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Swift for Programmers

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Swift for Programmers

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    ePub EPUB The open industry format known for its reflowable content and usability on supported mobile devices.

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  • A programming-language focused book designed to get practicing programmers up-to-speed quickly in Swift programming
  • Learn the new programming language for iOS and OS X apps that builds on the best of C and Objective-C
  • Includes code snippets and live-code examples


  • Copyright 2015
  • Dimensions: 7" x 9-1/8"
  • Pages: 400
  • Edition: 1st
  • Book
  • ISBN-10: 0-13-402136-3
  • ISBN-13: 978-0-13-402136-2

The professional programmer’s Deitel® guide to Apple’s new Swift programming language for the iOS® and OS X® platforms

Written for programmers with a background in object-oriented programming in a C-based language like Objective-C, Java, C# or C++, this book applies the Deitel signature live-code approach with scores of complete, working, real-world programs to explore the new Swift language in depth. The code examples feature syntax shading, code highlighting, rich commenting, line-by-line code walkthroughs and live program outputs. The book features thousands of lines of proven Swift code, and tips that will help you build robust applications.

Start with an introduction to Swift using an early classes and objects approach, then rapidly move on to more advanced topics. When you master the material, you’ll be ready to build industrial-strength object-oriented Swift applications.

About This Book

The Swift programming language was arguably the most significant announcement at Apple’s 2014 Worldwide Developers Conference. Although apps can still be developed in Objective-C®, Apple says that Swift is its applications programming and systems programming language of the future.

Swift is a contemporary language with simpler syntax than Objective-C. Because Swift is new, its designers were able to include popular programming language features from languages such as Objective-C, Java, C#, Ruby, Python® and many others. These features include automatic reference counting (ARC), type inference, optionals, String interpolation, tuples, closures (lambdas), extensions, generics, operator overloading, functions with multiple return values, switch statement enhancements and more. We’ve been able to develop apps more quickly in Swift than with Objective-C and the code is shorter, clearer and runs faster on today’s multi-core architectures.

Swift also eliminates the possibility of many errors common in other languages, making your code more robust and secure. Some of these error-prevention features include no implicit conversions, ARC, no pointers, required braces around every control statement’s body, assignment operators that do not return values, requiring initialization of all variables and constants before they’re used, array bounds checking, automatic checking for overflow of integer calculations, and more. You can combine Swift and Objective-C in the same app to enhance existing Objective-C apps without having to rewrite all the code. Your apps will easily be able to interact with the Cocoa®/Cocoa Touch® frameworks, which are largely written in Objective-C.

You can also use the new Xcode playgrounds with Swift. A playground is an Xcode window in which you can enter Swift code that compiles and executes as you type it. This allows you to see and hear your code’s results as you write it, quickly find and fix errors, and conveniently experiment with features of Swift and the Cocoa/Cocoa Touch frameworks.

Practical, Example-Rich Coverage of:

  • Classes, Objects, Methods, Properties
  • Initializers, Deinitializers, Bridging
  • Tuples, Array and Dictionary Collections
  • Structures, Enumerations, Closures, ARC
  • Inheritance, Polymorphism, Protocols
  • Type Methods, Type Properties
  • Generics; Strings and Characters
  • Operator Overloading, Operator Functions, Custom Operators, Subscripts
  • Access Control; Type Casting and Checking
  • Nested Types, Nested Methods
  • Optionals, Optional Chaining, Extensions
  • Xcode, Playgrounds, Intro to Cocoa Touch® with a Fully Coded iOS® 8 Tip Calculator App
  • Overflow Operators, Attributes, Patterns
  • More topics online
IMPORTANT NOTE ABOUT XCODE AND SWIFT: With Xcode 6.3 and Swift 1.2, Apple introduced several changes in Swift that affect the book's source code. Please visit www.deitel.com/books/iOS8FP1 for updated source code. The changes do not affect Xcode 6.2 users. You can download Xcode 6.2 from developer.apple.com/downloads/index.action (you’ll have to log in with your Apple developer account to see the list of downloads).


