iOS 9开发宝典：最新版Matt Neuburg第六版编程指南

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《编程iOS 9：第六版》是由Matt Neuburg编写的，该书是针对iOS开发领域的一本权威指南，专为2015年11月发布的iOS 9系统设计。这本书在技术更新快速的iOS开发界具有很高的实用价值，对于任何想要深入理解和掌握iOS开发技术的程序员来说都是不可或缺的资源。第六版的内容覆盖了iOS 9的新特性和API，包括但不限于Swift语言的进一步应用、界面设计的改进、以及与Apple生态系统的集成。书中详细介绍了Objective-C和Swift这两种主要的iOS开发语言，帮助开发者理解并掌握这两种语言在新版本中的使用技巧和最佳实践。章节可能包括以下几个部分： 1. **iOS 9概述**：介绍了新版本的系统架构，安全特性，以及与之前版本的对比和升级点。 2. **Swift语言指南**：针对Swift语言的新特性进行了深入解析，包括函数式编程、可选类型、泛型等。 3. **AppKit和UIKit**：讲解如何利用新功能优化用户界面，如故事板的使用，以及自定义视图控制器的实现。 4. **Foundation框架升级**：介绍Core Data、URLSession、HealthKit等框架的最新API，以及如何高效地处理数据和用户健康信息。 5. **Core Services和框架整合**：探讨如何与Maps、Safari、Apple Pay等服务进行无缝集成。 6. **性能优化和调试**：提供针对iOS 9平台性能调优的实用策略，包括内存管理、CPU效率和能耗控制。 7. **测试和部署**：涵盖了Xcode和TestFlight的最新工具，以及如何进行有效的应用测试和发布流程。 8. **案例研究和实战项目**：通过实际项目演示，让读者在实践中巩固所学知识。作为一本不断更新的技术书籍，作者确保了内容的时效性和实用性，而且提供了在线资源链接，方便读者获取最新的错误修正和补充内容。无论是对于初学者还是经验丰富的开发者，阅读《编程iOS 9：第六版》都能从中获益匪浅，提升iOS开发技能，适应苹果生态系统的发展。如果你无法直接下载此书，可以联系企鹅137019175寻求帮助。

Custom Overlay Renderer 849

Other Overlay Features 851

Map Kit and Current Location 852

Communicating With the Maps App 854

Geocoding, Searching, and Directions 855

Geocoding 855

Searching 856

Directions 857

22.

Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 859

Core Location 860

Location Manager and Delegate 861

Core Location Authorization 861

Location Tracking 864

Where Am I? 865

Heading 867

Background Location 869

Acceleration, Attitude, and Activity 873

Shake Events 873

Raw Acceleration 874

Gyroscope 879

Motion Activity 884

Part IV. Final Topics

23.

Persistent Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 889

The Sandbox 889

Standard Directories 889

Visually Inspecting the Sandbox 891

Basic File Operations 892

Saving and Reading Files 892

User Defaults 894

Simple Sharing and Previewing of Files 897

File Sharing 897

Document Types and Receiving a Document 898

Handing Over a Document 901

Previewing a Document 901

Document Architecture 903

iCloud 909

xiv | Table of Contents

XML 911

SQLite 916

Core Data 917

Image File Formats 923

24. Basic Networking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 927

HTTP Requests 928

Simple HTTP Request 930

Formal HTTP Request 931

Encapsulating the Session, Task, and Delegate 935

Downloading Table View Data 940

Background Downloads 943

Background App Refresh 946

On-Demand Resources 947

In-App Purchases 948

25. Threads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 953

Main Thread 953

Why Threading Is Hard 956

Blocking the Main Thread 957

Manual Threading 960

NSOperation 962

Grand Central Dispatch 966

Threads and App Backgrounding 972

26.

Undo. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 975

Undo Manager 975

Target–Action Undo 976

Undo Grouping 978

Invocation Undo 979

Functional Undo 980

Undo Interface 982

Shake-To-Edit 982

Undo Menu 983

A. Application Lifetime Events. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 985

B. Some Useful Utility Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 993

Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1001

Table of Contents | xv

Aut lego vel scribo; doceo scrutorve sophian.

