iPhone开发者转型iPad：掌握全新的SDK指南

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"《 Beginning.iPad.Development.for.iPhone.Developers.Mastering.the.iPad.SDK》是一本专为iPhone开发者设计的指南，旨在帮助他们掌握iPad应用开发的全新技能。本书共分为12章，涵盖了iPad开发的各个方面，旨在适应由iPhone到iPad这一平台的重大转变。第1章"欢迎来到范式转变"介绍了iPad带来的新机遇，强调了开发策略的调整，以及如何适应平板设备独特的用户体验。第2章"开始iPad开发之旅"为初学者提供了入门指导，包括设置开发环境、安装必要的工具和库，以及基本的项目设置。第3章"探索iPhone SDK的新iPad特性"着重于那些专门为iPad优化的功能，如更大的屏幕尺寸和多任务处理能力的利用。第4章"新图形功能"讲解了如何利用iPad的高性能图形处理器实现更丰富的视觉效果和图形渲染技术。第5章"使用Core Text"展示了如何在iPad上创建美观且易于阅读的文本渲染，包括自定义字体和排版。第6章"Popovers"介绍了这种非全屏弹出窗口的交互方式，有助于提供灵活的信息显示和操作界面。第7章"视频和显示输出"涉及多媒体内容的集成，包括视频播放、屏幕录制和显示控制的相关技术。第8章"Split Views和Modal Modes"讨论了两种重要的布局模式，分别适用于需要同时展示多个视图的应用场景和模态对话框的管理。第9章"新的输入方法"探讨了针对iPad触控屏优化的各种输入手段，如手势识别、虚拟键盘和多指操作。第10章"与文档交互"涵盖了如何在iPad上处理和存储数据，包括云同步和离线访问的策略。第11章"从iPhone到iPad：迁移与兼容性"讲述了如何在保持原有iPhone应用基础上，实现跨平台的无缝迁移和优化。第12章"iPad开发的额外资源"为读者提供了进一步学习和实践的外部链接、工具推荐以及社区支持。《Beginning.iPad.Development.for.iPhone.Developers.Mastering.the.iPad.SDK》不仅详细阐述了开发技巧，还深入解析了iPad SDK的核心组件，确保读者能够充分利用这个全新的开发平台，打造能充分展现iPad魅力的应用程序。通过本书，iPhone开发者可以迅速提升自己的技能，满足日益增长的平板市场需求。"

CHAPTER 1: Welcome to the Paradigm Shift

small form factor. Running Microsoft Windows or a Linux-based operating system,

netbooks don’t make computing any easier than laptops. Their only advantage is that

they’re more affordable.

A thin tablet device is much more intimate than a laptop or netbook, and it can be easily

held from almost any angle—on a couch or in bed, for example. And I’m willing to bet

that some of you even take your iPad into the bathroom for a little quality time, surfing

the Web and reading e-books.

The iPad is certainly not the first computer tablet to hit the market, and it won’t be the

last. Since the early 1990s, countless companies have attempted to lure consumers with

feature-packed tablet models, but none of them were ever successful. Why? Because

the software was either limited in functionality or too difficult to use.

In 1993, Apple launched the Newton MessagePad, its first stab at a tablet. With its

monochrome screen and limited selection of software, it was largely perceived as a big

PDA, rather than a true mobile computer. Since the product never seemed to grow

beyond a small, yet loyal, cult following, Apple discontinued Newton development in 1998.

Most of the other hardware companies that followed with their own tablets tried a different

approach. Running on various flavors of Windows or Linux, those tablets were powerful

computers, but were ultimately not the right mobile solution for most consumers. Like

Apple’s Newton, many of them required the use of a stylus pen in order to accurately tap

the tiny on-screen buttons and menu options. The underlying problem was that those

desktop operating systems were never designed for a finger-driven touchscreen. From a

usability standpoint, a cursor-based desktop operating system is a very cumbersome

interface for a mobile tablet device that’s typically operated with one hand.

It’s All About the Software

When rumors first started circulating back in 2009 about the development of a

mysterious Apple tablet, the big question was which operating system it would run. With

a larger screen, it could certainly handle Mac OS X, and I must admit, a small part of me

had secretly hoped that Apple would announce a Mac-based tablet, so that I could run

my favorite Mac apps on it. But as a developer, I’m not the average consumer. If Apple

had released the iPad as a Mac OS X-powered device, it would surely have met the

same lukewarm reception as the countless tablets that came before it.

