掌握Swift 2编程：创建iOS与OSX应用的深度指南

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"《精通Swift 2》是一本深入讲解Apple最新编程语言Swift 2的专业开发书籍。作者Jon Hoffman以其丰富的经验，引领读者探索如何利用Swift 2创建出卓越的iOS和macOS应用。该书是针对Swift 2.0版本编写的，适用于那些希望提升技能、紧跟技术潮流的开发者。本书由Packt Publishing出版，版权受到保护，未经许可，禁止任何形式的复制、存储或传输，除非在学术引用中进行短小摘录。作者和出版社对其准确性进行了尽职的核查，但声明书中提供的信息不带有任何明示或暗示的保修，也不承担因本书导致的直接或间接损失的责任。值得注意的是，尽管 Packt Publishing 在提及所有公司和产品时尽力使用正确的商标表示，但不能保证这些信息的绝对准确。因此，读者在参考时需自行核实。《Mastering Swift 2》是一份宝贵的资源，适合希望通过最新Swift技术打造高质量应用的开发者，无论是初学者还是进阶者，都能从中受益匪浅。" 在阅读这本书时，读者可以期待深入学习Swift 2的关键特性和改进，如类型推断、可选类型、泛型、枚举优化等新特性。此外，书中还将涵盖Swift编程的最佳实践，如错误处理、性能优化、模块化开发以及与Objective-C的集成。通过实例项目和实战演练，读者将有机会提升自己的编程技能，更好地适应Apple生态系统的开发需求。无论你是Swift新手，还是希望深化对Swift语言理解的开发者，这本《Mastering Swift 2》都是一次不可或缺的学习之旅。通过阅读和实践书中的内容，读者不仅能掌握Swift 2语言的核心，还能掌握编写高效、可维护代码的方法，从而在iOS和macOS应用开发领域取得竞争优势。"

Table of Contents

[

]

Chapter 17: Adopting Design Patterns in Swift 345

Value versus reference types 346

What are design patterns 348

Creational patterns 349

The singleton design pattern 349

The builder design pattern 352

The factory method pattern 356

Structural design patterns 358

The bridge pattern 359

The façade pattern 362

The proxy design pattern 364

Behavioral design patterns 367

The command design pattern 367

The strategy pattern 370

Summary 373

Index 375

Preface

[

xii

]

Since Swift is constantly changing and evolving, I've started a blog at

http://masteringswift.blogspot.com/

to keep the readers up to date

with what is new with Swift. The blog will also be used to enhance and

expand on the material in the book.

What this book covers

Chapter 1, Taking the First Steps with Swift, will introduce you to the Swift

programming language and discuss what inspired Apple to create Swift. We'll also

go over the basic syntax of Swift and how to use Playgrounds to experiment and

test Swift code.

Chapter 2, Learning about Variables, Constants, Strings, and Operators, will introduce

you to variables and constants in Swift and when to use them. There will be brief

overviews of the most common variable types with examples on how to use them.

We'll conclude this chapter by showing examples of how to use the most common

operators in the Swift language.

Chapter 3, Using Collections and Cocoa Data Types, will explain Swift's array, set, and

dictionary collection types and show examples on how to use them. We'll also show

how to use Cocoa and Foundation data types with Swift.

Chapter 4, Control Flow and Functions, will show you how to use Swift's control ow

statements. These include looping, conditional, and control transfer statements. The

second half of the chapter is all about functions and how to dene and use them.

Chapter 5, Classes and Structures, is dedicated to Swift's classes and structures. We'll

look at what makes them similar and what makes them different. We'll also look at

access controls and object-oriented design. We'll close this chapter out by looking at

memory management in Swift.

Chapter 6, Using Protocols and Protocol Extensions, will cover both protocols and

protocol extensions in detail since protocols are very important to the Swift

language, and having a solid understanding of them will help us write exible

and reusable code.

Chapter 7, Writing Safer Code with Availability and Error Handling, will cover the new

approach to error handling, which Apple included in Swift 2, in depth as well as

the new availability feature. Error handling is the process of responding to and

recovering from error conditions

Chapter 8, Working with XML and JSON Data, will discuss what XML and JSON data

are and their uses. We'll then see several examples of how to parse and build XML

and JSON data using Apple's frameworks.

Preface

[

xiii

]

Chapter 9, Custom Subscripting, will discuss how we can use custom subscripts in

our classes, structures, and enumerations. Subscripts in Swift can be used to access

elements in a collection. We can also dene custom subscripts for our classes,

structures, and enumerations.

Chapter 10, Using Optional Types, will explain what optional types really are, what are

the various ways to unwrap them, and optional chaining. For a developer who is just

learning Swift, optional types can be one of the more confusing items to learn.

Chapter 11, Working with Generics, will explain how Swift implements generics.

Generics allow us to write very exible and reusable code that avoids duplication.

Chapter 12, Working with Closures, will teach us how to dene and use closures in our

code. Closures in Swift are similar to blocks in Objective-C except that they have a

much cleaner and easier way of using syntax. We will conclude this chapter with a

section on how to avoid strong reference cycles with closures.

Chapter 13, Using Mix and Match, will explain mix and match and demonstrate how

we can include Swift code in our Objective-C projects and Objective-C code in our

Swift projects. With all of the apps and frameworks written in Objective-C, it was

important to allow Swift and Objective-C code to work together.

Chapter 14, Concurrency and Parallelism in Swift, will show how to use both Grand

Central Dispatch and Operation Queues to add concurrency and parallelism to our

applications. Understanding and knowing how to add concurrency and parallelism

to our apps can signicantly enhance the user experience.

Chapter 15, Swift Formatting and Style Guide, will dene a style guide for the Swift

language that can be used as a template for enterprise developers who need to create

a style guide since most enterprises have style guides for the various languages that

they develop in.

Chapter 16, Network Development with Swift, will explain the Apple API's to connect

to remote servers and how best to use them. Network development can be both fun

and challenging.

Chapter 17, Adopting Design Patterns in Swift, will show you how to implement some

of the more common design patterns in Swift. A design pattern identies a common

software development problem and provides a strategy for dealing with it.

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