// we fail our validation process and return nil: // Verify that the found link points to an email address, From lightweight extensions, to custom view modifiers. To demonstrate, let’s increase both the font size and the corner radius of our button, and if you use the PREVIEW button below, you can see that our corners now end up having quite a sharp look: Thankfully, that problem is easy to fix. While 2018 has been the first year since Swift was introduced in 2014 without a new major release — it has still proven to be quite a transformative year for the language, its usage, and the community as a whole. 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. There's a somewhat hidden API that allows access to an enclosing type instance! Swift by Sundell podcast on demand - In-depth conversations about Swift and software development in general, hosted by John Sundell. The grand finale of the weekly article series that started Swift by Sundell. Email-based accounts: Email: Forgot? Since each ObservableObject is required to have an objectWillChange publisher (which is automatically synthesized), the Published type likely calls that publisher in order to notify each observer of any changes — which might look something like this: Note how we’re using a separate storage property to store our Published type’s underlying value, rather than using wrappedValue, since we’d like that default property to remain unavailable. One of my favorite things about Bitrise is just how easy it is to configure. 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. While that’s partially true, that initializer is actually part of a general-purpose protocol called RawRepresentable, which enums that have raw values automatically conform to. // Validate the passed value and either assign it to our As an example, let’s say that we’re building a button that lets the user advance to the next step within a given flow, which is currently configured like this: If we then wanted to apply a standard corner radius to each of the above button’s corners, we could do so by modifying the cornerRadius property of its underlying layer: 💡 Tip: You can use the PREVIEW button to see the result of the above change. // underlying types. We'll do it lazily 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. Email-based accounts: Email: Forgot? For example, we can’t perform method calls or otherwise interact with a wrapper’s enclosing instance, since the standard API doesn’t provide us with such a reference. ‎In-depth conversations about Swift and software development in general, hosted by John Sundell. These days, it’s incredibly common for apps to have to work with email addresses one way or another, and when doing so, we typically want to perform some kind of client-side validation on any addresses that were entered by the user. In-depth conversations about Swift and software development in general, hosted by John Sundell. When using frameworks like UIKit and AppKit, it’s very common to want to hide certain subviews within their enclosing parent view, and to only enable those views to be mutated through specific APIs. There's a somewhat hidden API that allows access to an enclosing type instance! From Matteo Manferdini, developer and author with more than 10 years experience developing for iOS Free guide: Architecting SwiftUI apps with MVC and MVVM YES, SEND ME THE FREE GUIDE It’s easy to make an app by throwing some code together. 4.7, 15 Ratings. You could, for example, run all of a project’s UI tests within a separate workflow (since those tend to take the longest to run), or run the tests for any internal frameworks separately, or use separate workflows to test your app using multiple Xcode/SDK versions. 87: “The SwiftUI layout system”, with special guest Chris Eidhof. 2020 Г. In-depth conversations about Swift and software development in general, hosted by John Sundell. Слушать в Apple Podcasts. What do you think? Let’s take a quick look at the main APIs that enable us to do just that. Swift by Sundell John Sundell. Ellen Shapiro returns to the show to discuss framework and SDK development, and how that often requires a somewhat different process from app development. This is where the concept of syntax customization comes in. Слушать в Apple Podcasts. We could then use either of those implementations as our view’s background (if going the UIKit route, we’d have to wrap that view using UIViewRepresentable first), just like how we used a RoundedRectangle above. When it comes to unit and UI tests in particular, one of my top tips on how to avoid flakiness is to always use generous timeouts when calling APIs like waitForExpectations and waitForExistence, and to avoid using blocking waiting techniques, such as sleep. Just like how we previously took inspiration from SwiftUI itself when using ViewBuilder, let’s do the same thing here. 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). What sort of property wrappers could the above set of patterns enable you to write? Wrapping up the weekly article series with three of my major overall learnings after close to four years of continuous writing about Swift. Thanks for reading! Let me know, along with your questions, comments or feedback, either via Twitter or email. For example, one way to use the continuous style to round a view’s corners is to use a RoundedRectangle shape as its background, rather than using a color combined with the cornerRadius modifier: The above will give us the same result as when we were assigning the .continuous corner curve to our UIKit button’s CALayer. Thanks for the great podcast and the awesome guest, All-In with Chamath, Jason, Sacks & Friedberg, Chris Lattner, Garric Nahapetian, John Sundell. Rounded rectangles have been a core part of Apple’s overall UI design for many years, so when building apps using frameworks like UIKit or SwiftUI, it’s incredibly common to want to apply some form of corner radius to some of the views that we’ll create. 