But Apple is smarter than that. To succeed, Apple knew this new class of mobile device

had to be easier to use than a laptop, yet more powerful than a smartphone. To achieve

this, the tablet needed an operating system that was engineered from the ground up for

multitouch finger gestures and efficient touchscreen navigation. One of Apple’s greatest

strengths as a technology company is that it controls the design of both the hardware

and the software, always striving for a seamless marriage between the two. The iPad is

a perfect example of that ideology.

adapting mouse-driven desktop software to a touchscreen environment. With millions of

iPhone and iPod touch users already familiar with the iOS interface, there’s an

CHAPTER 1: Welcome to the Paradigm Shift

immediate comfort level with the iPad. It looks easy to use because it is. When Apple

first announced the iPad, the tablet’s emphasis on simplicity seemed to underwhelm

some critics, but that is the very element that will make it a game-changer in the world of

mobile computing.

The iPad Is Not a Big iPod touch

The naysayers who are skeptical of the iPad’s future—merely passing it off as a big iPod

touch—are the ones who don't get it. They don't see the big picture here. The instant-on

iOS proved ideal for a small smartphone device, and it will prove even more effective for

the iPad’s larger screen. But don’t be fooled by its deceptive exterior. Sure, it may look

like a super-sized iPod touch, but under the hood, the iPad boasts a powerful graphics

engine and Apple’s speedy, battery-optimized A4 processor.

The iPad is not just about games. Even though games have made the iPod touch a

dominant force in portable gaming, and many of those titles will be optimized for Apple’s

tablet, I believe the iPad will become a popular platform for productivity apps—even

more so than the iPhone.

Beyond the convenience of the larger display and full-size touchscreen keyboard,

iPhone SDK 3.2 includes iPad support for Core Text and several other exciting new

frameworks and user interface niceties that make it much easier to develop feature-rich

productivity apps. Apple has set the stage for the iPad to become the portable

computer of choice for not only the general public, but also doctors, teachers, students,

salespeople, scientists, pilots, engineers, and countless other markets.

Apple hinted as much with its new iWork suite for the iPad (see Figure 1–1). By

delivering sophisticated iPad versions of its Mac counterparts (Keynote, Pages, and

Numbers), iWork is Apple’s shot across the bow at critics, proving its new tablet is so

much more than just a glorified iPod.

When a laptop is too unwieldy or too heavy to carry around all day, the iPad is a much

more practical form factor, capable of running state-of-the-art, desktop-caliber

applications. And with the simplicity of the iOS interface, this new class of mobile apps

will increase productivity and provide a much more intimate and immersive experience

that is easily accessible to even the most nontechnical neophytes.

CHAPTER 1: Welcome to the Paradigm Shift

Personal Computing for the Masses

When exploring the new iPad-centric SDK features in later chapters, you’ll immediately

see that Apple has provided extensive tools for creating very robust apps. With this

newfound power at your fingertips, many of you may be inclined to build apps that

mimic traditional desktop interface models, derived from years of programming for Mac

OS X, Microsoft Windows, or Linux. Even though the iPad platform removes many of the

user interface design restraints and memory limitations that developers grappled with on

the iPhone, this would be entirely the wrong approach.

There’s a reason Apple used iOS instead of Mac OS X as the iPad’s operating system.

Beyond the fact that it was designed for a finger-based touchscreen, iOS also serves

another valuable role. Unlike traditional desktop operating systems, iOS hides the

filesystem from users, placing the focus instead on content.

Although many see the iPad as a mere laptop replacement, I believe Apple’s new tablet

was designed with a more ambitious goal: to reinvent mainstream personal computing,

much like the original Mac did back in 1984. Apple feels that computers have become

far too complicated for the average consumer and aims to simplify the experience.

Although desktop operating systems like Mac OS X will continue to thrive for years to

come, the iPad presents a major paradigm shift in computing.

The iPad was designed for people who don’t like using computers. And yet it’s packed

with enough engineering muscle to easily accommodate the needs of power users. In a

nutshell, the iPad is the portable, personal computer for everyone.

The genius of the iPad is in its sheer simplicity. I know I’ve mentioned this a few times

already, but it is the single most important factor to remember when developing apps for

this new device. A major component in Apple’s strategy to deliver a more organic and

intuitive user experience is incorporating real-world metaphors into the interface design

process. A good example of this is Apple’s preinstalled Notes app (see Figure 1–2).

A computer newbie could launch the Notes app for the first time and immediately figure

out how to use it, without the need for any instructions or prior computer knowledge.

Your grandparents could use this app! To make the experience fun, Apple even added

realistic graphical flourishes, such as the stitched-leather binder that holds both the

yellow, lined notepad and the white, card-based notes list. And marking the currently

selected note with a “hand-drawn” red circle is a nice touch!

Apple encourages developers to embrace this sea change in their own app interface

designs as well. Obviously, integrating real-world objects, imagery, and textures to

communicate functionality won’t be practical in every scenario, but the primary objective

is clear: keep it simple. Remember this fundamental rule as you mull over potential app

ideas to develop. We’ll be exploring additional user interface design considerations in

Chapter 3.

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