Swift 4编程实战指南：50任务带你提升效率

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《Packt.Swift.4.Programming.Cookbook.2017》是一本专为Swift 4开发者编写的实践指南，由Keith Moon撰写。本书旨在提供50个任务导向的编程配方，帮助读者更高效地利用Swift 4进行iOS开发。作为2017年9月首次出版的作品，它涵盖了Swift 4语言的新特性和最佳实践，适合那些希望深入理解和掌握Swift 4技术的专业人士。本书的核心内容围绕实用技巧和解决方案展开，旨在通过具体的例子教会读者如何解决日常开发中遇到的问题，包括但不限于数据结构与算法、网络编程、性能优化、界面设计和模块化编程等方面。每个任务式配方都包含清晰的步骤和详细的代码示例，便于读者在实践中快速上手和提升技能。版权方面，该书受到Packt Publishing严格的版权保护，未经许可，不得任何形式的复制、存储或传输。尽管作者和出版社努力确保信息的准确性，但书中提供的内容并不构成法律保证，且不承担因本书导致的直接或间接损害的责任。在出版信息方面，本书的生产参考号为1260917，体现了其作为 Packt Publishing 出版的一部权威作品，反映了当时的最新技术和潮流。通过查阅这本书，开发者不仅可以紧跟Swift 4的步伐，还能了解到其在iOS开发中的具体应用，提升自己的专业水平。《Packt.Swift.4.Programming.Cookbook.2017》是一本实用的Swift 4编程手册，无论是对于初学者还是经验丰富的开发者，都能从中找到有价值的参考资料和实战案例，加速学习过程，提高开发效率。

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How to do it...

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See also

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Chapter 8: Performance and Responsiveness in Swift

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Introduction

328

Value and reference semantics

329

Getting ready

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How to do it...

329

How it works...

332

See also

339

Dispatch Queues

339

Getting ready

340

How to do it...

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How it works...

343

See also

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Concurrent queues and dispatch groups

345

Getting ready

345

How to do it...

345

How it works...

349

See also

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Operations

351

Getting ready

351

How to do it...

352

How it works...

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There's more...

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See also

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Index

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Preface

Since Apple announced the Swift programming language at WWDC 2014, it has gone on to

become one of the fastest growing programming languages. Swift is modern, open source,

and easy to use, and therefore Swift's usefulness can extend beyond Apple's ecosystem,

giving it the potential to be used across all platforms and for any scenario.

Swift 4 represents the latest version of this exciting new programming language, giving you

the tools to build performant and responsive apps, with safe and clean code.

This book will guide you through Swift's features, building up your knowledge and toolset

layer by layer, so you can use Swift to build the next great app or service.

You will be given useful, easy-to-follow recipes for using Swift to accomplish real-world

tasks. Each recipe only uses concepts previously covered in the book, so you will never feel

lost.

Learn what makes Swift one of the fastest growing and most exciting programming

languages available today.

What this book covers

Chapter 1, Swift Building Blocks, introduces you to the basic building blocks of Swift 4, its

syntax, and the functionalities of basic Swift constructs. Also, this chapter will introduce

you to Apple’s Xcode 9 IDE and Swift Playgrounds, which provide an ideal way to create,

execute, debug, and understand the recipes contained in this book, thus setting you up to

initiate the development process. In this chapter, learn to write your first Swift program and

understand the various basic elements of the Swift language.

Chapter 2, Building on the Building Blocks, teaches the reader to create more complex

structures on the basis of the building blocks that you studied in the first chapter and the

functionalities provided by the Swift standard library. You will get an understanding of

how to bundle the variables into tuples, order the data with the help of an array, and store

key-value pairs with Dictionaries. Also, you can learn to use the property observers and

control the access to and visibility of your code. Then, you will also learn to extend the

functionalities of your codes using the extensions.

Preface

[ 2 ]

Chapter 3, Data Wrangling with Swift Control Flow, says that programming is all about

making decisions; therefore, this chapter explores how to make a decision on the basis of

information gained and how to alter the control flow of the code. You can learn how to

conditionally execute code withif/else statements, control the flow of execution of your

code with switch statements, and then loop the code by understanding how to use the for

and while loops. Then, you will understand how to handle Swift errors with the try,

throw, do, and catch statements, and also how a defer statement can be useful to change

state once a function's execution is complete or to clean up values that are no longer needed.

Chapter 4, Generics, Operators, and Nested Types, provides you with an understanding of two

of the advanced features of Swift, which are generics and operators. Using these features,

you can learn to build functionalities that are flexible and well defined, and also understand

how nested types allow logical grouping, access, and namespacing for your constructs.

Chapter 5, Beyond the Standard Library, takes you on a journey to explore the functionalities

beyond the standard library, provided by frameworks such as Foundation and UIKit.

Learning to use these functionalities will help you make full use of the Swift language.

Chapter 6, Swift Playgrounds, gives a total understanding of using Swift Playgrounds and

explores advanced features, apart from those explored in the initial chapters, to create fully

interactive experiences.

Chapter 7, Server-Side Swift, covers a totally different aspect of Swift programming, server-

side programming with Swift. Also, you can gain an understanding of how to run Swift on

Linux by installing the Swift toolchain, learn to use a web server framework to build a REST

API, and host your API via a hosting service. Also, you can learn to accomplish your tasks

easily by understanding how to use Vapor, one of the most popular frameworks in Swift 4.

Chapter 8, Performance and Responsiveness in Swift, concludes the book by exploring the

more advanced concepts of Swift programming to gain an understanding of how certain

Swift types are implemented and their performance characteristics. Also, it explains how to

perform asynchronous tasks using Grand Central Dispatch. Then, it explores the

multithreaded environment available on all Apple platforms and how to enhance the

performance profile of your Swift constructs to build a fast and responsive app.

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