Swift编程基础：第二版 - iOS与Apple Watch应用开发

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"Swift Essentials 第二版 [电子书]" 本书是Swift编程语言的入门指南，专注于介绍Swift语言和开发iOS应用所需的工具。通过实际操作和示例，读者将了解如何在命令行环境下使用开源版本的Swift，以及如何在OS X上的Xcode Playground编辑器中交互式测试图形内容。书中涵盖了从基础的Swift命令到构建更复杂的网络应用程序。书中各章节内容如下： 1. 探索Swift：本章介绍了开源版Swift和Swift的Read-Evaluate-Print-Loop (REPL)，并通过示例讲解了Swift的基础数据类型、函数和循环语法。 2. 玩转Swift Xcode Playground：展示了如何使用Xcode Playground交互式地尝试Swift代码，并看到图形结果。还介绍了Playground的格式以及如何为Playground添加文档。 3. 创建iOS Swift应用：指导读者如何使用Xcode创建和测试Swift构建的iOS应用，同时概述了Swift中的类、协议和枚举。 4. 使用Swift和iOS的Storyboard应用：通过Storyboard的概念，教授如何创建多屏幕的iOS应用，并演示如何在Interface Builder中连接视图到Swift的outlets和actions。 5. 在Swift中创建自定义视图：涵盖了使用自定义表格视图、嵌套视图布局、自定义图形绘制和层叠动画创建Swift中的自定义视图。 6. 解析网络数据：展示了如何利用Swift与HTTP和基于流的自定义协议进行网络通信。 7. 构建仓库浏览器：运用书中的技术，构建一个可以显示用户GitHub仓库信息的浏览器应用。 8. 添加手表支持：介绍了Apple Watch的功能，并展示如何为iOS应用构建扩展，以便在手表上直接提供数据。附录提供了关于Swift的额外学习资源和参考链接，包括相关网站、博客和知名Twitter用户的列表。这本书是针对Swift 2和Xcode的，适合初学者和有一定经验的开发者，旨在帮助读者从头开始构建iOS和watchOS应用程序。通过详细的步骤和实践项目，读者能够掌握Swift语言的关键概念和工具，从而成为一名熟练的iOS应用开发者。

[ vii ]

Preface

Swift Essentials provides an overview of the Swift language and the tooling necessary

to write iOS applications. From simple Swift commands on the command line using

the open source version of Swift, to interactively testing graphical content on OS X

with the Xcode Playground editor, Swift language and syntax is introduced

by examples.

This book also introduces end-to-end iOS application development on OS X with

Xcode by showing how a simple iOS application can be created, followed by how to

use storyboards and custom views to build a more complex networked application.

The book concludes by providing a worked example from scratch that builds up a

GitHub repository browser for iOS, along with an Apple Watch application.

What this book covers

Chapter 1, Exploring Swift, presents the open source version of Swift with the Swift

Read-Evaluate-Print-Loop (REPL) and introduces the Swift language through

examples of standard data types, functions, and looping.

Chapter 2, Playing with Swift, demonstrates Swift Xcode Playgrounds as a means to

interactively play with Swift code and see graphical results. It also introduces the

playground format and shows how playgrounds can be documented.

Chapter 3, Creating an iOS Swift App, shows how to create and test an iOS application

built in Swift using Xcode, along with an overview of Swift classes, protocols,

and enums.

Chapter 4, Storyboard Applications with Swift and iOS, introduces the concept of

Storyboards as a means of creating a multiscreen iOS application and shows

how views in the Interface Builder can be wired to Swift outlets and actions.

Preface

[ viii ]

Chapter 5, Creating Custom Views in Swift, covers custom views in Swift using custom

table views, laying out nested views, and drawing custom graphics and layered

animations.

Chapter 6, Parsing Networked Data, demonstrates how Swift can talk to networked

services using both HTTP and custom stream-based protocols.

Chapter 7, Building a Repository Browser, uses the techniques described in this book

to build a repository browser that can display information about users' GitHub

repositories.

Chapter 8, Adding Watch Support, introduces the capabilities of the Apple Watch and

shows how to build an extension for the iOS app to provide data directly on the watch.

The Appendix, References to Swift-related Websites, Blogs, and Notable Twitter Users,

provides additional references and resources to continue learning about Swift.

What you need for this book

The exercises in this book were written and tested for Swift 2.1, which is bundled

with Xcode 7.2, and veried against a development build of Swift 2.2. To experiment

with Swift, you will need either a Mac OS X or Linux computer that meets the

requirements shown at https://swift.org/download/.

To run the exercises involving Xcode in Chapters 2–8, you need to have a Mac OS

X computer running 10.9 or above with Xcode 7.2 or above. If newer versions of

Swift are released, check the book's GitHub repository or the book's errata page at

Packtpub for details about any changes that may affect the book's content.

The Swift playground (described in Chapter 2, Playing with Swift) is only

available as part of Xcode on OS X and is not part of the open source

version of Swift.

Also, iOS and watchOS development (Chapters 3-8) is only possible on

OS X with Xcode; it is not possible to create iOS or watchOS applications

on other platforms. Most of the required libraries and modules for iOS

development are not available as part of the open source version of Swift.

Xcode can be installed via the App Store as a free download; search for Xcode in the

search box. Alternatively, Xcode can be downloaded from https://developer.

apple.com/xcode/downloads/

, which is referenced from the iOS Developer Center

at https://developer.apple.com/devcenter/ios/.

Preface

[ ix ]

Once Xcode has been installed, it can be launched from /Applications/Xcode.

app

or from Finder. To run the command line-based exercises, Terminal can be

launched from /Applications/Utilities/Terminal.app, and if Xcode is installed

successfully, swift can be launched by running xcrun swift.

The iOS applications can be developed and tested in the iOS simulator, which comes

bundled with Xcode. It is not necessary to have an iOS device to write or test the

code. If you want to run the code on your own iOS device, then you will need an

Apple ID to sign in, but the application will be limited to directly connected devices.

Similarly, the watch application can be tested in a local simulator or on a local device.

Publishing the application to the AppStore requires that you join the Apple

Developer Program. More information is available at

https://developer.apple.

com/programs/

Who this book is for

This book is aimed at developers who are interested in learning the Swift

programming language, either using the open source version of Swift on Linux

or the version bundled with Xcode on OS X. However, after Chapter 1, Exploring

Swift, the remainder of the chapters use Xcode features or have iOS examples

which can only be used on OS X with Xcode. These chapters show how to write

iOS applications on OS X using Swift. No prior programming experience for iOS

is assumed, though a basic level of programming experience in a dynamically or

statically typed programming language is expected. The reader will be familiar with

navigating and using Mac OS X and, in the cases where Terminal commands are

required, the developer will have experience of simple shell commands or can pick it

up quickly from the examples given.

Developers familiar with Objective-C will know many of the frameworks and

libraries mentioned; however, existing knowledge of Objective-C and its frameworks

is neither necessary nor assumed.

The sources are provided in a GitHub repository at

https://github.com/alblue/

com.packtpub.swift.essentials/

, and they can be used to switch between the

content of chapters using the tags in the repository. Knowledge of Git is helpful if

you are wanting to navigate between different versions; alternatively, the web-based

interface at GitHub may be used instead. It is highly recommended that the reader

becomes familiar with Git as it is the standard version control system for Xcode

and the de facto standard for open source projects. The reader is invited to read the

Git topics at the author's blog http://alblue.bandlem.com/Tag/git/ if they are

unfamiliar and interested in learning more.

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