iOS开发入门：从新手到精通

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"IOS5开发基础教程" 这是一本面向初学者的iOS开发英文经典教程，主要针对使用iOS 5版本进行应用开发。本书适合那些对苹果移动开发感兴趣且具有一定英语阅读能力的开发者。通过详细讲解和简单的示例，帮助读者逐步掌握iOS应用开发的基本技能。书中内容涵盖广泛，包括以下几个核心知识点： 1. **Chapter 1: WelcometotheJungle** - 开篇介绍，为读者提供iOS开发环境的搭建，Xcode的使用以及iOS开发的基本概念，让新手快速进入开发环境。 2. **Chapter 2: AppeasingtheTikiGods** - 讲解Objective-C语言基础，这是iOS开发的主要编程语言，包括语法、类、对象等基础知识。 3. **Chapter 3: HandlingBasicInteraction** - 教程进入用户界面交互部分，如按钮、开关等基本控件的使用，以及如何响应用户操作。 4. **Chapter 4: MoreUserInterfaceFun** - 进一步探讨更复杂的用户界面元素，如图像、标签、滑块等，提升用户体验的设计。 5. **Chapter 5: AutorotationandAutosizing** - 介绍屏幕旋转和自动布局机制，确保应用在不同设备和方向下都能正确显示。 6. **Chapter 6: MultiviewApplications** - 讨论多视图应用的构建，包括导航和页面切换，使应用具有深度和层次感。 7. **Chapter 7: TabBarsandPickers** - 学习如何使用标签栏和选择器，提供用户友好的数据输入和浏览方式。 8. **Chapter 8: IntroductiontoTableViews** - 深入讲解表格视图的使用，这是iOS开发中常见且重要的组件，用于展示列表数据。 9. **Chapter 9: NavigationControllersandTableViews** - 结合导航控制器与表格视图，创建更复杂的导航结构和数据驱动的界面。 10. **Chapter 10: Storyboards** - 引入故事板概念，它是Xcode中的可视化工具，用于设计和组织应用的界面流程。 11. **Chapter 11: iPadConsiderations** - 针对iPad的特性和优化，讨论如何为大屏设备设计和适配应用。 12. **Chapter 12: ApplicationSettingsandUserDefaults** - 讲解应用设置和用户默认值的管理，保存用户偏好和应用状态。 13. **Chapter 13: BasicDataPersistence** - 学习数据持久化技术，如文件存储、SQLite数据库，用于保存应用数据。 14. **Chapter 14: Hey!You!GetontoiCloud!** - 探讨如何利用iCloud实现数据同步，让应用的数据在多个设备间无缝流动。 15. **Chapter 15: GrandCentralDispatch,BackgroundProcessing,andYou** - 介绍Grand Central Dispatch（GCD）和后台处理，提高应用性能和用户体验。 16. **Chapter 16: DrawingwithQuartzandOpenGL** - 教授使用Quartz 2D和OpenGL进行图形绘制，创建自定义的视觉效果。 17. **Chapter 17: Taps,Touches,andGestures** - 深入触摸事件处理，包括点击、滑动等手势识别，增强应用的交互性。 18. **Chapter 18: WhereAm** - 该章节可能涉及地理位置服务，讲解如何集成地图和定位功能，提供基于位置的服务。通过这些章节的学习，读者可以掌握iOS应用开发的基本技能，并具备开发完整功能应用的能力。此外，书中还包括作者简介、技术审阅者信息、致谢等内容，提供了一个全面的学习框架。无论是对iOS开发感兴趣的初学者，还是寻求巩固基础的开发者，都能从这本书中获益匪浅。

CHAPTER 2: Appeasing the Tiki Gods

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, but it’s not installed in the /Applications folder as with

most Mac applications. If you’ve already installed the developer tools as outlined in the

previous chapter, you’ll find Xcode located in /Developer/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. Apple recently released a new, completely rewritten

version of Xcode that’s quite a bit different than the previous version. If you’re already an

old hand but haven’t worked with Xcode 4, you will find that quite a bit has changed.

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.

Figure 2–1. The Xcode welcome window

CHAPTER 2: Appeasing the Tiki Gods

Click the Single View Application icon (as in Figure 2–2), and then click the Next button.

You’ll see the project options sheet, which should look like Figure 2–3. On this sheet,

you need to specify the Product Name and Company Identifier for your project. Xcode

will combine the two of those to generate a unique Bundle Identifier for your app. Name

your product Hello World, and then enter com.apress in the Company Identifier field, as

shown in Figure 2–3. Later, after you’ve signed up for the developer program and

learned about provisioning profiles, you’ll want to use your own company identifier. We’ll

talk more about the bundle identifier later in the chapter.

Figure 2–3. Selecting a product name and company identifier for your project. Use these settings for now.

The next text box is labeled Class Prefix, and we should populate this with a sequence

of at least three capital letters. These characters will be added to the beginning of the

name of all classes that Xcode creates for us. This is done to avoid naming conflicts with

Apple (who reserves the use of all two-letter prefixes) and other developers whose code

we might use. In Objective-C, having more than one class with the same name will

prevent your application from being built.

For the projects in the book, we’re going to use the prefix BID, which stands for

Beginning iPhone Development. While there are likely to be many classes named, for

example, ViewController, far fewer classes are likely to be named BIDMyViewController,

which means a lot less chance of conflicts.

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

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