John Sundell Technology 5.0 • 2 Ratings; Listen on Apple Podcasts. Listen on Apple Podcasts. 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. 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. Mention Swift by Sundell when requesting a free demo to get a 20% discount on your license for a whole year. // underlying types. A look at what it means for SwiftUI to be a value-driven UI framework, and how we might need to break certain assumptions when adopting SwiftUI within our projects. Listen on Apple Podcasts. One way to do that would be to use the aforementioned approach of splitting its body property up into separate View types — which in this case could be implemented as private nested types in order to give our code a neat degree of namespacing: With the above in place, we’ll now be able to drastically simplify our main ProfileView, since we can now implement its body just by instantiating our BackgroundView and InfoView within their respective ZStack and ScrollView wrappers: However, while the above approach is definitely a great option in many cases, it sort of feels a bit “heavy” in this kind of situation — given that we both need to define multiple types just to split our code up, and that we need to pass parts of our model data down into those nested views, which can quickly end up feeling like unnecessary busywork. Listen to a podcast episode about swiftui, "This property wrapper can only be applied to classes". Email-based accounts: Email: Forgot? 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. The grand finale of the weekly article series that started Swift by Sundell. To take a look at one such case, let’s say that we’re working on an app for managing, filtering and sorting articles, which features the following Article data model: Now let’s say that a very common task within our code base is to filter various collections that each contain instances of the above model. 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). Also, API design, GraphQL, using the standard library’s protocol-oriented design, and more. 85: “Cross-Apple platform … Conclusion With features like property wrappers and function builders, Swift is moving into some very interesting new territories, by enabling us to add our own logic to various fundamental language mechanisms — like how expressions are evaluated, or how properties are … Now, while we could simply copy/paste our regular expression-based validation logic from before into our new EmailAddress type, let’s also use this opportunity to explore a different (and, if you ask me, better) way of performing our validation — by using Foundation’s NSDataDetector API. 200 weeks of Swift | Swift by Sundell swiftbysundell.com. To take a look at one type of situation in which the above pattern could be incredibly useful, let’s see if we can actually reimplement Combine’s Published property wrapper, which is often used in combination with the ObservableObject protocol to connect a class to a SwiftUI view. // Validate the passed value and either assign it to our Because although there’s a nearly endless amount of verification that we could perform as part of our CI process, sometimes all that we really need to do is to compile the project and run all of its tests. Swift by Sundell lut 2017 – Obecnie 3 lata 9 mies. Find my weekly Swift articles on swiftbysundell.com. 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. Support Swift by Sundell by checking out this sponsor: Bitrise : My favorite continuous integration service. This year, however, entire apps can now be defined directly using SwiftUI, thanks to a few new additions to its API. What’s really interesting is that if we drop the above code into a SwiftUI project, everything is actually highly likely to just keep working, unless we’re doing things like converting Published instances into publishers using their projected values (which we haven’t yet added support for), and as long as all of our @Published properties are defined within ObservableObject-conforming types. The type of that property, Category, is currently defined as an enum that looks like this: Just like how we previously overloaded the ! It would be so much nicer if we could make the compiler infer that type based on which enclosing type that our properties are being defined in. Regardless if you’re completely new to the concept of continuous integration, or if you already have an existing setup, now might be a great time to prepare each of your projects for the upcoming year by ensuring that you have some really solid verifications in place — and if you’re looking for a platform to implement your CI workflows on, then I really recommend checking out Bitrise. In SwiftUI, a component is simply called a view, and is defined through the View protocol — which only has a single property requirement, a body — which interestingly is also, in turn, a View. 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! Learn more at geniusscansdk.com , and mention Swift by Sundell when requesting a … For a much more thorough, and also more advanced, variant of the above technique, check out “Predicates in Swift”, and feel free to send me your questions and comments via either Twitter or email. Swift by Sundell John Sundell Technology 5.0 • 6 Ratings; Listen on Apple Podcasts. To make that happen, we’re going to have to use a little bit of “type system hacking”. What a good find by Sundell about Property Wrapper! Here’s an example: Depending on the server that our POST request is being sent to, we might also want to configure our URLRequest instance further, for example by giving it a Content-Type header. In-depth conversations about Swift and software development in general, hosted by John Sundell. Unfortunately, SwiftUI doesn’t include any built-in way to only round specific corners, but we could always accomplish that by either implementing a custom Shape, or a UIView that uses the maskedCorners Core Animation API that we took a look at earlier. Since we have a quite natural separation between our view’s foreground and background in this case, let’s name our properties just like that, and if we use the same some View opaque return type as SwiftUI’s built-in body property does, then we’ll end up with the following implementation: With that change in place, all that we now have to do to implement our main view is to combine our background and foreground using a ZStack — which gives us a body implementation that essentially acts as a “handoff point” between our private implementation and SwiftUI as a framework: The beauty of the above approach is that it doesn’t require us to pass any additional data around, since our entire implementation can now actually remain within a single type — while still achieving a very nice separation between our view’s various parts. 89: “Framework and SDK development”, with special guest Ellen Shapiro. 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