Swift入門：David Mark 指导iOS 8 SDK开发实战

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"《使用Swift开启iPhone开发之旅：探索iOS SDK》是由David Mark、Jack Nutting、Kim Topley、Fredrik Olsson和Jeff LaMarche合著的一本权威指南。本书专为那些想要学习如何利用iOS 8 SDK和Swift语言构建iPhone和iPad应用程序的开发者设计，深入浅出地介绍了Swift在iOS开发中的应用和iOS SDK的核心概念。本书分为14章，从入门级的欢迎篇" WelcometotheSwiftJungle" 开始，逐步引导读者理解Swift编程语言的基础，并逐步提升技能。第二章"AppeasingtheTikiGods" 可能探讨的是适应性UI设计，确保应用程序在不同设备和屏幕尺寸上表现良好。"HandlingBasicInteraction" 部分着重于用户界面元素的基本交互设计和处理。第三章至第十四章分别涉及了多样的主题，如更丰富的用户界面设计（Chapter 4），布局管理和旋转支持（Chapter 5），多视图应用程序的设计（Chapter 6），tab bar和pickers的使用（Chapter 7），以及表格视图和导航控制器的结合（Chapter 9）。Chapter 10介绍collectionView，这是数据展示的强大工具。接下来，读者将学习如何运用split views和popovers（Chapter 11）来提供灵活的用户体验。 Chapter 12介绍了应用设置和UserDefaults，这对于管理应用的配置和用户偏好至关重要。"BasicDataPersistence" 章节则涵盖了基础的数据存储技术，确保数据在应用生命周期中的持久性。最后，"DocumentsandiCloud" 章节探讨了如何利用文档目录和云服务来扩展应用程序的功能。《 Beginning iPhone Development with Swift: Exploring the iOS SDK》是一本详尽实用的教程，不仅适合初学者掌握Swift和iOS开发，也为有经验的开发者提供了最新的技术和实践案例，帮助他们与时俱进地进行iOS应用开发。书中涵盖了iOS开发的核心组件和技术，为读者构建高效、现代的移动应用提供了坚实的基础。"

Chapter 2

Appeasing the Tiki Gods

As you’re probably well aware, it has become something of a tradition to call the first project in any

book on programming, “Hello, World.” We considered breaking with this tradition, but were scared

that the Tiki gods would inflict some painful retribution on us for such a gross breach of etiquette.

So, let’s do it by the book, shall we?

In this chapter, we’re going to use Xcode to create a small iOS application that will display the text,

“Hello, World!” We’ll look at what’s involved in creating an iOS application project in Xcode, work

through the specifics of using Xcode’s Interface Builder to design our application’s user interface,

and then run our application on the iOS simulator. After that, we’ll give our application an icon to

make it feel more like a real iOS application.

We have a lot to do here, so let’s get going.

Setting Up Your Project in Xcode

By now, you should have Xcode and the iOS SDK installed on your machine. You should also

download the book’s source code archive from the Apress web site (http://apress.com). While

you’re at it, take a look at the book forums at http://forum.learncocoa.org/. The book forums

are a great place to discuss iOS development, get your questions answered, and meet up with

like-minded people.

Note Even though you have the complete set of project files at your disposal in this book’s source code

archive, you’ll get more out of the book if you create each project by hand, rather than simply running

the version you downloaded. By doing that, you’ll gain familiarity and expertise working with the various

application development tools.

There’s no substitute for actually creating applications; software development is not a spectator sport.

16 CHAPTER 2: Appeasing the Tiki Gods

Click the Single View Application icon (see 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 these to generate a

unique bundle identifier for your app. You’ll also see a field that lets you enter an Organization

Name, which Xcode will use to automatically insert a copyright notice into every source code file you

create. Name your product Hello World, call your organization Apress, 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.

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

The Language field lets you select the programming language that you want to use. You can choose

between Objective-C and Swift. Since you’re reading the Swift version of this book, the appropriate

choice here is, of course, Swift.

We also need to specify the Devices. 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 Devices 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

roughly the same screen size and form factor. For the first few chapters of the book, we’ll be using

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

Leave the Core Data check box unchecked—we’ll make use of it in Chapter 13. Click Next again,

and you’ll be asked where to save your new project using a standard save sheet (see Figure 2-4). If

you haven’t already done so, jump over to the Finder, create a new master directory for these book

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