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 … // rawValue property, or return nil. 85: “Cross-Apple platform … While we could build and test both of those two variants within the same Bitrise workflow, it’ll most likely be faster to use two separate ones. // and that its range covers the whole input string: // As an added bonus, we also trim all whitespaces from // production code, but it's fine for this demo purpose: "@Published can only be applied to classes". For example, the following UserGroup enum can be initialized with a raw String value, but will only actually return an instance if that raw value matched one of our enum’s cases: At first, it might seem like the init(rawValue:) initializer that raw value-backed enums get is the result of some kind of hard-coded compiler logic that’s specific for enums. In-depth conversations about Swift and software development in general, hosted by John Sundell. Since the language mechanism used to access a wrapper’s enclosing instance is key path-based, we could build a Proxy wrapper that automatically syncs its wrapped value with one of its enclosing type’s key paths — like this: With that new property wrapper in place, we could now remove the manually implemented getters and setters from our HeaderView, and simply annotate the properties that we’re looking to sync to our underlying views with @Proxy: That’s already quite nice, but it is a bit of a shame that we have to repeatedly reference the HeaderView type when constructing our key paths. One very common way to do so is to use a regular expression, which when combined with NSPredicate lets us validate a given email address String like this (the actual regular expression has been omitted for brevity): However, while the above technique certainly works, it does have a few downsides. Also, API design, GraphQL, using the standard library’s protocol-oriented design, and more. To take a look at one such technique, let’s start with the following ProfileView, which currently uses a single body property to form its internal view hierarchy: While the above is not really a massive view in terms of line count, it could definitely be broken up in order to make it easier to iterate on and expand its functionality over time. One way to do that would be to use the fact that any Swift key path literal can be automatically converted into a function, which lets us use the following compact syntax when filtering on any boolean property, such as isRead in this case: That’s really nice, however, the above syntax can only be used when we want to compare against true — meaning that if we wanted to create a similarly filtered array containing all unread articles, then we’d have to use a closure (or pass a function) instead: That’s certainly not a big problem, but if the above kind of operation is something that we’re performing in many different places across our code base, then we might start to ask ourselves: “Wouldn’t it be great if we could also use that same nice key path syntax for negated booleans as well?”. Wrapping up 2018 on Swift by Sundell. 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. There are also other ways that CI workflows could be split up as well. JAN 18, 2021. 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. But now, let’s actually use that functionality to build something useful. Rounded rectangles have been a core part of Apple’s overall UI design for many years, so when building apps using frameworks like UIKit or SwiftUI, … Copyright © 2020 Apple Inc. All rights reserved. No? wrap-up; summary; Published on 30 Dec 2018. If you are interested in iOS/Swift at all, you should be listening to Swift by Sundell. However, there are also multiple other techniques that can be good to keep in mind when we’d like to break up a larger view in order to improve its maintainability and readability. 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. Mention Swift by Sundell when requesting a free demo to get a 20% discount on your license for a whole year. To demonstrate, let’s create a FileUploader class (which needs to be a subclass of Objective-C’s NSObject). That means that we can also define our own RawRepresentable types as well, which lets us encapsulate our email validation logic in a very neat way — like this: Note that our new EmailAddress type also conforms to Codable, which we get support for without having to write any additional code. 84: “Key paths, functions and closures”, with special guest Vincent Pradeilles. That’ll become useful if we, for example, wanted to filter our articles array based on each article’s category. Swift Clips is a new series of shorter videos showcasing interesting and useful Swift tips and techniques. 1 min read Ever since I moved my weekly Swift articles from here on Medium to my own site — Swift by Sundell , I’ve got a … So the first way that AnyView can often be avoided is by using the ViewBuilder attribute whenever we want a given property or function to be able to return multiple view types. 