iPad开发指南：Objective-C编程实践

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"iPad Programming.pdf 是一本面向iPhone开发者深入学习iPad开发的专业书籍，由Apple iOS开发语言Objective-C编写。本书适合新手和经验丰富的开发者，帮助他们掌握iPad应用开发的关键技术和用户体验设计，以适应快速增长的iPad应用市场。" 本书的核心内容包括： 1. **iPad与iPhone开发的差异**：书中强调了iPad开发与iPhone开发的不同之处，特别是在用户界面和体验设计上的特殊性，让开发者了解如何为iPad优化应用。 2. **新功能介绍**：作者Eric和Daniel详细介绍了3.2 SDK中的新特性，不仅列举了相关的类和方法，更注重解释这些特性的实际应用场景，确保开发者能充分利用这些新功能来提升用户体验。 3. **用户界面设计**：书中深入探讨了如何构建适应iPad大屏幕和多任务处理能力的用户界面，强调了在设计时考虑用户交互和视觉效果的重要性。 4. **应用性能与稳定性**：指导开发者如何创建快速、稳定的应用，同时充分利用iPad的独特功能，如多点触控、Retina显示屏和硬件加速等。 5. **应用移植策略**：对于已有的iPhone应用，书中有专门章节讨论如何将其转换为兼容iPhone和iPad的通用应用，以扩大应用覆盖范围。 6. **实战案例分析**：书中包含多个实际案例，展示了如何将理论知识应用于实践，帮助读者理解并掌握iPad开发的最佳实践。 7. **进阶开发技巧**：除了基础内容，还涵盖了高级主题，比如内存管理、性能优化、多线程编程以及利用iPad的硬件特性，如加速度计和陀螺仪等。 8. **开发者工具和资源**：介绍Xcode IDE、Interface Builder和其他开发工具的使用，以及Apple的开发者资源，如文档、调试工具和测试策略。通过阅读此书，开发者不仅可以掌握iPad应用开发的基础，还能深入了解如何创造出色、创新的iPad应用，以满足这个平台上用户的需求。无论你是新手还是有经验的开发者，这本书都能提供有价值的指导和启示，助你在iPad应用开发领域取得成功。

GETTINGSTARTED 16

1.3 Getting Started

In this book, we assume you know how to develop iPhone apps. Maybe

you’ve written an iPhone app or two for fun or proﬁt. Y o u are certainly

familiar with Cocoa, Objective-C, and the iPhone APIs. Y o u are com-

fortable with the most recent versions of Xcode and Interface Builder.

Y o u know how to work with view controllers and delegates and can use

reference counting to manage memory.

That’s where we’ll start.

W e ’ l l create an iPhone app and quickly review some of the key con-

cepts you’ll need to know in this book. These techniques are common

to iPhone and iPad development. Y o u ’ l l see this at the end of the chap-

ter when we convert this from a project that works only on the iPhone

to one that works on both the iPhone and the iPad.

By the end of this chapter, you’ll know whether you have the right

amount of background for this book. Everything should be familiar,

and the quick review should be enough to bring you up to speed for

the remainder of the book. If you ﬁnd yourself confused or think we’re

moving too fast, then you may need to start with a book on Cocoa or

iPhone development.

If you think we’re moving too slowly and you want to get right to the iPad

material, start with the project in the FromTo/DailyShoot1 directory in the

code download, and skip ahead to Section 1.8, Compatibility Mode.

W e ’ l l build a simple navigation-based application around The Daily

Shoot website (http://dailyshoot.com) created by Mike Clark and James

Duncan Davidson. Their site has suggested a daily assignment for pho-

tographers since November 2009. In this type of app, users navigate

through some number of levels of table views until they select an indi-

vidual item and navigate to its detail view.

4. Y o u can start with Cocoa Programming: A Quick-Start Guide for Developers [Ste09]

and/or iPhone SDK Development [DA09].

Report erratum

this copy is (P1.0 printing, September 2010)

ADDINGA MODELOBJECT 18

Start Xcode, and create a new navigation-based application that does

not use Core Data for storage. Name the project DailyShoot.

By the way, you may have noticed some important differences in the

templates you have available. The Split V i e w - b a s e d Application tem-

plate is new and can be used only for iPad-based projects. The Navi-

gation-based Application and Utility Application templates can be used

only for new iPhone projects. The W i n d o w - b a s e d template can create

an iPhone project, an iPad project, or a universal project that targets

both platforms at once. The remaining templates can be used as the

starting point for either iPhone or iPad projects, but you have to specify

which using a drop-down.

W e ’ r e not going to do anything with the app delegate or with the Main-

Window nib. If this were a production app, we would take the time to

change the name of the RootViewController class and the corresponding

nib to something that has more meaning in the current setting. Because

it’s easy to make an error while making these changes and because the

changes have nothing to do with what we’re working on in this chapter,

we’ll leave the names as they are.

1.4 Adding a Model Object

A table view needs a data source that can answer three basic questions:

• How many sections are in the table?

• For each section, how many rows are in this section?

• For each row, what goes in this row?

In the project created for us from the template, the RootViewController is

the table view’s data source. W e ’ r e going to add a model object to our

project. This is the classic Model V i e w Controller (MVC) decoupling. The

view talks to the controller and the controller talks to the model.

UITableView RootViewController Assignments

tableView:

numberOfRowsInSection:

count:

The table view sends the message tableView:numberOfRowsInSection: to

the controller. The controller in turn sends the message count to the

Assignments object, our model object. The model object responds to the

Report erratum

this copy is (P1.0 printing, September 2010)

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