24小时掌握iOS 9应用开发：从入门到实战

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《24小时精通iOS 9应用开发》(SAMS,2016)是一本针对iOS新手和进阶开发者设计的实用教程。该书在短短24个1小时课程中，全面指导读者如何为iPhone和iPad构建功能强大的应用程序，内容涵盖了iOS 9开发环境的搭建、Swift 2.0语言的学习、以及一系列关键技术和实践技巧。作者采用循序渐进的方式，确保每个步骤都在前一课的基础上扩展，帮助读者建立坚实的实际项目基础。书中包括： 1. **入门指南**：介绍如何在Xcode 7.x环境中导航并安装应用到实际设备，让初学者快速熟悉开发工具。 2. **编程语言**：学习Apple开源语言Swift 2.0，了解其特性和语法，以及如何在iOS Playground中测试代码和逻辑。 3. **架构模式**：讲解Model-View-Controller（MVC）开发模式，这是iOS应用架构的基础。 4. **用户界面设计**：通过Xcode Storyboards、Segues、Exits、Image Slicing和iOS Object Library，进行界面布局与编程。 5. **响应式设计**：利用Auto Layout和Size Classes适应不同屏幕尺寸和方向，创建高级UI元素如Table视图、Split View等。 6. **数据管理**：学习如何处理偏好设置、读写数据，以及创建系统设置插件。 7. **媒体处理**：掌握媒体播放、录音功能，以及Core Image库在图像处理中的应用。 8. **传感器技术**：运用加速度计、陀螺仪和GPS定位功能感知设备运动、方向和位置。 9. **3D触控功能**：了解如何集成Peek、Pop和Quick Actions，提升用户体验。 10. **集成在线服务**：通过Twitter、Facebook、邮件、Web视图和Apple Maps等接口，实现应用与外部服务的交互。 11. **跨平台应用**：编写可以同时运行于iPhone和iPad的通用应用。 12. **多任务处理**：编写支持后台运行和多任务的应用，提高性能和用户体验。 13. **调试与监控**：学会使用调试工具追踪、分析和优化程序性能。 14. **版权信息**：版权声明强调复制权限要求，并提醒读者关于版权法律的责任限制。此外，书中还提供了额外的在线文件和更新资源，确保读者始终获得最新的开发知识和技术支持。《24小时精通iOS 9应用开发》是一本实战导向的教程，适合想要快速上手iOS开发或进一步提升技能的读者使用。

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Introduction

When you pick up an iOS device and use it, you feel connected. Whether it be an iPad, an

iPhone, or an iPod, the interface acts as an extension to your fingers; it is smooth, comfortable,

and invites exploration. Other competing devices offer similar features, and even sport gadgets

such as wraparound screens and trackpads, but they cannot match the user experience that

is iOS.

iOS and its associated development tools have changed rapidly over the past few years. iOS 7

brought us a new user interface that used depth and translucency to keep users connected to

their content and aware of the context in which they are accessing it. iOS 8 surprised everyone

with a brand new language for developing apps: Swift. Alongside the introduction of iOS 9,

Swift became an open source language, solidifying it as the future of development on Apple

platforms and beyond.

Swift marks a dramatic change in the history of iOS and OS X development. With Swift, Apple

has effectively retired the Objective-C language—used on Apple and NeXT platforms for over 25

years. Swift offers a friendlier development platform with more modern language features and

tools. While in development for more than 4 years at Apple, by the time this book reaches you,

Swift will have existed as a public programming language for a little over a year.

Unfortunately, there are some caveats to writing about a young language. Swift is rapidly evolv-

ing, and changes with each release of Apple’s development environment: Xcode. Code that is

written in one version of Xcode sometimes breaks in the next. In the version of Swift shipping

with iOS 9, for example, the language took syntax used for creating loops and changed its pur-

pose entirely. Suddenly, code that was only a few months old stopped working.

Swift presents challenges, but I also think you’ll find that programming in Swift is fun (yes,

really) and intuitive.

