Swift™ for Programmers Deitel® Developer Series

1 swift FOR Programmers DEITEL Developer SERIESMany of the designations used by manufacturers and sellers to distinguish their products are claimed as those designations appear in this book, and the publisher was aware of a trademark claim, the designations havebeen printed with initial capital letters or in all authors and publisher have taken care in the preparation of this book, but make no expressed or implied warrantyof any kind and assume no responsibility for errors or omissions. No liability is assumed for incidental or consequentialdamages in connection with or arising out of the use of the information or programs contained information about buying this title in bulk quantities, or for special sales opportunities (which may include elec-tronic versions; custom cover designs.)

2 And content particular to your business, training goals, marketing focus, orbranding interests), please contact our corporate sales department at or (800) government sales inquiries, please contact For questions about sales outside the , please contact Visit us on the web: of Congress Cataloging-in-Publication DataOn file 2015 Pearson Education, rights reserved. Printed in the United States of America. This publication is protected by copyright, and permissionmust be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval system, or transmis-sion in any form or by any means, electronic, mechanical, photocopying, recording, or likewise.

3 To obtain permissionto use material from this work, please submit a written request to Pearson Education, Inc., Permissions Department,One Lake Street, Upper Saddle River, New Jersey 07458, or you may fax your request to (201) : 978-0-13402136-2 ISBN-10: 0-13-402136-3 Text printed in the United States at Edwards Brothers Malloy in Ann Arbor, Michigan. First printing, January 2015 swift FOR Programmers DEITEL Developer SERIESPaul Deitel Harvey DeitelDeitel & Associates, Saddle River, NJ Boston Indianapolis San FranciscoNew York Toronto Montreal London Munich Paris Madrid Capetown Sydney Tokyo Singapore Mexico CityDeitel Series PageDeitel Developer SeriesAndroid for Programmers : An App-Driven Approach, 2/E, Volume 1C for Programmers with an Introduction to C11C++11 for ProgrammersC# 2012 for ProgrammersiOS 8 for Programmers .

4 An App-Driven Approach with swift , Volume 1 Java for Programmers , 3/E JavaScript for ProgrammersSwift for ProgrammersHow To Program SeriesAndroid How to Program, 2/EC++ How to Program, 9/EC How to Program, 7/EJava How to Program, Early Objects Version, 10/EJava How to Program, Late Objects Version, 10/EInternet & World Wide Web How to Program, 5/EVisual Basic 2012 How to Program, 6/EVisual C# 2012 How to Program, 5/ESimply SeriesSimply C++: An App-Driven Tutorial ApproachSimply Java programming : An App-Driven Tu t o r i a l A p p r o a c h(continued in next column)(continued from previous column)Simply C#: An App-Driven Tutorial ApproachSimply Visual Basic 2010: An App-Driven Approach, 4/ECourseSmart Web ++ How to Program, 8/E and 9/ESimply C++: An App-Driven Tutorial ApproachJava How to Program, 9/E and 10/ESimply Visual Basic 2010.

5 An App-Driven Approach, 4/EVisual Basic 2012 How to Program, 6/EVisual Basic 2010 How to Program, 5/EVisual C# 2012 How to Program, 5/EVisual C# 2010 How to Program, 4/ELiveLessons Video Learning App Development Fundamentals, 2/eC++ FundamentalsJava Fundamentals, 2/e C# 2012 Fundamentals C# 2010 FundamentalsiOS 8 App Development Fundamentals, 3/eJavaScript FundamentalsSwift FundamentalsTo receive updates on Deitel publications, Resource Centers, training courses, partner offers and more, please join the Deitel communities on Facebook Twitter @deitel Google+ +DeitelFan YouTube LinkedIn register for the free Deitel Buzz Online e-mail newsletter at: To communicate with the authors, send e-mail to: For information on Dive-Into Series on-site seminars offered by Deitel & Associates, Inc.

6 Worldwide, write to us at or visit: continuing updates on Pearson/Deitel publications the Deitel Resource Centers that will help you master programming languages, software develop-ment, Android and iOS app development, and Internet- and web-related topics: In Loving Memory of Aunt Rochelle Deitel: The most positive person we ever knew. You brought joy to our lives. Harvey, Barbara, Paul and AbbeyTrademarks DEITEL, the double-thumbs-up bug and DIVE-INTO are registered trademarks of Deitel & Associates, , iOS, iPhone, iPad, iPod touch, Xcode, swift , Objective-C, Cocoa and Cocoa Touch are trade-marks or registered trademarks of Apple, is a registered trademark of Oracle and/or its affiliates.

7 Other names may be trademarks of their respective this book, trademarks are used. Rather than put a trademark symbol in every occurrence of a trademarked name, we state that we are using the names in an editorial fashion only and to the benefit of the trademark owner, with no intention of infringement of the You Beginxxvii1 Introduction to swift and Xcode 6 s OS X and iOS Operating Systems.

8 A Brief History : Apple s programming language of the Future Features of Many Popular Languages Prevention Standard Library Apps and the Cocoa and Cocoa Touch Frameworks and Objective-C Interoperability Apple swift Resources I Use swift Exclusively?

9 Programmers Who Are Developing New iOS and OS X Apps Programmers Who Are Enhancing Existing iOS and OS X Apps , C++ and C# Programmers Who Are New to iOS and OS X App Development language Changes Expected Mixture of swift and Objective-C 6 Integrated Development Environment swift Apps with Xcode 6 Resources 182 Introduction to swift programming First swift Program.

10 Printing a Line of Text Your First Program Larger Strings with String Interpolation Application: Adding Integers Arithmetic Overflow Checking Precedence Making: The if Conditional Statement and the Comparative Operators 323 Introduction to Classes, Objects.