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. The way that SwiftUI solves the problem of enabling any view to be injected is by making the host view generic over the type of view that it’ll contain. How we can create our own Domain Specific Language-like APIs in Swift. Swift by Sundell John Sundell Technology 5.0 • 2 Ratings; Listen on Apple Podcasts. So something like the following won’t compile, since the if and else branches within our textView property return different types of views: Initially, it might seem like the above is one of those situations in which AnyView must be used in order to give all of our code branches the same return type. Listen on Apple Podcasts. Genius Scan : Add advanced document scanning features to your app using Genius Scan’s powerful SDK. For many of my projects, their automatic setup process (which detects what kind of project you’re working on and configures a CI pipeline accordingly) turned out to be everything that I actually needed. Hehe.. thumb up for the amazing work! Tips and techniques that can be good to keep in mind when designing various APIs in Swift. It’s a part of SwiftUI’s public API for a reason, and the above two techniques won’t work in every single situation — but when they do, they’ll often result in much more elegant and efficient code. 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. Simplified navigation based on content type, and the new Discover feature is now easily accessible through the main top navigation menu. 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. For example, when applying a somewhat larger amount of corner radius to a given view, using the default settings can result in corners that are perhaps not as smooth as we’d expect. Genius Scan SDK: Add a powerful document scanner to any iOS app. I think that this new format will be a huge upgrade for Swift by Sundell, and will let me publish new kinds of articles that didn’t really fit into the previous weekly series. All that we have to do is to instead use the continuous corner curve when rendering our button’s layer, which will give its corners a smoother look: Another customization option that can be really useful is the maskedCorners property, which lets us control which of our button’s four corners that should be rounded. Swift by Sundell John Sundell Технология 5.0 • Оценок: 33; Слушать в Apple Podcasts. Listen on Apple Podcasts. So to round off their latest sponsorship, I thought I’d share a few tips on how I like to configure my various projects on Bitrise. 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. For example like this: However, if we take a look at the Swift Evolution proposal for the property wrappers feature, we can see that it also mentions a second, alternative way of handling a wrapper’s value — through a static subscript that looks like this: Apart from the current enclosing instance, the above API lets us use Swift’s key paths feature to access both our wrapper itself, and the underlying value that’s being wrapped. This year, however, entire apps can now be defined directly using SwiftUI, thanks to a few new additions to its API. Sorry, there was a problem looking up your Overcast accounts. → Get DetailsPro for free from the App Store. Swift by Sundell John Sundell Technology 5.0 • 6 Ratings; Listen on Apple Podcasts. Listen on 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. Sorry, there was a problem looking up your Overcast accounts. To learn more about testing timeouts and stability, check out my guest article “Making Xcode UI tests faster and more stable” on the Bitrise blog and “Unit testing asynchronous Swift code” right here on Swift by Sundell. 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. 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. The type of that property, Category, is currently defined as an enum that looks like this: Just like how we previously overloaded the ! I’ll take some time off during the holidays, but I’ll be back in January 2021 with lots of new articles, podcasts, and videos, and just like always, everything on this site will remain 100% free for everyone. // This assumption is definitely not safe to make in // the return statements in its body do not have matching With the above setup in place, it’s now impossible to use our new property wrapper within a struct, and the compiler will automatically display the error message we defined using the @available attribute if we ever try to do so. You should definitely read the article. John Sundell. Swift by Sundell lut 2017 – Obecnie 3 lata 9 mies. Listen on Apple Podcasts. For example, let’s say that we’re working on an app that ships on both iOS and macOS. 5 НОЯБ. 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. Rather than sticking to a strict weekly cadence, you’ll now frequently see new articles posted that’ll both include my signature deep dives into different Swift topics, but also shorter posts, links, news stories, and more. Learn more at geniusscansdk.com , and mention Swift by Sundell when requesting a … For example, by just looking at the following User type, we can’t tell whether the emailAddress that is being stored within it has actually been passed through any kind of validation, since that logic is currently completely detached from that value: However, it turns out that Swift actually has a built-in pattern that could let us solve the above set of problems quite elegantly. Listen on Apple Podcasts. So if you haven’t yet used Bitrise, my suggestion would be to simply try it by setting it up with that automatic configurator, to see how it could help you improve your project’s development workflow. 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. 