精通iOS 4应用程序开发

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"Advanced.iOS.4.Programming 是一本由 Maher Ali 博士编著的书籍，专注于苹果iOS 4版本的移动应用开发，涵盖了iPhone、iPad和iPod touch的编程技术。该书由 John Wiley and Sons Ltd. 出版，首次出版于2010年。" 在这本《Advanced iOS 4 Programming》中，读者将深入学习如何开发适用于苹果移动设备的应用程序。iOS 4是苹果公司的一个重要操作系统版本，它引入了许多新功能和改进，如多任务处理、Game Center、本地推送通知以及对iAd广告平台的支持。这本书对于那些希望利用这些新特性和功能创建现代应用程序的开发者来说是一份宝贵的资源。书中可能详细讲解了以下关键知识点： 1. **Objective-C编程基础**：作为iOS开发的主要语言，Objective-C的基础语法、类、协议、继承等概念会被详细解释。 2. **Xcode IDE**：介绍如何使用Xcode进行项目设置、界面设计、调试和测试，包括Interface Builder的使用。 3. **Cocoa Touch框架**：深入解析用于构建用户界面的Cocoa Touch框架，包括UIControl、UITableView、UIViewController等核心组件。 4. **多任务处理**：iOS 4引入了多任务支持，开发者将学习如何在后台运行服务，如音乐播放和位置更新。 5. **内存管理**：在iOS平台上，有效的内存管理至关重要。书里会详细讲解如何使用引用计数和ARC（Automatic Reference Counting）来避免内存泄漏。 6. **网络编程**：介绍如何集成HTTP、HTTPS、XML、JSON等网络服务，实现数据的获取和发送。 7. **Core Data**：深入理解苹果的数据持久化框架Core Data，包括模型设计、实体关系、NSManagedObjects等。 8. **Game Center**：如何集成Game Center，实现游戏排名、成就系统和多人在线游戏。 9. **推送通知**：介绍如何设置和处理本地及远程推送通知，增强用户体验。 10. **iAd集成**：学习如何在应用中添加iAd广告，同时了解广告展示的最佳实践。 11. **性能优化**：讨论如何通过代码优化、图形渲染和数据结构设计来提高应用的性能。 12. **测试与发布**：涵盖应用的测试策略，包括单元测试和UI自动化测试，以及App Store的提交流程和应用审核指南。这本书不仅适合初学者入门，也适合有一定经验的iOS开发者提升技能。通过阅读和实践，开发者可以掌握创建高质量、高性能的iOS 4应用程序所需的全部技术。书中实例丰富，理论与实践相结合，旨在帮助读者全面理解iOS开发的各个方面，从而能构建出符合苹果平台标准的先进应用。

Preface

Welcome to Advanced iOS 4 Programming, a text that targets the development of mobile applications

on devices (such as the iPhone, iPad, and iPod touch) running the iOS 4 operating system.

This text covers a wide variety of essential and advanced topics, including

• The Objective-C programming language and runtime

• Collections

• Cocoa Touch

• Interface Builder

• Building advanced mobile user interfaces

• Core Animation and Quartz 2D

• Model-view-controller (MVC) designs

•Table views

•Core Data

• Developing for the iPad

• Grand Central Dispatch

• File management

• Parsing XML documents using SAX, DOM, and TouchXML

• Working with the Map Kit API

• Remote and local push notiﬁcation

• Multitasking

• Working with the address book

• Consuming RESTful web services

• Blocks (closures) in Objective-C

• Building advanced location-based applications

• Developing database applications using the SQLite engine

• Cut, copy, and paste

xvi Preface

Italic type is used for

• New terms and concepts when they are introduced

• Specifying emphasis in text

Organization

Chapter 1 This chapter serves as a quick introduction to the tools bundled with the SDK. It also

shows you the basic development phases, including coding, UI design, and debugging.

Chapter 2 This chapter presents the main features of the Objective-C language under the Cocoa

environment. We introduce the main concepts behind classes in Objective-C. You will learn

how to declare a new class, deﬁne it, and use it from within other classes. You will also be

exposed to important Cocoa classes and data types. You will learn about memory management

in iOS4. You will learn how to create new objects as well as how to deallocate them. You will

also learn about your responsibility when obtaining objects from Cocoa frameworks or other

frameworks. We also introduce the topic of Objective-C protocols. You will learn how to adopt

protocols and how to declare new ones as well. This chapter also covers language features

such as properties, categories, and posing. Exceptions and error handling techniques are both

covered in this chapter, and you will be exposed to the concept of key-value coding (KVC).

You will also learn about blocks, how to utilize multithreading (including Grand Central

Dispatch), and use notiﬁcations, and will be exposed to the Objective-C runtime system.

Chapter 3 This chapter addresses the topic of collections in Cocoa. It discusses arrays, sets, and

dictionaries. You will learn about immutable and mutable collections, the different approaches

used for copying collections, and several sorting techniques.

Chapter 4 In this chapter, we discuss the basic steps needed to build a simple iPhone application.

First, we demonstrate the basic structure of a simple iPhone application and then we show the

steps needed to develop the application using XCode.

Chapter 5 This chapter explains the main concepts behind views. You will learn about view

geometry, view hierarchy, the multitouch interface, animation, and basic Quartz 2D drawing.

Chapter 6 In this chapter, you will learn about the base class for all controls,

UIControl,and

the important target-action mechanism. This chapter also presents several important graphical

controls that can be used in building attractive iPhone applications.

Chapter 7 In this chapter, you will learn about the available view controllers that are provided

to you in the iPhone SDK. Although you can build iPhone applications without the use of

these view controllers, you shouldn’t. As you will see in this chapter, view controllers greatly

simplify your applications. This chapter provides a gentle introduction to view controllers.