Visit www.deitel.com

  • Download code examples
  • For information on Deitel’s Dive Into® Series programming training courses delivered at organizations worldwide visit www.deitel.com/training or to deitel@deitel.com
  • Join the Deitel social networking communities on Facebook® at facebook.com/DeitelFan, Twitter® at @deitel, Google+ at google.com/+DeitelFan, LinkedIn® at bit.ly/DeitelLinkedIn, YouTube™ at youtube.com/user/DeitelTV and subscribe to the Deitel® Buzz Online e-mail newsletter at www.deitel.com/newsletter/ subscribe.html

Sample Content

Online Sample Chapter

Introduction to Classes, Objects, Methods and Functions in Swift

Sample Pages

Download the sample pages (includes Chapter 5 and Index)

Table of Contents

Preface         xix

Before You Begin         xxvii

Chapter 1: Introduction to Swift and Xcode         6 1

1.1 Introduction   2

1.2 Apple’s OS X® and iOS® Operating Systems: A Brief History   3

1.3 Objective-C   3

1.4 Swift: Apple’s Programming Language of the Future   4

1.5 Can I Use Swift Exclusively?   9

1.6 Xcode 6 Integrated Development Environment   10

1.7 Creating Swift Apps with Xcode 6   13

1.8 Web Resources   18

Chapter 2: Introduction to Swift Programming         20

2.1 Introduction   21

2.2 A First Swift Program: Printing a Line of Text   21

2.3 Modifying Your First Program   23

2.4 Composing Larger Strings with String Interpolation   25

2.5 Another Application: Adding Integers   27

2.6 Arithmetic   28

2.7 Decision Making: The if Conditional Statement and the Comparative Operators   29

2.8 Wrap-Up   32

Chapter 3: Introduction to Classes, Objects, Methods and Functions          33

3.1 Introduction   34

3.2 Account Class   35

3.3 Creating and Using Account Objects   40

3.4 Value Types vs. Reference Types   45

3.5 Software Engineering with Access Modifiers   46

3.6 Wrap-Up   47

Chapter 4: Control Statements; Assignment, Increment and Logical Operators           48

