探索iOS 6开发：SDK深度解析

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" Beginning iOS 6 Development Exploring the iOS SDK.pdf" 本书是一本深入探索iOS 6 SDK的专业指南，旨在帮助读者提升对iOS开发的理解和技能。作者通过详细讲解各个章节，覆盖了从基础到高级的各种主题，使得无论是初学者还是有经验的开发者都能从中受益。在"About the Authors"和"About the Technical Reviewers"部分，读者可以了解到作者的专业背景和审阅者的资质，这为书籍的权威性提供了保证。书中从第一章"Welcome to the Jungle"开始，引导读者进入iOS开发的世界，介绍基本概念和环境设置。第二章"Apeasing the Tiki Gods"可能涉及的是iOS开发的基本规则和编程规范，帮助开发者理解苹果的开发哲学。第三章"Handling Basic Interaction"则深入到用户界面交互的实现，包括按钮、文本输入等常见元素的处理。第四章"More User Interface Fun"进一步扩展了用户界面设计，涵盖了更复杂的界面组件和布局。第五章"Autorotation and Autosizing"讨论了屏幕旋转和视图自适应，确保应用在不同设备和方向上的表现。第六章"Multiview Applications"讲解了如何在应用中管理多个视图，第七章"TabBars and Pickers"则关注tab栏和选择器的使用，提供更丰富的用户交互体验。第八章"Introduction to TableViews"介绍了表格视图的基础，这是iOS应用中常用的数据展示方式。第九章"NavigationControllers and TableViews"探讨了导航控制器与表格视图的结合，用于构建层级结构的界面。第十章"Storyboards"讲述了故事板技术，这是一种可视化的方式，用于设计应用的流程和界面转换。第十一章"iPad Considerations"专门讨论了针对iPad平台的特定优化和设计问题。第十二章"Application Settings and UserDefaults"介绍了存储用户偏好设置和应用数据的方法。第十三章"Basic Data Persistence"讲解了数据持久化，如使用SQLite或NSUserDefaults来保存应用状态。第十四章"Hey! You! Get onto iCloud!"涵盖了如何集成iCloud，利用云服务实现数据同步和备份。第十五章"GrandCentralDispatch, Background Processing, and You"介绍了Grand Central Dispatch（GCD）和后台处理，帮助开发者理解多线程和异步编程。第十六章"Drawing with Quartz and OpenGL"涉及到图形绘制，包括使用Quartz 2D和OpenGL进行高性能图形渲染。第十七章"Taps, Touches, and Gestures"讨论了触摸事件处理和手势识别，让应用具备更丰富的触控交互。最后，第十八章可能涉及更多高级话题或者总结和展望，为读者提供了进一步学习和实践的方向。通过这本书的系统学习，读者将能够掌握iOS 6 SDK的主要特性和开发技巧，从而能自信地创建出高质量的iOS应用程序。

12 CHAPTER 2: Appeasing the Tiki Gods

Figure 2-1. The Xcode welcome window

The project we’re going to build in this chapter is contained in the 02 Hello World folder of the

project archive.

Before we can start, we need to launch Xcode. Xcode is the tool that we’ll use to do most of what

we do in this book, and after downloading it from the Mac App Store you’ll find it installed in the

/Applications folder as with most Mac applications. You’ll be using Xcode a lot, so you might want to

consider dragging it to your dock so you’ll have ready access to it.

If this is your first time using Xcode, don’t worry; we’ll walk you through every step involved in

creating a new project. If you’re already an old hand but haven’t worked with Xcode 4, you will find

that quite a bit has changed (mostly for the better, we think).

When you first launch Xcode, you’ll be presented with a welcome window like the one shown in

Figure 2-1. From here, you can choose to create a new project, connect to a version-control system

to check out an existing project, or select from a list of recently opened projects. The welcome

window also contains links to iOS and Mac OS X technical documentation, tutorial videos, news,

sample code, and other useful items. All of this functionality can be accessed from the Xcode menu

as well, but this window gives you a nice starting point, covering some of the most common tasks

you’re likely to want to do after launching Xcode. If you feel like poking through the information here

for a few minutes, by all means go right ahead. When you’re finished, close the window, and we’ll

proceed. If you would rather not see this window in the future, just uncheck the Show this window

when Xcode launches checkbox before closing it.

15CHAPTER 2: Appeasing the Tiki Gods

We also need to specify the Device Family. In other words, Xcode wants to know if we’re building

an app for the iPhone and iPod touch, if we’re building an app for the iPad, or if we’re building a

universal application that will run on all iOS devices. Select iPhone for the Device Family if it’s not

already selected. This tells Xcode that we’ll be targeting this particular app at the iPhone and iPod

touch, which have the same screen size. For the first part of the book, we’ll be using the iPhone

device family, but don’t worry—we’ll cover the iPad also.

There are three checkboxes on this sheet. You should check the middle option, Use Automatic

Reference Counting, but uncheck the other two. Automatic Reference Counting (ARC) is a recent

addition to the Objective-C language, introduced with iOS 5, that makes your life much easier. We’ll

talk briefly about ARC in the next chapter.

The Use Storyboard option will be covered starting in Chapter 10. The other option—Include Unit

Tests—will set up your project in such a way that you can add special pieces of code to your

project, called unit tests, which are not part of your application but run every time you create your

application to test certain functionality. Unit tests allow you to identify when a change made to your

code breaks something that was previously working. Although it can be a valuable tool, we won’t be

using automated unit testing in this book, so you can leave its box unchecked.

Click Next again, and you’ll be asked where to save your new project using a standard save sheet,

as shown in Figure 2-4. If you haven’t already done so, jump over to the Finder and create a new

master directory for these book projects, and then return to Xcode and navigate into that directory.

Before you click the Create button, make note of the the Create local git repository for this project

checkbox. We won’t be talking about git in this book, but Xcode includes some support for using git

and other kinds of source control repositories. If you are already familiar with git and want to use it,

leave this checkbox enabled, but otherwise feel free to turn it off.

Figure 2-4. Saving your project in a project folder on your hard drive

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