深入探索iOS 12：视图、控制器与框架实战指南

IOS12

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AVAudioEngine 804

MIDI Playback 810

Text to Speech 810

Speech to Text 811

Further Topics in Sound 814

15. Video. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 817

AVPlayerViewController 818

Other AVPlayerViewController Properties 820

Picture-in-Picture 821

Introducing AV Foundation 822

Some AV Foundation Classes 823

Things Take Time 824

Time is Measured Oddly 827

Constructing Media 827

AVPlayerLayer 833

Further Exploration of AV Foundation 836

UIVideoEditorController 836

16.

Music Library. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 839

Music Library Authorization 839

Exploring the Music Library 841

Querying the Music Library 842

Persistence and Change in the Music Library 846

Music Player 846

MPVolumeView 851

Playing Songs with AV Foundation 852

Media Picker 854

17.

Photo Library and Camera. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 857

Browsing with UIImagePickerController 857

Image Picker Controller Presentation 858

Image Picker Controller Delegate 859

Dealing with Image Picker Controller Results 861

Photos Framework 862

Querying the Photo Library 863

Modifying the Library 866

Being Notified of Changes 868

Fetching Images 869

Editing Images 873

Photo Editing Extension 878

Using the Camera 879

xiv | Table of Contents

Capture with UIImagePickerController 880

Capture with AV Foundation 883

18. Contacts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 889

Contact Classes 889

Fetching Contact Information 891

Fetching a Contact 891

Repopulating a Contact 892

Labeled Values 893

Contact Formatters 893

Saving Contact Information 894

Contact Sorting, Groups, and Containers 895

Contacts Interface 896

CNContactPickerViewController 897

CNContactViewController 899

19. Calendar. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 903

Calendar Database Contents 904

Calendars 904

Calendar Items 905

Calendar Database Changes 905

Creating Calendars, Events, and Reminders 906

Events 906

Alarms 907

Recurrence 908

Reminders 909

Proximity Alarms 910

Fetching Events and Reminders 911

Calendar Interface 912

EKEventViewController 912

EKEventEditViewController 913

EKCalendarChooser 914

20.

Maps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 917

Displaying a Map 917

Annotations 921

Customizing an MKMarkerAnnotationView 922

Changing the Annotation View Class 924

Custom Annotation View Class 925

Custom Annotation Class 927

Annotation View Hiding and Clustering 928

Other Annotation Features 930

Table of Contents | xv

Overlays 931

Custom Overlay Class 933

Custom Overlay Renderer 935

Other Overlay Features 937

Map Kit and Current Location 938

Communicating with the Maps App 940

Geocoding, Searching, and Directions 941

Geocoding 942

Searching 943

Directions 944

21.

Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 947

Core Location 948

Location Manager, Delegate, and Authorization 948

Location Tracking 953

Where Am I? 956

Background Location 957

Heading 961

Acceleration, Attitude, and Activity 963

Shake Events 964

Using Core Motion 965

Raw Acceleration 966

Gyroscope 970

Other Core Motion Data 975

Part IV. Final Topics

22.

Persistent Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 983

The Sandbox 983

Standard Directories 983

Inspecting the Sandbox 984

Basic File Operations 985

Saving and Reading Files 986

User Defaults 993

Simple Sharing and Previewing of Files 995

File Sharing 995

Document Types and Receiving a Document 996

Handing Over a Document 999

Previewing a Document 1000

Quick Look Previews 1001

Document Architecture 1002

xvi | Table of Contents

A Basic Document Example 1004

iCloud 1008

Document Browser 1011

Custom Thumbnails 1014

Custom Previews 1016

Document Picker 1018

XML 1019

JSON 1021

SQLite 1026

Core Data 1027

PDFs 1034

Image Files 1035

23. Basic Networking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1039

HTTP Requests 1039

Obtaining a Session 1039

Session Configuration 1041

Session Tasks 1042

Session Delegate 1044

HTTP Request with Task Completion Function 1045

HTTP Request with Session Delegate 1047

One Session, One Delegate 1049

Delegate Memory Management 1050

Session and Delegate Encapsulation 1051

Downloading Table View Data 1055

Background Session 1057

On-Demand Resources 1060

In-App Purchases 1063

24.

Threads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1069

Main Thread 1069

Background Threads 1071

Why Threading Is Hard 1073

Blocking the Main Thread 1074

Manual Threading 1076

Operation 1078

Grand Central Dispatch 1083

Commonly Used GCD Methods 1086

Synchronous Execution 1086

Dispatch Groups 1087

One-time Execution 1088

Concurrent Queues 1089

Table of Contents | xvii

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