iOS5应用开发24小时自学指南

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"Teach.Yourself.iOS.5.Application.Development" 本书《Sams Teach Yourself iOS 5 Application Development in 24 Hours》是针对iOS 5应用开发的学习指南，由John Ray撰写，由Sams Publishing出版。这本书旨在帮助开发者快速掌握在iOS 5平台上构建应用程序的技能。在iOS 5开发中，开发者需要了解以下核心知识点： 1. **Objective-C编程语言**：iOS应用主要使用Objective-C编写，它是C语言的超集，包含了Smalltalk风格的消息传递机制。开发者需要熟悉面向对象编程概念，如类、对象、继承、多态和封装。 2. **Xcode集成开发环境（IDE）**：苹果提供的Xcode是开发iOS应用的主要工具，它包括代码编辑器、调试器、模拟器和项目管理工具。熟悉Xcode的界面和功能是成功开发iOS应用的基础。 3. **iOS SDK（软件开发工具包）**：iOS SDK包含了开发iOS应用所需的所有库、框架和工具。开发者需要了解UIKit框架，它是创建用户界面的主要工具，以及Core Data用于数据持久化，Core Location用于获取地理位置信息等。 4. **Interface Builder**：这是一个可视化设计工具，用于创建和布局用户界面。通过拖放控件并连接到代码，可以快速构建应用的外观和交互。 5. **Model-View-Controller (MVC)**：这是一种设计模式，iOS开发中广泛使用。MVC将应用程序分为模型（数据）、视图（显示）和控制器（协调）三部分，有助于保持代码组织有序。 6. **Notification Center**：iOS 5引入了通知中心，开发者可以利用它来实现应用间的通信和用户通知。 7. **GameKit**：对于游戏开发者，GameKit提供了多人游戏支持、成就系统和排行榜等功能。 8. **Auto Layout**：这是iOS 5引入的布局系统，允许开发者定义界面元素之间的约束，以适应不同尺寸的屏幕和设备方向。 9. **Storyboards**：这是一种可视化方式，用于构建应用的导航流程和屏幕间的过渡。通过故事板，开发者可以更直观地设计用户流程。 10. **In-App Purchase**：iOS 5支持应用内购买，开发者可以通过此功能提供付费内容或服务。 11. **iCloud**：苹果的云服务，允许开发者集成同步和备份功能，使得用户的数据可以在多个设备间无缝同步。 12. **多任务处理**：iOS 5对多任务处理进行了改进，开发者可以更好地控制应用在后台运行的能力。通过这24小时的学习计划，开发者将逐步掌握iOS 5应用开发的各个方面，从基础概念到高级特性，逐步成为一名熟练的iOS开发者。同时，书中可能还涵盖了错误处理、性能优化、测试和发布应用的流程等内容，确保开发者能够创建出高质量的iOS 5应用。

Introduction

In less than half a decade, the iOS platform has changed the way that we, the public, think

about our mobile computing devices. Only a few years ago, we were thrilled by phones with

postage-stamp-sized screens, tinny audio, built-in tip calculators, and text-based web brows-

ing. Times have indeed changed. With full-featured applications, an interface architecture

that demonstrates that small screens can be effective workspaces, and touch controls unri-

valed on any platform, the iPhone brings us the convenience of desktop computing within

our pockets.

When Steve Jobs introduced the iPad, people laughed at the name and the idea that “a big

iPod Touch” could be magical. In the 2 years that have passed since its introduction, the

iPad has become the de facto standard for tablet computing and shows no signs of slowing

down. Rarely a week goes by when I don’t read a review of a new app that is described as

“magical” and that could only have been created on the iPad. The excitement and innova-

tion surrounding iOS and the sheer enjoyment of using the iOS devices has led it to become

the mobile platform of choice for users and developers alike.

With Apple, the user experience is key. The iOS is designed to be controlled with your fin-

gers rather than by using a stylus or keypad. The applications are “natural” and fun to use,

instead of looking and behaving like a clumsy port of a desktop app. Everything from inter-

face to application performance and battery life has been considered. The same cannot be

said for the competition.

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

opers. 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 liv-

ing. No matter what the content, with a user base as large as the iPhone, iPod Touch, and

iPad, an audience exists.

Each year, Apple introduces new devices—bringing larger, faster, and higher-resolution

capabilities to the iOS family. With each new hardware refresh come new development

opportunities and new ways to explore the boundaries between software and art.

My hope is that this book will bring iOS development to a new generation of developers.

Teach Yourself iOS 5 Development in 24 Hours provides a clear natural progression of skills

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

mitting an application 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

developer tools, and an Intel Macintosh computer running Lion, you have everything you

need to begin creating software for iOS.

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

writing 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 excit-

ing 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 apps that

are useful and unique, 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 the iPhone and iPad and

have experience using the Macintosh platform. No previous experience with Objective-C,

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 authors do

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 the Apple developer documentation and researching the topics pre-

sented in this book. There is a vast amount of information on iOS development available,

and only limited space in this book. This book covers what you need to forge your own

path forward.

Sams Teach Yourself iOS 5 Application Development in 24 Hours

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