Swift 4入门指南：操场上的Swift语言探索

Swift

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Introduction

By Ray Fix

Welcome to the Swift Apprentice, fully updated for Swift 4.2!

In the last four years, Swift has gone from being a secret project at Apple, Inc. to a full-

blown, open source community driven language. It continues to reﬁne its core goal of

being a general purpose language that supports safety, speed and expressiveness.

Despite its advanced, industrial-strength nature, Swift is a great choice for the

beginning programmer, since Xcode offers a sandbox-type environment where you can

directly execute Swift statements to try out various components of the language —

without having to create a whole app ﬁrst.

Developers around the world use Swift to build thousands of amazing apps for the

iPhone, iPad, macOS, Apple TV and the Apple Watch. That means what you learn in this

book will be extremely useful as you expand your development skills and possibly work

as an app developer someday.

You'll learn about basic things like constants, values and types, move up to more

complicated items such as data structures, classes and enumerators, and ﬁnish off with

some in-depth knowledge about protocol extensions, custom operators and protocol-

oriented programming, many which are topics common to other programming

languages, and some that Swift improves upon in novel ways.

Swift is also a lot of fun! It's easy to try out small bits of code and play around with

different values as you test new ideas. Programming is a hands-on experience, and Swift

makes it fast and easy to both follow along with this book, as well as explore on your

own.

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somewhere inside your app: “Artwork/images/designs: from Swift Apprentice book,

available at www.raywenderlich.com”.

• The source code included in Swift Apprentice is for your personal use only. You are

NOT allowed to distribute or sell the source code in Swift Apprentice without prior

authorization.

• This book is for your personal use only. You are NOT allowed to sell this book

without prior authorization, or distribute it to friends, coworkers or students; they

would need to purchase their own copies.

All materials provided with this book are provided on an “as is” basis, without warranty

of any kind, express or implied, including but not limited to the warranties of

merchantability, ﬁtness for a particular purpose and noninfringement. In no event shall

the authors or copyright holders be liable for any claim, damages or other liability,

whether in an action of contract, tort or otherwise, arising from, out of or in connection

with the software or the use or other dealings in the software.

All trademarks and registered trademarks appearing in this guide are the properties of

their respective owners.

Acknowledgments

We would like to thank many people for their assistance in making this book possible:

• Janie Clayton For her previous work on the ﬁrst, second and third editions of Swift

Apprentice.

• Our families: For bearing with us in this crazy time as we worked all hours of the

night to get this book ready for publication!

• Everyone at Apple: For producing the amazing hardware and software we know and

love, and for creating an exciting new programming language that we can use to

make apps for that hardware!

• The Swift Community For all the people, both inside and outside of Apple, who

have worked very hard to make Swift the best computer language in the world.

• And most importantly, the readers of raywenderlich.com — especially you! Thank

you so much for reading our site and purchasing this book. Your continued

readership and support is what makes all of this possible!

Swift Apprentice Introduction

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