使用iOS 8 SDK和Objective-C开发iPhone和iPad应用

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"Apress Beginning iPhone Development Exploring the iOS SDK 2014" 是一本专为初学者设计的书籍，旨在教授如何使用iOS 8 SDK和Objective-C开发iPhone和iPad应用程序。书中涵盖了一系列主题，从入门到进阶，帮助读者深入理解iOS应用开发。在本书中，作者David Mark、Jack Nutting、Kim Topley、Fredrik Olsson和Jeff LaMarche通过丰富的章节结构，逐步引导读者进入iOS开发的世界。以下是各章主要内容的详细概述： 1. 欢迎来到丛林：这一章是入门介绍，为读者提供了iOS开发环境的概述，包括Xcode IDE的使用和设置，以及如何创建第一个简单的iOS项目。 2. 安抚Tiki神灵：这一章深入介绍了iOS编程的基础，包括Objective-C语言的关键概念，如类、对象、消息传递和内存管理。 3. 处理基本交互：本章探讨了UI元素（如按钮、文本字段和开关）的使用，以及如何响应用户的触摸事件，实现基本的用户交互功能。 4. 更多用户界面乐趣：扩展了上一章的内容，涵盖了更复杂的视图和控件，如滑块、标签和图像视图，以及如何自定义用户界面。 5. 旋转与自适应布局：介绍了如何处理设备的屏幕旋转，以及如何使用Auto Layout实现界面在不同屏幕尺寸上的自适应布局。 6. 多视图应用：讲解如何在应用中添加多个视图，以及如何通过导航控制器和模态视图在它们之间进行切换。 7. 标签栏和选择器：讨论了如何集成标签栏（Tab Bar）和各种选择器（如Picker View），以提供更丰富的用户导航和数据输入方式。 8. 表格视图介绍：深入到UITableView的使用，包括行和列的创建，以及如何处理表格数据源和代理方法。 9. 导航控制器和表格视图：展示了如何使用导航控制器来构建具有层级结构的界面，并结合表格视图实现更复杂的导航和数据展示。 10. CollectionView：介绍了UICollectionView，这是一个用于显示可滚动的多列或网格布局数据的强大工具。 11. 使用分割视图和弹出框：讲解了如何利用UISplitViewController和UIPopoverController在iPad应用中实现多窗格和弹出菜单的交互。 12. 应用设置和UserDefaults：介绍了如何为应用创建自定义设置界面，以及如何使用UserDefaults持久化轻量级用户数据。 13. 基本数据持久化：涵盖了文件系统存储、SQLite数据库和Core Data框架，以实现更复杂的数据保存和检索。 14. 文档和iCloud：探讨了如何集成iCloud，允许用户在不同设备间同步和共享文档，以及如何处理云存储相关的挑战。通过以上章节，读者将能够掌握iOS开发的基本技能，包括UI设计、用户交互、数据管理以及使用苹果的最新技术。书中的实例和练习将帮助读者逐步建立起自己的iOS应用开发能力。

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.

17CHAPTER 2: Appeasing the Tiki Gods

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 Objective-C version of this book, the

appropriate choice here is, of course, Objective-C.

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

projects, and then return to Xcode and navigate into that directory. Before you click the Create

button, take note of the Source Control check box. We won’t be talking about Git in this book, but

Xcode includes some support for using Git and other kinds of source control management (SCM)

tools. If you are already familiar with Git and want to use it, enable this check box; otherwise, feel

free to turn it off.

Note Source Control Management (SCM) is a technique for keeping track of changes made to an

application’s source code and resources while it’s being built. It also facilitates multiple developers working

on the same application at the same time by providing tools to resolve conflicts when they arise. Xcode has

built-in support for Git, one of the most popular SCM systems in use today. We won’t be dealing with source

control issues in this book, so it’s up to you to enable it or disable it, whichever works for you.

After choosing whether to create a Git repository, create the new project by clicking the Create

button.

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使用iOS 8 SDK和Objective-C开发iPhone和iPad应用

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