4.1 Introduction   49

4.2 Control Statements   49

4.3 if Conditional Statement   50

4.4 if…else Conditional Statement   50

4.5 Compound Assignment Operators   52

4.6 Increment and Decrement Operators   53

4.7 switch Conditional Statement   55

4.8 while Loop Statement   57

4.9 do…while Loop Statement   58

4.10 for…in Loop Statement and the Range Operators   58

4.11 for Loop Statement   63

4.12 break and continue Statements   64

4.13 Logical Operators   66

4.14 Wrap-Up   69

Chapter 5: Functions and Methods: A Deeper Look; enums and Tuples         70

5.1 Introduction   71

5.2 Modules in Swift   72

5.3 Darwin Module–Using Predefined C Functions   73

5.4 Multiple-Parameter Function Definition   74

5.5 Random-Number Generation   76

5.6 Introducing Enumerations and Tuples   77

5.7 Scope of Declarations   84

5.8 Function and Method Overloading   86

5.9 External Parameter Names   88

5.10 Default Parameter Values   89

5.11 Passing Arguments by Value or by Reference   90

5.12 Recursion   92

5.13 Nested Functions   93

5.14 Wrap-Up   95

Chapter 6: Arrays and an Introduction to Closures         96

6.1 Introduction   97

6.2 Arrays   98

6.3 Creating and Initializing Arrays   99

6.4 Iterating through Arrays   101

6.5 Adding and Removing Array Elements   104

6.6 Subscript Expressions with Ranges   107

6.7 Sorting Arrays; Introduction to Closures   108

6.8 Array Methods filter, map and reduce   112

6.9 Card Shuffling and Dealing Simulation; Computed Properties; Optionals   116

6.10 Passing Arrays to Functions   121

6.11 Notes on Pass-By-Value and Pass-By-Reference   124

6.12 Multidimensional Arrays   124

6.13 Variadic Parameters   128

6.14 Wrap-Up   129

Chapter 7: Dictionary         131

7.1 Introduction   132

7.2 Declaring a Dictionary: Key—Value Pairs and Dictionary Literals   134

7.3 Declaring and Printing Empty Dictionary Objects   136

7.4 Iterating through a Dictionary with for…in   137

7.5 General-Purpose Generic Dictionary Printing Function   139

7.6 Dictionary Equality Operators == and !=   140

7.7 Dictionary count and isEmpty Properties   141

7.8 Dictionary Whose Values Are Arrays   142

7.9 Dictionary’s keys and values Properties   143

7.10 Inserting, Modifying and Removing Key—Value Pairs with Subscripting   145

7.11 Inserting, Removing and Modifying Key—Value Pairs   148

7.12 Building a Dictionary Dynamically: Word Counts in a String   151

7.13 Bridging Between Dictionary and Foundation Classes   153

7.14 Hash Tables and Hashing   154

7.15 Wrap-Up   155

Chapter 8: Classes: A Deeper Look and Extensions         157

8.1 Introduction   158

8.2 Time Class: Default Initializers and Property Observers   160

8.3 Designated and Convenience Initializers in Class Time   166

8.4 Failable Initializers in Class Time   170

8.5 Extensions to Class Time   174

8.6 Read-Write Computed Properties   178

8.7 Composition   181

8.8 Automatic Reference Counting, Strong References and Weak References   184

8.9 Deinitializers   185

8.10 Using NSDecimalNumber for Precise Monetary Calculations   185

8.11 Type Properties and Type Methods   187

8.12 Lazy Stored Properties and Delayed Initialization   191

8.13 Wrap-Up   192

Chapter 9: Structures, Enumerations and Nested Types         194

9.1 Introduction   195

9.2 Structure Definitions   196

9.3 Enumerations and Nested Types   202

9.4 Choosing Among Structures, Enumerations and Classes in Your Apps   209

9.5 Associated Values for enums  210

9.6 Wrap-Up   212

Chapter 10: Inheritance, Polymorphism and Protocols   214

10.1 Introduction 215

10.2 Superclasses and Subclasses   217

10.3 An Inheritance Hierarchy: CommunityMembers   218

10.4 Case Study: Using Inheritance to Create Related Employee Types   218

10.5 Access Modifiers in Inheritance Hierarchies 226

10.6 Introduction to Polymorphism: A Polymorphic Video Game Discussion   227

10.7 Case Study: Payroll System Class Hierarchy Using Polymorphism   228

10.8 Case Study: Creating and Using Custom Protocols   238

10.9 Additional Protocol Features   246

10.10 Using final to Prevent Method Overriding and Inheritance   248

10.11 Initialization and Deinitialization in Class Hierarchies   248

10.12 Wrap-Up   251

Chapter 11: Generics         253

11.1 Introduction   254

11.2 Motivation for Generic Functions   254

11.3 Generic Functions: Implementation and Specialization   255

11.4 Type Parameters with Type Constraints   258

11.5 Overloading Generic Functions   259

11.6 Generic Types   259

11.7 Note About Associated Types for Protocols   263

11.8 Wrap-Up   263

Chapter 12: Operator Overloading and Subscripts          264

12.1 Introduction   265

12.2 String Operators and Methods   266

12.3 Custom Complex Numeric Type with Overloaded Arithmetic Operators   271

12.4 Overloading Arithmetic Operators for Class NSDecimalNumber   274

12.5 Overloading Unary Operators: ++ and --   276

12.6 Overloading Subscripts   279

12.7 Custom Operators   283

12.8 Custom Generic Operators   286

12.9 Wrap-Up   287

Chapter 13: iOS 8 App Development: Welcome App         288

13.1 Introduction   289

13.2 Technologies Overview   290

13.3 Creating a Universal App Project with Xcode   291

13.4 Xcode Workspace Window   293

13.5 Storyboarding the Welcome App’s UI   296

13.6 Running the Welcome App   308

13.7 Making Your App Accessible   311

13.8 Internationalizing Your App   313

13.9 Wrap-Up   318

Chapter 14: iOS 8 App Development: Tip Calculator App         319

14.1 Introduction   320

14.2 Test-Driving the Tip Calculator App in the iPhone and iPad Simulators   321

14.3 Technologies Overview   322

14.4 Building the App’s UI   325

14.5 Creating Outlets with Interface Builder   337

14.6 Creating Actions with Interface Builder   340

14.7 Class ViewController   341

14.8 Wrap-Up   349

Appendix A: Keywords         351

Appendix B: Operator Precedence Chart         352

Appendix C: Labeled break and continue Statements         354

C.1 Introduction   354

C.2 Labeled break Statement   354

C.3 Labeled continue Statement   355

Index         357


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