will soon learn—what an array is. And then produces the string that we pass down into the frameworks. by pretty much every Swift app out there. CGColorCreateGenericRGB as well as all of the other many, many different ways to create colors, these are now initializers with argument labels. Let's read this out remove at the position of former friend. to consider the possibility of nil everywhere. entity’s role. and of course CGContextAddPath, ContextPath and all. Optionally, continue with one or more paragraphs and bullet Although Swift Avoid abbreviations. We name based on the actions taken. Well, we know from the static type system. In this case, the act of writing the documentation comment That's CGAffineTransformMakeTranslation as well as CGAffineTransformMakeRotation on all of these. for common Objective-C idioms such as completion handlers. And if two APIs that share the same compound name. Good API design is always focused on the use site. And so here we can ask for the background title of a button. Protocols that describe a capability You just write everything in terms of the Swift names and you stay in that set of names. Describe the thing that is being returned. start with the following keywords: Include all the words needed to avoid ambiguity for a person And that includes the base name of the method as well as the argument label. r/iOSProgramming: A subreddit to share articles, code samples, open source projects and anything else related to iOS, macOS, watchOS, or tvOS … x.isEmpty, We can feel it when we look at the language. And we will be focusing on the Swift use site, So we add NS Swift Name and we use typename.membername in order, to tell the Swift compiler that kCGColorWhite should be imported, And of course, the Swift use site can now use the properly. keep the abstraction clear. So in the first case we have the word child is applying to this view argument that is our first argument. You can look at the generated interface. So when we import, we just import it directly. It is better to name a contiguous data structure Array than to If we read it out, you add the child sidebar at the origin. You also use first argument labels if you essentially can't form a grammatical phrase because it would be misleading to have the first argument in there. That makes it harder to understand. And at Apple, we're not big fans of leaks. That is, when the compiler sees myArtist.Name it maps it directly to the corresponding C function without calling any wrappers or intermediaries or overlays. So, this is a little screen shot of a small Swift app called Lister we've been shipping for a couple years. Now, with Objective-C, the APIs were already object-oriented. There's the word item that's part of our name. And so the strong static type system is making sure that the argument you passed to remove is an element of the corresponding collection. This API is going to take CGPoints. /// Creates an instance having the nearest representable. use a simplified term such as List, even though a beginner To decide among them, a user needs to There is a long debate going on the internet, about the best ways to design the APIs, and is one of the most nuanced. And the answer comes down to the character of the language. violated. it works for methods, classes, protocols. “sin(x)” has been in common use among programmers for decades, But I've made my first mistake. For all other declarations, describe what the declared entity is. Now, when you're coming up with first argument labels, again, you want that use case to read grammatically. So, we're going to talk about usage first. /// **Returns** a `List` containing `head` followed by the elements. It is a powerful API. Therefore, an API should use You can also import as an instance member. Learn how Swift 3 imports Objective-C APIs and how to expose rich Swift interfaces for existing Objective-C libraries. But as Doug explained, they were designed for a different language. When designing our API, our code will naturally be compact through certain features of the language itself, but we shouldn’t try to explicitly make this so in our design decisions. mental model. And of course, if the type context is clear, Now Core Graphics has a lot of different global functions. You don't have to care what that Objective-C name is. So, when you name a method, name it based on its side effects. The first argument should always be the source of the conversion. Instead, strive to choose a name that expresses the They feel a bit not-Swifty. And starting thinking in Swift 3. Now, then we're going to talk about the Grand Renaming. Finally, we're going to talk about some new tools and tricks that we have for mapping C and Objective-C APIs into beautiful Swift APIs. Okay. Name variables, parameters, and associated types according to You hear it a lot. where you get clear code that is concise. updating an instance in-place. So, let's revisit the code from before. So we can just say, remove(ted) from the list of friends. So this is removing specifically some element. and a developer would catch it right away. And of course, the compiler will validate, that that property exists, that it's exposed to Objective-C. and get the right Objective-C name for it. So, the Swift API Design Guidelines go a different route. likely to do a web search and find its traditional meaning. which is some local variable with a type. value preserving type conversion. malifischerlevine1 added API Design Guidelines in Swift to Delivered Board Treehouse iOS Content Roadmap. And that includes the base name of the method as well. For more information, visit the page for this site at developer.apple.com and check out Swift.org, the homepage of the open source Swift project where you can see all of the Swift evolution. period. Protocol to the protocol name: Compensate for weak type information to clarify a parameter’s role. Within a particular programming domain, such as mathematics, a So, we have method names and we have types. Any, Talk through some of them to try to get a sense of how to build great Swift APIs. There's a lot of redundant type information. It reads really nicely. So if you write or paste in some code from Swift 2, it'll recognize the old API names and give you diagnostics with Fix-its to update your code so you can get moving faster. you want that use case to read grammatically. Now, neither of these functions are too complicated, and the details don't matter. * Returns * * with this struct absolutely, completely bananas the origin here... 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