When creating Swift and the iOS development platform, Apple considered the entire application

lifecycle. From the interface design tools, to the code that makes it function, to the presentation

to the user, everything is integrated and works together seamlessly. As a developer, does this

mean that there are rules to follow? Absolutely. But, by following these rules, you can create

applications that are interactive works of art for your users to love—not software they will load

and forget.

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Introduction

Through the App Store, Apple has created the ultimate digital distribution system for iOS appli-

cations. Programmers of any age or affiliation can submit their applications to the App Store

for just the cost of a modest yearly Developer Membership fee. Games, utilities, and full-feature

applications have been built for everything from pre-K education to retirement living. No mat-

ter what the content, with a user base as large as the iPhone, iPod touch, and iPad, an audience

exists.

My hope is that this book brings iOS development to a new generation of developers. Sams Teach

Yourself iOS 9 Application Development in 24 Hours provides a clear and natural progression of

skills development, from installing developer tools and registering your device with Apple, to

debugging an application before submitting it to the App Store. It’s everything you need to get

started, in 24 one-hour lessons.

Who Can Become an iOS Developer?

If you have an interest in learning, time to invest in exploring and practicing with Apple’s devel-

oper tools, and an Intel Macintosh computer running Yosemite, El Capitan, or later, you have

everything you need to begin creating software for iOS. Starting with Xcode 7, Apple even lets

you run your applications on your own devices (no developer membership required)!

Developing an app won’t happen overnight, but with dedication and practice, you can be writ-

ing your first applications in a matter of days. The more time you spend working with the Apple

developer tools, the more opportunities you’ll discover for creating new and exciting projects.

You should approach iOS application development as creating software that you want to use,

not what you think others want. If you’re solely interested in getting rich quick, you’re likely to

be disappointed. (The App Store is a crowded marketplace—albeit one with a lot of room—and

competition for top sales is fierce.) However, if you focus on building useful and unique apps,

you’re much more likely to find an appreciative audience.

Who Should Use This Book?

This book targets individuals who are new to development for iOS and have experience using

the Macintosh platform. No previous experience with Swift, Cocoa, or the Apple developer tools

is required. Of course, if you do have development experience, some of the tools and techniques

may be easier to master, but the author does not assume that you’ve coded before.

That said, some things are expected of you, the reader. Specifically, you must be willing to invest

in the learning process. If you just read each hour’s lesson without working through the tutorials,

you will likely miss some fundamental concepts. In addition, you need to spend time reading

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What Is (and Isn’t) in This Book?

the Apple developer documentation and researching the topics presented in this book. A vast

amount of information on iOS development is available, but only limited space is available in

this book. Therefore, this book covers what you need to forge your own path forward.

What Is (and Isn’t) in This Book?

The material in this book specifically targets iOS release 9.1 and later on Xcode 7.1 and later.

Much of what you’ll learn is common to all the iOS releases, but this book also covers several

important areas that have only come about in recent iOS releases, such as gesture recognizers,

embedded video playback with 3D Touch, AirPlay, Core Image, social networking, multitasking,

universal (iPhone/iPad) applications, auto layout, size classes, and more!

Unfortunately, this is not a complete reference for the iOS application programming interfaces

(APIs), nor do I explicitly cover AppleTV or Apple Watch development; some topics just require

much more space than this book allows. That said, this book should provide ample exposure

to the tools and techniques that any iOS developer needs to be successful. In addition, the

Apple developer documentation is available directly within the free tools you install in Hour

1 , “Preparing Your System and iDevice for Development.” In many hours, you’ll find a section

titled “Further Exploration.” This identifies additional related topics of interest. Again, a willing-

ness to explore is an important quality in becoming a successful developer.

Each coding lesson is accompanied by project files that include everything you need to compile

and test an example or, preferably, follow along and build the application yourself. Be sure to

download the project files from this book’s website at http://teachyourselfios.com . If you have

issues with any projects, view the posts on this site to see whether a solution has been identified.

In addition to the support website, you can follow along on Twitter! Search for #iOSIn24 on

Twitter to receive official updates and tweets from other readers. Use the hashtag #iOSIn24 in

your tweets to join the conversation. To send me messages via Twitter, begin each tweet with

@johnemeryray.

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