—Sedulius Scottus

Preface

On June 2, 2014, Apple’s WWDC keynote address ended with a shocking announce‐

ment: “We have a new programming language.” This came as a huge surprise to the

developer community, which was accustomed to Objective-C, warts and all, and

doubted that Apple could ever possibly relieve them from the weight of its venerable

legacy. The developer community, it appeared, had been wrong.

Having picked themselves up off the floor, developers immediately began to examine

this new language — Swift — studying it, critiquing it, and deciding whether to use it.

My own first move was to translate all my existing iOS apps into Swift; this was enough

to convince me that, for all its faults, Swift deserved to be adopted by new students of

iOS programming, and that my books, therefore, should henceforth assume that readers

are using Swift.

Therefore, Swift is the programming language used throughout this book. Nevertheless,

the reader will also need some awareness of Objective-C (including C). The Foundation

and Cocoa APIs, the built-in commands with which your code must interact in order

to make anything happen on an iOS device, are still written in C and Objective-C. In

order to interact with them, you have to know what those languages would expect. For

example, in order to pass a Swift array where an Objective-C NSArray is expected, you

need to know what consitutes an object acceptable as an element of an Objective-C

NSArray.

If you don’t already know the Swift language and how it interacts with Objective-C,

you’ll want to start with my other book, iOS 9 Programming Fundamentals with Swift.

It is both an introduction and a companion to Programming iOS 9. Like Homer’s Iliad,

Programming iOS 9 begins in the middle of the story, with the reader jumping with all

four feet into views and view controllers, and with a knowledge of the language and the

Xcode IDE already presupposed. Discussion of the programming language, as well as

the Xcode IDE (including the nature of nibs, outlets, and actions, and the mechanics of

xvii

nib loading), plus the fundamental conventions, classes, and architectures of the Cocoa

Touch framework (including delegation, the responder chain, key–value coding, mem‐

ory management, and so on) — material that constituted Chapters 1–13 in the early

editions of this book, but whose presence was eventually deemed to be making the book

unwieldy in size and scope — has now been relegated to iOS 9 Programming Funda‐

mentals with Swift.

So if something appears to be missing from this book, that’s why! If you start reading

Programming iOS 9 and wonder about such unexplained matters as Swift language

basics, the UIApplicationMain function, the nib-loading mechanism, Cocoa patterns

of delegation and notification, and retain cycles, wonder no longer — I don’t explain

them here because I have already explained them in iOS 9 Programming Fundamentals

with Swift. If you’re not sufficiently conversant with those topics, I’d suggest that you

might want to read that book first; you will then be completely ready for this one.

The Scope of This Book

To a large extent, iOS 9 represents a pause in the steady march of revisions, often quite

radical, that Apple has felt free to introduce with every major system update since iOS

3. In my opinion, this is all to the good. iOS 9, for the most part, is not terribly different

from iOS 8. Instead, it consists mostly of fairly small but valuable rationalizations of

iOS 8, giving the system’s growth and development a chance to catch up with itself. For

example:

• iOS 9 introduces a new notation for describing a layout constraint.

• iOS 9 expands the power of UIKit dynamics.

• iOS 9 implements unwind segues in such a way that they actually work.

In addition, many small bugs are fixed; these fixes do nothing for those who want their

apps to run under iOS 8, but they are welcome nonetheless. To cite just one instance,

UIProgressView custom progress images, which stopped working in iOS 7, are working

once again in iOS 9.

iOS 9 also brings some important linguistic improvements. A major issue that had to

be worked around in the previous edition of this book, covering iOS 8 and Swift 1.2,

was that not every C and Objective-C API could be called from Swift, necessitating the

frequent use of Objective-C “helper” methods. But in iOS 9 and Swift 2.0, this is no

longer the case; I’m happy to say that no Objective-C code appears in this edition.

iOS 9 does introduce a few grand sweeping innovations, such as App Transport Security

and iPad multitasking; I am less happy with these, but of course I do document them

nonetheless.

Here’s a summary of this book’s major sections:

xviii | Preface

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