Gray A. - Swift Pocket Reference: Programming for iOS and OS X
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Get quick answers for developing and debugging applications with Swift, Apples multi-paradigm programming language. Updated to cover the latest features in Swift 2.0, this pocket reference is the perfect on-the-job tool for learning Swifts modern language features, including type safety, generics, type inference, closures, tuples, automatic memory management, and support for Unicode.Designed to work with Cocoa and Cocoa Touch, Swift can be used in tandem with Objective-C, and either language can call APIs implemented in the other. Swift is still evolving, but Apple clearly sees it as the future language of choice for iOS and OS X software development.Topics include:
Supported data types, such as strings, arrays, array slices, sets, and dictionaries;
Program flow: loops, conditional execution, and error handling;
Classes, structures, enumerations, and functions;
Protocols, extensions, and generics;
Memory management;
Closures: similar to blocks in Objective-C and lambdas in C#;
Optionals: values that can explicitly have no value;
Operators, operator overloading, and custom operators;
Access control: restricting access to types, methods, and properties;
Ranges, intervals, and strides;
A full list of built-in global functions and their parameter requirements.
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by Anthony Gray
Copyright 2016 Anthony Gray. All rights reserved.
Printed in the United States of America.
Published by OReilly Media, Inc. , 1005 Gravenstein Highway North,
Sebastopol, CA 95472.
OReilly books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (http://safaribooksonline.com). For more information, contact our corporate/institutional sales department: 800-998-9938 or corporate@oreilly.com .
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- Cover Designer: Randy Comer
- Illustrator: Rebecca Demarest
- December 2014: First Edition
- November 2015: Second Edition
- 2015-11-11: First Release
See http://oreilly.com/catalog/errata.csp?isbn=9781491940075 for release details.
While the publisher and the author have used good faith efforts to ensure that the information and instructions contained in this work are accurate, the publisher and the author disclaim all responsibility for errors or omissions, including without limitation responsibility for damages resulting from the use of or reliance on this work. Use of the information and instructions contained in this work is at your own risk. If any code samples or other technology this work contains or describes is subject to open source licenses or the intellectual property rights of others, it is your responsibility to ensure that your use thereof complies with such licenses and/or rights.
978-1-491-94007-5
[M]
Swift is an exciting new language from Apple, first announced at the Apple Worldwide Developers Conference (WWDC) in June 2014. The language started life as the brainchild of Chris Lattner, director of Apples Developer Tools department, and is the next step in the evolution of Apples software development ecosystem.
Swift brings with it many modern language features, including type safety, generics, type inference, closures, tuples, protocols, automatic memory management, and support for Unicode (for character and string values as well as for identifiers). You can use a mixture of Swift and Objective-C in a single project, and either language can call APIs implemented in the other.
The challenge for anyone learning or writing about Swift is that the language is still evolving. When they introduced it, Apple stated that the language specification was not final, and that the syntax and feature set would change. Since the initial release, there have been two significant updates (versions 1.2 and 2.0), both of which introduced new features, and in some cases changed existing features. Fortunately, Xcode can detect most of the cases where your code is using an older syntax or feature, and offers hints at what to change to address this.
Despite the uncertainty of a changing language, Swift continues to show great promise. It follows on from the companys other major developer tools initiatives (all led by Lattner) including LLVM, Clang, LLDB, ARC, and a series of extensions to Objective-C, and its clear that Apple sees it as the future language of choice for iOS and OS X software development.
The following typographical conventions are used in this book:
ItalicIndicates new terms, URLs, email addresses, filenames, and file extensions.
Constant widthUsed for program listings, as well as within paragraphs to refer to program elements such as variable or function names, databases, data types, environment variables, statements, and keywords.
Constant width boldShows commands or other text that should be typed literally by the user.
Constant width italicShows text that should be replaced with user-supplied values or by values determined by context.
This element signifies a general note.
You can download code samples that accompany this book at https://github.com/adgray/SwiftPocketReference2ndEd .
This book is here to help you get your job done. In general, if example code is offered with this book, you may use it in your programs and documentation. You do not need to contact us for permission unless youre reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.
We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: Swift Pocket Reference by Anthony Gray (OReilly). Copyright 2016 Anthony Gray, 978-1-491-94007-5.
If you feel your use of code examples falls outside fair use or the permission given above, feel free to contact us at .
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I would like to thank fellow OReilly author Paris Buttfield-Addison for urging me (repeatedly) to write this book. He and his partner-in-crime, Jon Manning, suffer from boundless optimism and seem to regard no as a challenge rather than as a defeat. Id also like to thank Rachel Roumeliotis and the other fine folk at OReilly for having faith in me and for shepherding the project (and the update) through to completion. Special thanks also go to the readers of the early release editions, who took the time to provide feedback and suggestions for improvement, for which Im deeply grateful.
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