After that, detailed treatment of tab-bar controllers, navigation controllers, and modal view

controllers is provided.

Preface xvii

Chapter 8 In this chapter, we present several important subclasses of the UIView class. We discuss

picker views and show how they can be used for item selection. We investigate progress views

and also talk about activity indicator views. After that, we show how to use scroll views in

order to display large views. Next, we present text views used in displaying multiline text.

After that, we show how to use alert views for the display of alert messages to the user. Similar

to alert views are action sheets, which are also discussed. We also deal with several aspects of

web views.

Chapter 9 This chapter will take you on a step-by-step journey through the world of table views. We

start by presenting an overview of the main concepts behind table views. After that, we present

a simple table view application and discuss the mandatory methods you need to implement

in order to populate and respond to users’ interactions with the table view. We show how

easy it is to add images to table rows. We introduce the concept of sections and provide a

table view application that has sections, with section headers and footers. We introduce the

concept of editing a table view. An application that allows the user to delete rows is presented

and the main ideas are clariﬁed. We address the insertion of new rows in a table view. An

application is discussed that presents a data entry view to the user and adds that new data

to the table’s rows. We continue our discussion of editing mode and present an application

for reordering table entries. The main concepts of reordering rows are presented. We discuss

the mechanism for presenting hierarchical information to the user. An application that uses

table views to present three levels of hierarchy is discussed. We deal with grouped table views

through an example. After that, we present the main concepts behind indexed table views.

Next, we present a dynamic table view controller class that can be used to show cells with

varying heights. Finally, we address the issue of turning the text color to white when a custom

cell is selected.

Chapter 10 This chapter covers the topic of ﬁle management. Here, you will learn how to use both

high- and low-level techniques for storing and retrieving ﬁle data. First, we talk about the

Home directory of the application. Next, we show how to enumerate the contents of a given

directory using the high-level methods of

NSFileManager. You will learn more about the

structure of the

Home directory and where you can store ﬁles. After that, you will learn how to

create and delete directories. Next, we cover the creation of ﬁles. We also cover the topic of

ﬁle and directory attributes. You will learn how to retrieve and set speciﬁc ﬁle and directory

attributes in this chapter. We also demonstrate the use of application bundles and low-level ﬁle

access.

Chapter 11 In this chapter, we will cover the basics of the SQLite database engine that is available

to you in the iPhone SDK. SQLite is an embedded database in the sense that there is no server

running, and the database engine is linked to your application. First, we describe basic SQL

statements and their implementation using SQLite function calls. Second, we discuss handling

of result sets generated by SQL statements. Third, we address the topic of prepared statements.

Fourth, we talk about extensions to the SQLite API through the use of user-deﬁned functions.

Finally, we present a detailed example for storing and retrieving BLOBs.

Chapter 12 In this chapter, you will learn how to effectively use XML in your iPhone application.

The chapter follows the same theme used in other chapters and exposes the main concepts

xviii Preface

through a working iPhone application: an RSS feed reader. First, we explain the main concepts

behind XML and RSS. Next, we present a detailed discussion of DOM and SAX parsing. After

that, we present a table-based RSS reader application. Finally, we provide a summary of the

main steps you need to take in order to effectively harness the power of XML from within

your native iPhone applications.

Chapter 13 In this chapter, we will address the topic of location awareness. First, we will talk

about the Core Location framework and how to use it to build location-aware applications.

After that, we will discuss a simple location-aware application. Next, we cover the topic of

geocoding. You will learn how to translate postal addresses into geographical locations. You

will also learn how to sample movement of the device and display that information on maps.

Next, we discuss how to relate zip codes to geographical information. Finally, we show you

how to utilize the Map Kit API to add an interactive map to your view hierarchy.

Chapter 14 In this chapter, we demonstrate the use of the several devices available on the iPhone.

We discuss the use of the accelerometer, show how to play small sound ﬁles, and show

how to play video ﬁles. After that, we discuss how to obtain iPhone and iPod touch device

information. Using the built-in camera and the photo library are also discussed in this chapter.

After that, we show you how to obtain state information regarding the battery of the device.

Finally, we discuss the proximity sensor.

Chapter 15 In this chapter, we start by looking at a step-by-step procedure for localizing strings for

a set of supported languages. Next, we look at date formatting. After that, we cover formatting

currencies and numbers. Finally, we discuss how to generate a sorted list of countries.

Chapter 16 In this chapter, we show how to marry various UI components and build custom

reusable ones. First, we show how to build an alert view with a text ﬁeld in it. Next, we

present a table view inside an alert view. Finally, we show how to build a progress alert view.

Chapter 17 This chapter addresses several advanced networking topics. We start by looking at

how we can determine network connectivity of the device. After that, we tackle the issue

of uploading multimedia content (e.g., photos) to remote servers. Next, we present a category

NSString that allows you to easily compute the MD5 digest of a string. This is important

as some services, such as Flickr, require posting parameters with the appropriate signature.

After that, we show you how to present a responsive table view whose data rows are fed

from the Internet without sacriﬁcing the user experience. Next, we address the topic of remote

and local push notiﬁcations. After that, we tackle some aspects of multitasking and use it in

downloading a large ﬁle after the application is suspended. Finally, we discuss sending email

from within an iPhone application.

Chapter 18 In this chapter, we discuss the foundation of the address book API and several

UI elements that can be used to modify the contacts database. First, we provide a brief

introduction to the subject. Next, we discuss property types. After that, we show how to access

single-value and multivalue properties. Next, we go into the details of the person record and

the address book. Issues related to multithreading and identiﬁers are then addressed. After

covering the foundation of the address book API, we provide several sample applications.

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