Swift编程探索：iOS SDK深度开发指南

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"More.iPhone.Development.with.Swift.Exploring.the.iOS.SDK" 这本书《More iPhone Development with Swift》深入探讨了Apple的Swift编程语言和iOS 8 SDK，旨在帮助无论是初学者还是经验丰富的开发者提升iOS应用开发技能。作者Dave Mark、Jeff LaMarche和团队以他们一贯的友好和易懂的写作风格，详细解释了复杂的概念和技术。书中涵盖了以下几个关键知识点： 1. **Swift编程语言**：介绍Swift的基础和进阶特性，帮助读者理解如何在实际项目中有效利用这个现代编程语言。 2. **Core Data**：详细讲解Core Data的关键概念、技术和实践，包括如何构建更大规模的应用程序。 3. **iOS SDK**：展示如何结合Swift和新SDK来开发应用，涵盖网络机制，例如使用Multipeer Connectivity进行蓝牙/WiFi的对等连接。 4. **并发编程**：讨论多线程和并发编程的最佳实践，这对于优化iOS应用性能至关重要。 5. **调试技巧**：介绍高级调试技术，帮助开发者识别和修复应用程序中的问题。 6. **网络数据处理**：涵盖了从Web和云端获取数据的方法，包括Apple的iCloud集成。 7. **地图服务**：通过MapKit章节，学习如何在应用中集成地图功能。 8. **消息传递**：讲解如何集成邮件、社交和iMessage服务，实现应用内的通信功能。 9. **媒体库访问和播放**：教授如何访问和播放用户的媒体库内容。 10. **相机集成**：介绍如何实现实时预览和条形码扫描功能，提升应用的多媒体交互性。 11. **用户界面设计**：探讨Interface Builder和Storyboards在构建应用界面中的应用。 12. **单元测试与调试工具**：介绍如何使用Xcode的测试框架和Instruments工具进行测试和性能分析。 13. **章节结构**：书中的16个章节逐步引导读者从基础到高级，逐步深入iOS开发的各个重要领域。这本书适合已经阅读过《Beginning iPhone Development with Swift》或有一定Swift和iOS SDK基础的读者。通过本书，开发者可以提升自己的Swift编程能力，掌握iOS应用开发的更多高级技巧。

13CHAPTER 2: Core Data: What, Why, and How

Figure 2-4. Choose a location to put your project

Figure 2-5. Voilà, your project is ready!

15CHAPTER 2: Core Data: What, Why, and How

Core Data Concepts and Terminology

Like most complex technologies, Core Data has its own terminology that can be a bit

confusing to newcomers. Let’s break down the mystery and get your arms around Core

Data’s nomenclature.

Figure 2-7 shows a simplified, high-level diagram of the Core Data architecture. Don’t expect

it all to make sense now, but as you look at different pieces, you might want to refer to this

diagram to cement your understanding of how they fit together.

There are five key concepts to focus on here. As you proceed through this chapter, make

sure you understand each of the following:

Data model

Persistent store

Persistent store coordinator

Managed object and managed object context

Fetch request

Persistent

Store

Data

Model

Persistent

Store

Coordinator

Entity

Description

Based on

Managed Objects Context

Retrieves

Fetch Request

Predicates

Managed

Objects

Figure 2-7. The Core Data architecture

Once again, don’t let the names throw you. Follow along and you’ll see how all these pieces

fit together.

The Data Model

What is a data model? In an abstract sense, it’s an attempt to define the organization of data

and the relationship between the organized data components. In Core Data, the data model

defines the data structure of objects, the organization of those objects, the relationships

between those objects, and the behavior of those objects. Xcode allows you, via the model

editor and inspector, to specify your data model for use in your application.

If you expand the CoreDataApp group in the Navigator content pane, you’ll see a file

called CoreDataApp.xcdatamodel. This file is the default data model for your project. Xcode

created this file for you because you selected the Use Core Data check box in the Project

Configuration sheet. Single-click CoreDataApp.xcdatamodel to bring up Xcode’s model editor.

Make sure the Utility pane is visible (it should be the third button on the View bar) and select

the inspector. Your Xcode window should look like Figure 2-8.

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Swift编程探索：iOS SDK深度开发指南

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