Xcode 5与iOS 7开发：《iOS Programming (第四版)》Big Nerd Ranch指南

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"iOS Programming （第四版英文版）- The Big Nerd Ranch Guide 4ed" 《iOS Programming （第四版英文版）- The Big Nerd Ranch Guide 4ed》是一本针对iOS开发的权威指南，由Christian Keur、Aaron Hillegass和Joe Conway撰写。这本书专为使用Xcode 5及在iOS 7设备或模拟器上运行应用的读者设计。第四版对内容进行了全面更新，以适应苹果不断进化的iOS系统。在这一版本中，作者们采用了更现代的Objective-C编程风格。他们广泛使用了属性（properties）、点号表示法（dot notation）、自动合成的实例变量（auto-synthesized instance variables）、新的字面量（literal）以及下标扩展（subscripting）。此外，书中也大量使用了块（blocks）。苹果公司在iOS的发展中引入了许多新特性，本书对此进行了详细覆盖，包括基于块的动画（block-based animations）、自动布局（Auto Layout）以及NSURLSession。这些更新使得开发者能够更好地理解和利用这些新功能来构建高性能的iOS应用。除了明显的改动，作者还根据读者和学生的反馈进行了数千处细微的改进。每一章都比第三版有所提升，确保了内容的准确性和实用性。此外，该书版权由Big Nerd Ranch, LLC所有，并由Pearson Technology Group在全球独家发行英文版。作者和出版商虽然在编写和印刷过程中已尽职尽责，但并不提供任何形式的明示或暗示保修，也不承担因错误或遗漏导致的直接或间接损失责任。《iOS Programming （第四版英文版）- The Big Nerd Ranch Guide 4ed》是iOS开发者的重要参考资料，它提供了最新技术和实践的深入指导，帮助开发者跟上iOS平台的快速发展。

Our Teaching Philosophy

This book will teach you the essential concepts of iOS programming. At the same time, you will type

in a lot of code and build a bunch of applications. By the end of the book, you will have knowledge

and experience. However, all the knowledge should not (and, in this book, will not) come first. That

is sort of the traditional way we have all come to know and hate. Instead, we take a learn-while-

doing approach. Development concepts and actual coding go together.

Here is what we have learned over the years of teaching iOS programming:

We have learned what ideas people must grasp to get started programming, and we focus on that

subset.

We have learned that people learn best when these concepts are introduced as they are needed.

We have learned that programming knowledge and experience grow best when they grow

together.

We have learned that “going through the motions” is much more important than it sounds. Many

times we will ask you to start typing in code before you understand it. We realize that you may

feel like a trained monkey typing in a bunch of code that you do not fully grasp. But the best way

to learn coding is to find and fix your typos. Far from being a drag, this basic debugging is where

you really learn the ins and outs of the code. That is why we encourage you to type in the code

yourself. You could just download it, but copying and pasting is not programming. We want

better for you and your skills.

What does this mean for you, the reader? To learn this way takes some trust. And we appreciate

yours. It also takes patience. As we lead you through these chapters, we will try to keep you

comfortable and tell you what is happening. However, there will be times when you will have to take

our word for it. (If you think this will bug you, keep reading – we have some ideas that might help.)

Do not get discouraged if you run across a concept that you do not understand right away. Remember

that we are intentionally not providing all the knowledge you will ever need all at once. If a concept

seems unclear, we will likely discuss it in more detail later when it becomes necessary. And some

things that are not clear at the beginning will suddenly make sense when you implement them the first

(or the twelfth) time.

People learn differently. It is possible that you will love how we hand out concepts on an as-needed

basis. It is also possible that you will find it frustrating. In case of the latter, here are some options:

Take a deep breath and wait it out. We will get there, and so will you.

Check the index. We will let it slide if you look ahead and read through a more advanced

discussion that occurs later in the book.

Check the online Apple documentation. This is an essential developer tool, and you will want

plenty of practice using it. Consult it early and often.

If Objective-C or object-oriented programming concepts are giving you a hard time (or if you

think they will), you might consider backing up and reading our Objective-C Programming: The

Big Nerd Ranch Guide.

How This Book is Organized

In this book, each chapter addresses one or more ideas of iOS development through discussion and

hands-on practice. For more coding practice, most chapters include challenge exercises. We

encourage you to take on at least some of these. They are excellent for firming up the concepts

introduced in the chapter and making you a more confident iOS programmer. Finally, most chapters

conclude with one or two “For the More Curious” sections that explain certain consequences of the

concepts that were introduced earlier.

Chapter 1 introduces you to iOS programming as you build and deploy a tiny application. You will

get your feet wet with Xcode and the iOS simulator along with all the steps for creating projects and

files. The chapter includes a discussion of Model-View-Controller and how it relates to iOS

development.

Chapters 2 and 3 provide an overview of Objective-C and memory management. Although you will

not create an iOS application in these two chapters, you will build and debug a tool called RandomItems

to ground you in these concepts.

In Chapters 4 and 5, you will begin focusing on the iOS user interface as you learn about views and

the view hierarchy and create an application called Hypnosister.

Chapters 6 and 7 introduce view controllers for managing user interfaces with the HypnoNerd

application. You will get practice working with views and view controllers as well as navigating

between screens using a tab bar. You will also get plenty of experience with the important design

pattern of delegation as well as working with protocols, the debugger, and setting up local

notifications.

Chapter 8 introduces the largest application in the book – Homepwner. (By the way, “Homepwner” is

not a typo; you can find the definition of “pwn” at www.urbandictionary.com.) This application keeps

a record of your possessions in case of fire or other catastrophe. Homepwner will take fourteen chapters

to complete.

In Chapters 8, 9, and 19, you will build experience with tables. You will learn about table views,

their view controllers, and their data sources. You will learn how to display data in a table, how to

allow the user to edit the table, and how to improve the interface.

Chapter 10 builds on the navigation experience gained in Chapter 6. You will learn how to use

UINavigationController and you will give Homepwner a drill-down interface and a navigation bar.

In Chapter 11, you will learn how to take pictures with the camera and how to display and store

images in Homepwner. You will use NSDictionary and UIImagePickerController.

In Chapters 12 and 13, you will set Homepwner aside for a bit to create a drawing application named

TouchTracker to learn about touch events. You will see how to add multi-touch capability and how to

use UIGestureRecognizer to respond to particular gestures. You will also get experience with the

first responder and responder chain concepts and more practice with NSDictionary.

In Chapter 14, you will learn how to use debug gauges, Instruments, and the static analyzer to optimize

the performance of TouchTracker.

In Chapters 15 and 16, you will make Homepwner a universal application – an application that runs

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