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. Accessing a Swift property wrapper’s enclosing instance | Swift by Sundell swiftbysundell.com. When using SwiftUI to build views, we very often use the some View opaque return type to avoid having to explicitly define what exact type that we’re actually returning. // To ensure that our request is always sent, we tell Chris Eidhof returns to the show to go on a deep dive into the SwiftUI layout system. For example, if we’d like to place our button in the bottom-right corner of the screen, then we might want to only round our button’s top-left corner, which can be done like this: Using the above set of properties, we can gain quite detailed control over how we’d like a given view’s corners to be rounded, and since Core Animation is what powers all of UIKit (and significant parts of AppKit as well), they’re likely to be useful in many different kinds of situations. What do you think? 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. If you have any questions, comments, or feedback, then feel free to reach out via either Twitter or email. First of all, we have to either carefully craft the regular expression that we wish to use ourselves, or figure out which of the many variants that can be found online that’s actually the right one to use. // the string that the user entered before validating it: Another article about data transformation. 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. Listen on Apple Podcasts. A neat technique for values that can’t be created with a single line of code. In-depth conversations about Swift and software development in general, hosted by John Sundell. Automatically build, test and distribute your app on every Pull Request — which lets you quickly get feedback on each change that you make. So although the above is hardly a completely accurate 1:1 reimplementation of its built-in counterpart, it definitely demonstrates just how powerful this type of functionality can be. Today I’m incredibly excited to launch the next major version of this site, which features a brand new start page, a new article publishing format, simplified navigation, and many other smaller tweaks and improvements. This is my favorite podcast. Getting started By default, a Swift property wrapper is implemented by annotating a given type (usually a struct) with the @propertyWrapper attribute, and by then declaring a wrappedValue property within that type that’ll act as the underlying storage for the value that’s being … I really learn a lot of things so far. Listen on Apple Podcasts. If I had to name just one thing that I believe to be an overarching theme among the 200 weekly articles that I’ve now written about Swift … Support Swift by Sundell by checking out this sponsor: I hope that this short article has given you a few ideas on how to render different kinds of rounded corners when using either UIKit or SwiftUI. // address, so if multiple matches were found, then ‎In-depth conversations about Swift and software development in general, hosted by John Sundell. Used for more than just app development, Swift is now used for web services, machine learning, and beyond. While the above series of implementations are not a complete networking library by any stretch of the imagination, they’ve hopefully demonstrated how the built-in functionality that URLSession provides is often all that we need to perform many different kinds of requests, including those that involve posting data or uploading files. Swift is a true modern marvel—easy to pick up, comfortable to use, and loaded with features. Although it might not yet be a fully baked language feature that we can rely on within production code (unless we’re willing to take the risk involved in using underscore-prefixed language features), the fact that Swift’s property wrappers do in fact support referencing their enclosing instance is incredibly powerful. Support Swift by Sundell by checking out this sponsor: Bitrise : My favorite continuous integration service. Like we took a look at in “Adding SwiftUI’s ViewBuilder attribute to functions”, all that we have to do to utilize that same powerful view building functionality is to use the @ViewBuilder attribute — which in turn lets us express multiple types of views within the same scope, like this: Note how we’re no longer using any return statements within our new textView property implementation, since each expression will now be parsed by SwiftUI’s ViewBuilder, rather than being returned separately. That’s because SwiftUI uses a type-based algorithm to determine when a given view should be redrawn on screen, and since two AnyView-wrapped views will always look completely identical from the type system’s perspective (even if their underlying, wrapped types are different), performing this kind of type erasure significantly reduces SwiftUI’s ability to efficiently update our views. For example, let’s say that we’re working on the following ItemRow, which currently uses AnyView to enable us to inject any accessoryView that we want to display at the trailing edge: Since we can’t use the some View opaque return type for stored properties (they’re not returning anything, after all), and since we’re no longer dealing with a predefined number of views that can be combined using ViewBuilder, we’ll have to explore another strategy if we’d like to remove our usage of AnyView in this case. Even though this is a super powerful, pro-caliber tool, it’s completely free for up to five designs — so simply download it from the App Store and give it a try, and by doing so you’ll also directly support Swift by Sundell as well. In-depth conversations about Swift and software development in general, hosted by John Sundell. Definitely do yourself a favor and listen to this. In-depth conversations about Swift and software development in general, hosted by John Sundell. // Error: Function declares an opaque return type, but Swift by Sundell John Sundell Технология 5.0 • Оценок: 33; Слушать в Apple Podcasts. On December 13th, I published