Objc Advanced Swift Update Swift 5 - Programming Ebook

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Thursday, June 6, 2019

Objc Advanced Swift Update Swift 5

Objc Advanced Swift Update Swift 5
Objc Advanced Swift Update Swift 5


Book Details 
             TitleAdvanced Swift Update Swift 5
      ISBN-10942878347
         AuthorChris Eidhof, Ole Begemann, and Airspeed Velocity
    Language: English
        SubjectSwift / Computers & Technology / Programming / Apple Programming
No. of pages: 431
         Format: PDF, EPUB, Mobile, Source code


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Introduction


Advanced Swift is quite a bold title for a book, so perhaps we should start with what we mean by it.
When we began writing the first edition of this book, Swift was barely a year old. We did so before the beta of 2.0 was released — albeit tentatively, because we suspected the language would continue to evolve as it entered its second year. Few languages — perhaps no other language — have been adopted so rapidly by so many developers.

But that left people with unanswered questions. How do you write “idiomatic” Swift? Is there a correct way to do certain things? The standard library provided some clues, but even that has changed over time, dropping some conventions and adopting others. Since its introduction nearly five years ago, Swift has evolved at a high pace, and it has become clearer what idiomatic Swift is.

To someone coming from another language, Swift can resemble everything they like about their language of choice. Low-level bit twiddling can look very similar to (and can be as performant as) C, but without many of the undefined behavior gotchas. The lightweight trailing closure syntax of map or 􏰀lter will be familiar to Rubyists. Swift generics are similar to C++ templates, but with type constraints to ensure generic functions are correct at the time of definition rather than at the time of use. The flexibility of higher-order functions and operator overloading means you can write code that’s similar in style to Haskell or F#. And the @objc and dynamic keywords allow you to use selectors and runtime dynamism in ways you would in Objective-C.

Given these resemblances, it’s tempting to adopt the idioms of other languages. Case in point: Objective-C example projects can be almost mechanically ported to Swift. The same is true for Java or C# design patterns and most functional programming patterns.

But then comes the frustration. Why can’t we use protocol extensions with associated types like interfaces in Java? Why are arrays not covariant in the way we expect? Why can’t we write “functor?” Sometimes the answer is because the part of Swift in question isn’t yet implemented. But more often, it’s either because there’s a different Swift-like way to do what you want to do, or because the Swift feature you thought was like the equivalent in some other language is, in reality, not quite what you think.

Swift is a complex language — most programming languages are. But it hides that complexity well. You can get up and running developing apps in Swift without needing to know about generics or overloading or the difference between static and dynamic dispatch. You can certainly use Swift without ever calling into a C library or writing your own collection type, but after a while, we think you’ll find it necessary to know about these things — whether to improve your code’s performance, or to make it more elegant or expressive, or just to get certain things done.

Learning more about these features is what this book is about. We intend to answer many of the “How do I do this?” or “Why does Swift behave like that?” questions we’ve seen come up again and again on various forums. Hopefully, once you’ve read our book, you’ll have gone from being aware of the basics of the language to knowing about many advanced features and having a much better understanding of how Swift works. Being familiar with the material presented is probably necessary, if not sufficient, for calling yourself an advanced Swift programmer.

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