Swift 2.0带你掌握面向对象编程：实战构建高效应用

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Preface

Object-oriented programming, also known as OOP, is a required skill in any modern

software developer job. It makes a lot of sense because object-oriented programming

allows you to maximize code reuse and minimize maintenance costs. However,

learning object-oriented programming is challenging because it includes too

many abstract concepts that require real-life examples to be easy to understand. In

addition, object-oriented code that doesn't follow best practices can easily become a

maintenance nightmare.

Swift is a multi-paradigm programming language, and one of its most important

paradigms is OOP. If you want to create great applications and apps for Mac, iPhone,

iPad, Apple TV, and Apple Watch, you need to master OOP in Swift. In addition, as

Swift also grabs the nice features found in functional programming languages, it is

convenient to know how to mix OOP code with functional programming code.

This book will allow you to develop high-quality reusable object-oriented code in

Swift 2.2. You will learn the object-oriented programming principles and how Swift

implements them. You will learn how to capture objects from real-world elements

and create object-oriented code that represents them. You will understand Swift's

approach towards object-oriented code. You will maximize code reuse and reduce

maintenance costs. Your code will be easy to understand, and it will work with

representations of real-life elements.

What this book covers

Chapter 1, Objects from the Real World to Playground, teaches you the principles of

object-oriented paradigms. We will discuss how real-world objects can become part

of the fundamental elements of code. We will translate elements into the different

components of the object-oriented paradigm supported in Swift: classes, protocols,

properties, methods, and instances.

Preface

[ vi ]

Chapter 2, Structures, Classes, and Instances, starts generating blueprints to create

objects. You will learn about an object's life cycle, and we will work with many

examples to understand how object initializers and deinitializers work.

Chapter 3, Encapsulation of Data with Properties, introduces you to organizing data in

the blueprints that generate objects. We will understand the different members of a

class and how they are reected by members of the instances generated from a class.

You will learn the difference between mutable and immutable classes.

Chapter 4, Inheritance, Abstraction, and Specialization, introduces you to creating a

hierarchy of blueprints that generate objects. We will take advantage of inheritance

and many related features to specialize behavior.

Chapter 5, Contract Programming with Protocols, discusses how Swift works with

protocols in combination with classes. We will declare and combine multiple

blueprints to generate a single instance. We will declare protocols with different types

of requirements, and then we will create classes that conform to these protocols.

Chapter 6, Maximization of Code Reuse with Generic Code, teaches you how to maximize

code reuse by writing code capable of working with objects of different types—that

is, instances of classes that conform to specic protocols or whose class hierarchy

includes specic superclasses. We will work with protocols and generics.

Chapter 7, Object-Oriented Programming and Functional Programming, teaches you

how to refactor existing code to take full advantage of object-oriented code. We will

prepare the code for future requirements, reduce maintenance costs, and maximize

code reuse. We will also work with many functional programming features included

in Swift combined with object-oriented programming.

Chapter 8, Extending and Building Object-Oriented Code, puts together all the pieces of

the object-oriented puzzle. We will take advantage of extensions to add features to

types, classes, and protocols in which we don't have access to the source code. We

will make sure that the code exposes only the things that it has to expose, and you

will learn how everything you learned about object-oriented programming is useful

in any kind of app we might create.

What you need for this book

In order to work with Xcode and the Swift Playground, you will need a Mac OS

computer capable of running OS X 10.10.5 or later with 8 GB of RAM.

Preface

[ ix ]

Errata

Although we have taken every care to ensure the accuracy of our content, mistakes

do happen. If you nd a mistake in one of our books—maybe a mistake in the text or

the code—we would be grateful if you could report this to us. By doing so, you can

save other readers from frustration and help us improve subsequent versions of this

book. If you nd any errata, please report them by visiting http://www.packtpub.

com/submit-errata, selecting your book, clicking on the Errata Submission Form

link, and entering the details of your errata. Once your errata are veried, your

submission will be accepted and the errata will be uploaded to our website or added

to any list of existing errata under the Errata section of that title.

To view the previously submitted errata, go to https://www.packtpub.com/books/

content/support and enter the name of the book in the search eld. The required

information will appear under the Errata section.

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Please contact us at copyright@packtpub.com with a link to the suspected pirated

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We appreciate your help in protecting our authors and our ability to bring you

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eBooks, discount offers, and more

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and ePub les available? You can upgrade to the eBook version at www.PacktPub.

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Questions

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questions@packtpub.com, and we will do our best to address the problem.

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