深入探索iOS 11、Xcode 9与Swift 4编程实战指南

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15. Video. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 819

AVPlayerViewController 820

Other AVPlayerViewController Properties 821

Picture-in-Picture 823

Introducing AV Foundation 825

Some AV Foundation Classes 825

Things Take Time 826

Time is Measured Oddly 828

Constructing Media 829

Synchronizing Animation with Video 831

AVPlayerLayer 833

Further Exploration of AV Foundation 835

UIVideoEditorController 835

16.

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

Music Library Authorization 839

Exploring the Music Library 842

Querying the Music Library 842

Persistence and Change in the Music Library 846

Music Player 846

MPVolumeView 851

Playing Songs with AV Foundation 851

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 864

Modifying the Library 866

Being Notified of Changes 869

Fetching Images 870

Editing Images 873

Photo Editing Extension 878

Using the Camera 880

Capture with UIImagePickerController 880

Capture with AV Foundation 884

18.

Contacts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 889

Contact Classes 889

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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 894

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 and Events 906

Recurrence 908

Fetching Events 910

Reminders 911

Proximity Alarms 912

Calendar Interface 913

EKEventViewController 913

EKEventEditViewController 914

EKCalendarChooser 915

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 926

Annotation View Hiding and Clustering 927

Other Annotation Features 929

Overlays 931

Custom Overlay Class 932

Custom Overlay Renderer 935

Other Overlay Features 936

Map Kit and Current Location 937

Communicating with the Maps App 939

Geocoding, Searching, and Directions 940

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Geocoding 941

Searching 942

Directions 943

21. Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 945

Core Location 946

Location Manager, Delegate, and Authorization 946

Location Tracking 951

Where Am I? 954

Background Location 955

Heading 961

Acceleration, Attitude, and Activity 962

Shake Events 963

Using Core Motion 964

Raw Acceleration 965

Gyroscope 969

Other Core Motion Data 974

Part IV. Final Topics

22.

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

The Sandbox 983

Standard Directories 983

Inspecting the Sandbox 985

Basic File Operations 986

Saving and Reading Files 987

User Defaults 993

Simple Sharing and Previewing of Files 996

File Sharing 996

Document Types and Receiving a Document 996

Handing Over a Document 999

Previewing a Document 1000

Quick Look Previews 1001

Document Architecture 1003

A Basic Document Example 1005

iCloud 1008

Document Browser 1011

Custom Thumbnails 1015

Custom Previews 1016

XML 1018

JSON 1020

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SQLite 1024

Core Data 1025

PDFs 1031

Image Files 1033

23. Basic Networking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1035

HTTP Requests 1036

Obtaining a Session 1036

Session Configuration 1037

Session Tasks 1038

Session Delegate 1040

HTTP Request with Task Completion Function 1042

HTTP Request with Session Delegate 1043

One Session, One Delegate 1046

Delegate Memory Management 1047

Downloading Table View Data 1050

Background Session 1053

On-Demand Resources 1056

In-App Purchases 1059

24.

Threads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1065

Main Thread 1065

Why Threading Is Hard 1069

Blocking the Main Thread 1070

Manual Threading 1073

Operation 1075

Grand Central Dispatch 1079

Commonly Used GCD Methods 1081

Concurrent Queues 1084

Checking the Queue 1085

Threads and App Backgrounding 1086

25.

Undo. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1089

Undo Manager 1090

Target–Action Undo 1090

Undo Grouping 1092

Functional Undo 1093

Undo Interface 1095

Shake-To-Edit 1095

Undo Menu 1096

A. Application Lifetime Events. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1099

Table of Contents | xvii

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