从入门到精通：iOS开发新手指南

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"Learning iPhone Programming (O'Reilly, 2010-3)" 是一本针对初学者的iOS开发书籍，旨在帮助读者从零基础到掌握iPhone应用开发。本书由Alasdair Allan撰写，他在iOS开发领域具有丰富的经验。这本书详细介绍了如何使用Xcode集成开发环境（IDE）和Objective-C编程语言进行iPhone应用开发。Xcode是Apple官方提供的工具，对于iOS开发者来说，它是构建和调试应用程序不可或缺的平台。Objective-C是一种强大的面向对象的编程语言，它是iOS开发的基础，因为Apple的大部分框架和API都是用Objective-C编写的。在书中，作者会引导读者了解iOS开发的基本概念，包括用户界面设计、事件处理、数据存储、网络通信以及利用Apple的Cocoa Touch框架来创建丰富的交互式用户体验。Cocoa Touch是iOS应用开发的核心，它提供了许多用于构建用户界面的类和组件，如UIKit，使得开发者可以方便地创建按钮、滑块、文本输入等元素。此外，本书还会介绍如何使用Interface Builder进行可视化布局设计，这是一个强大的工具，允许开发者通过拖放方式构建用户界面，无需编写大量代码。同时，书中的内容可能还会涉及程序调试技巧，以及如何使用版本控制工具（如Git）来管理代码，这对于团队协作和项目管理至关重要。在学习过程中，读者将逐步学习到如何处理用户输入、响应触摸事件、使用Core Data存储数据、以及实现网络请求和数据同步。Core Data是Apple提供的一种框架，用于管理应用程序的数据模型，它简化了数据持久化的过程。此外，书中可能还会涉及Apple的App Store发布流程，包括应用审核指南、隐私政策要求以及如何提交应用程序进行测试和发布。这部分内容对于开发者来说同样重要，因为理解这些规定有助于确保应用能够顺利上线并达到Apple的高质量标准。 "Learning iPhone Programming"是一本全面覆盖iOS开发的教程，适合对移动应用开发感兴趣的初学者。通过阅读本书，读者将能够掌握必要的技能，开发出自己的iPhone应用，并具备进一步深入学习和探索iOS开发复杂性的基础。

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Using Code Examples

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xiv | Preface

It seemed that the users of the applications disagreed. It’s arguable why this is the case,

but it’s very hard to make native-looking web applications that can be reused across

many different platforms, though it is possible. Just as applications on the Mac desktop

that have been ported from Windows tend to stand out like a sore thumb by not quite

working as the user expects, web applications, especially those that are intended to be

used across different platforms, tend to do the same.

If you integrate your application into the iPhone ecosphere, make use of the possibilities

that the phone offers, and optimize your user interface (UI) for the device, the user

experience is much improved. It’s also really hard to write web applications that work

well when you need to design for a smaller screen, implying as it does a simpler UI and

less exposed functionality, without using native controls.

Why Write Native Applications?

The obvious reason to use the native SDK is to do things that you can’t do on the Web.

The first generation of augmented reality applications is a case in point; these needed

close integration with the iPhone’s onboard sensors (e.g., GPS, accelerometer, digital

compass, and camera) and wouldn’t have been possible without that access. Although

the iPhone’s Safari browser supports the new geolocation capabilities HTML 5 pro

vides, this doesn’t alleviate the problem entirely. It’s doubtful that all platform-specific

hardware is going to get the same sort of treatment, so it’s unlikely that you will see the

arrival of augmented reality web applications.

If you are coming from a web development background, you may be

interested in the cross-platform PhoneGap framework. This framework

provides native wrapper classes and allows you to build native applica-

tions in HTML/JavaScript on a range of mobile platforms. One of the

platforms it targets is the iPhone. I talk about PhoneGap, and the other

alternative native development platforms for the iPhone, in Chapter 13.

Sometimes it’s not about doing things that can’t be done; it’s about doing things faster,

and doing client-side error handling. For instance, the Apple iTunes and App Store

applications that are provided with the iPhone are actually web applications wrapped

inside native applications. Just like the iTunes Store on the Mac, the main display you

see is a web page, but the surrounding infrastructure is a native application. This means

that while the application can’t do a lot without an Internet connection, it can at least

start up.

But those are extreme examples. A lot of the applications in the App Store combine

remote data and native interfaces. Without access to the network, some of the UI is

generally disabled. However, native applications can be built to degrade gracefully

when the device’s network connection disappears or if it was never present in the first

2 | Chapter 1: Why Go Native?

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