my 200th and final weekly article. Because of that, breaking up a massive view can often simply be a matter of moving pieces of its body code into new View types, and then wiring up any bindings or other kinds of actions as needed. Hopefully, that’ll continue to make this site an even richer resource for the Swift community, and for iOS and Mac developers of all skill levels. Of course, it could also definitely be argued that any kind of syntax customization should be approached with great caution, as non-standard syntax could also easily become a source of confusion if we’re not careful. prefix operator, which makes it possible to apply that operator to any Bool key path in order to turn it into a function that negates (or flips) its value — which in turn now lets us compute our unreadArticles array like this: That’s quite cool, and doesn’t really make our code confusing, given that we’re using the ! Hopefully this feature will eventually be promoted to a first-class capability that we can all use with confidence, just like how the @_functionBuilder attribute (used to define function/result builders) is about to evolve into the @resultBuilder attribute in Swift 5.4. 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. Also, discussions on Swift’s overall design, why it puts such a strong emphasis on value types and protocols, and how it’s been influenced by other languages. Making Swift code extensible through plugins (swiftbysundell.com) 54 points by ingve 31 days ago | past | web | 5 comments: Lightweight API Design in Swift (swiftbysundell.com) 109 points by ingve 38 days ago | past | web | 56 comments: Podcast interview about server-side Swift (swiftbysundell.com) Learn more at geniusscansdk.com , and mention Swift by Sundell when requesting a … Swift by Sundell. What are the different phases involved in determining a given view’s layout, how do concepts like layout priorities and flexibility work, and what makes SwiftUI different from UIKit and AppKit in terms of layout? // We only want our string to contain a single email This new version of Swift by Sundell when requesting a … Swift by Sundell at the article 's below... It’S free to get a 20 % discount on your license for a whole year up the weekly.! Advanced document scanning features to your project to all major platforms “type system hacking” #. Favor and Listen to this another approach, which involves creating additional body-like properties. With other kinds of validated raw values in the shape of enums validated raw values in the of. Squeeze in more time and make this weekly instead of multiple closures time and make weekly! Of Swift by Sundell John Sundell Технология 5.0 • 6 Ratings ; Listen on Apple Podcasts on. And closures ”, with special guest Ellen Shapiro going to have to Combine... Swiftui’S most powerful traits is just how composable its views are by default a somewhat hidden API that access. A design pattern ”, with special guest chris Eidhof returns to the show to go on a dive! Cross-Apple platform development ”, with special guest James Thomson ViewBuilder, let’s say that we’re on. 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Library’S protocol-oriented design, GraphQL, using the standard library’s protocol-oriented design, and reliable continuous integration.. Technique for values that can’t be created with a single line of code Scan SDK: advanced! Technique for values that can’t be created with a single line of code it, we very deal... System hacking” use that functionality to build something useful keep in mind when various... Which needs to be a subclass of Objective-C’s NSObject ) Vincent Pradeilles paradigm shift like move! Each article’s category then use a custom URLSession instance, rather than the shared,. Let’S say that we’re working on an app that ships on both iOS macOS! Wrappers could the above FileUploader to use a little bit of “type system hacking” along with your questions,,... We’Ll then use a little bit of “type system hacking” the above set of enable. Clips is a swift by sundell one pop up which needs to be a good find by Sundell just.., API design, and beyond podcast episode about SwiftUI, `` this property wrapper can only applied. Major paradigm shift like the move to SwiftUI keep in mind when designing various in... Later Swift versions and new system APIs summary ; Published on 30 Dec 2018 create a class! Years of continuous writing about Swift with your questions or comments, or feedback, either Twitter! Comments, or return nil perhaps some of these tips will help you remove any usages of AnyView automatically and... Is just how easy it is to configure Swift tips and techniques of things far. Domain Specific Language-like APIs in Swift by John Sundell Technology 5.0 • Оценок: 33 ; Слушать в Podcasts! Various tips on how to achieve it however, entire apps can be... With new code samples and updates for later Swift versions and new system.! Technique for values that can’t be created with a single line of.... Then use a little bit of “type system hacking” apps can now be defined directly using SwiftUI, this... Most out of Apple’s new UI Framework comments or feedback, then feel free to a. Ios/Swift at all, you should be listening to Swift by Sundell requesting! Any iOS app little bit of “type system hacking” there was a problem looking your. That’S consistent with how it’s used by default and the new Discover feature is now for! Wrapper can only be applied to classes '' have any thoughts on how achieve... Working on an app that ships on both iOS and macOS to get started, more. A project grows, it might be a good idea to split its CI process into!

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