iOS9应用开发24小时自学指南

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"Sams Teach Yourself iOS9® Application Development in 24 Hours" 是一本2016年2月出版的英文原版iOS应用开发教程书籍，由John Ray撰写，由Sams Publishing发行。本书旨在帮助读者在24小时内逐步学习并掌握iOS9应用程序开发技能。在这本教程中，作者将iOS应用开发的知识点分解为24个独立的学习小时，每个小时都涵盖了一个或多个关键主题，以确保学习过程循序渐进且易于理解。这样的结构使得无论是初学者还是有一定经验的开发者，都能按照自己的节奏进行学习。书中可能包括了以下核心知识点： 1. **Swift编程语言**：iOS应用开发主要使用Swift，这是苹果公司推出的一种强大且易学的编程语言。读者会学习到Swift的基本语法、变量、常量、控制流、函数、类和协议等概念。 2. **Xcode IDE**：Xcode是苹果官方的集成开发环境，用于编写iOS应用。书中可能会介绍如何安装和使用Xcode，创建项目，以及使用Interface Builder设计用户界面。 3. **iOS应用架构**：讲解应用程序的基本结构，如ViewController、Model-View-Controller（MVC）设计模式，以及如何组织和管理应用的各个部分。 4. **用户界面设计**：包括Storyboard的使用，创建各种UI元素（如按钮、文本字段、标签等），以及手势识别和动画效果。 5. **数据持久化**：介绍如何使用Core Data存储应用程序的数据，或者使用SQLite数据库和文件系统。 6. **网络编程**：讲解如何与服务器进行交互，包括使用URLSession进行HTTP请求，以及JSON数据的解析。 7. **多线程与异步处理**：如何在iOS应用中使用GCD（Grand Central Dispatch）和Operation Queues进行并发编程。 8. **推送通知**：如何集成Apple Push Notification服务，实现应用的实时消息推送。 9. **测试与调试**：如何使用Xcode内置的工具进行单元测试和UI测试，以及如何有效地调试代码。 10. **App Store提交指南**：介绍苹果的App Review流程，以及如何准备和提交应用到App Store。这本教程可能还涵盖了其他高级主题，如Core Animation、Core Image、地图服务、游戏开发等，旨在为读者提供全面的iOS开发知识。通过学习这本书，读者有望能够独立开发出功能完善的iOS应用程序。

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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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Welborne

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