Jesse Feiler
Implementing iOS and macOS Documents with the Files AppManaging Files and Ensuring Compatibility
Jesse Feiler
Plattsburgh, NY, USA
ISBN 978-1-4842-4491-3e-ISBN 978-1-4842-4492-0
https://doi.org/10.1007/978-1-4842-4492-0
© Jesse Feiler 2019
This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed.
Trademarked names, logos, and images may appear in this book. Rather than use a trademark symbol with every occurrence of a trademarked name, logo, or image we use the names, logos, and images only in an editorial fashion and to the benefit of the trademark owner, with no intention of infringement of the trademark. The use in this publication of trade names, trademarks, service marks, and similar terms, even if they are not identified as such, is not to be taken as an expression of opinion as to whether or not they are subject to proprietary rights.
While the advice and information in this book are believed to be true and accurate at the date of publication, neither the authors nor the editors nor the publisher can accept any legal responsibility for any errors or omissions that may be made. The publisher makes no warranty, express or implied, with respect to the material contained herein.
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Table of Contents

Chapter 1:​ Using Documents 1
Describing a Document 1
Keeping Track of a Document and Its Data 2
Structuring a Document 2
Handling Document Versions 3
Comparing Documents and Files 3
Structuring a Document and an App 3
Summary 4
Chapter 2:​ Looking Inside a Document 5
Using JSON Encoding 5
Introducing JSON 6
JSON and Swift 7
Using Swift Structs 7
Encoding JSON 9
Decoding JSON 10
Putting the Encoding and Decoding Together 11
Summary 12
Chapter 3:​ Matching a Document to a Document Format 13
Preparing for iCloud 13
Setting Up Your Document in Your App 15
Managing Document Types 17
Looking at info.​plist 20
Summary 23
Chapter 4:​ Securing and Protecting Data 25
Security and Privacy Overview 25
Case Study:​ Using Cocoa Location Services 26
Summary 33
Chapter 5:​ Implementing Documents on macOS:​ NSDocument 35
Differences Between iOS UIDocuments and macOS NSDocuments 36
Creating a Document-Based App on macOS 36
Adding Code to Your macOS App 40
AppDelegate 40
ViewController 42
Document 43
Storyboard 46
Overview of macOS and iOS Development 47
Summary 48
Chapter 6:​ Implementing Documents on iOS 49
Using Files and the iOS File System 49
Choosing Document Storage Locations 51
Browsing Documents 52
Looking at Recent Documents 55
Viewing Files and Folders for an App 58
Summary 60
Chapter 7:​ Implementing Documents on iOS:​ UIDocument and UIDocumentBrowse​r ViewController 61
Creating a Document-Based App 62
Introducing UIDocument 68
Working with UIDocument 68
Working with UIDocumentViewCo​ntroller 71
Opening the Document 72
Closing the Document 74
Working with UIDocumentBrowse​rView Controller 74
Loading the UIDocumentBrowse​rViewController 74
Creating a Document 76
Picking (Opening) a Document 79
Handling Errors 82
Summary 82
Chapter 8:​ Sharing Documents with Share Buttons 83
Using Share Buttons (As a User) 83
Creating a Sharing Example 84
Sharing the Data 95
Summary 98
Chapter 9:​ Using User Defaults, Settings, and Preferences 99
Looking at the Data Structures 100
Exploring User Defaults, Preferences, and Settings 102
Understanding User Defaults 102
Exploring Settings 103
Using Preferences 103
Preferences and Settings:​ A Case Study 104
Creating the PreferencesApp 104
Adding a Settings Bundle 107
Accessing the Settings Bundle from Your Code 116
Adding a Settings Interface 119
Summary 121
Chapter 10:​ Working with File Wrappers and Packages 123
Using Packages 123
Considering Bundles 128
Using File Wrappers 128
Summary 131
Chapter 11:​ Using File Archives 133
Using Swift Unified Logging 134
Using Log and a Breakpoint to Archive Data 136
Selecting the Item to Archive 140
Creating the Object to Archive 142
Doing the Archive 146
Making the Class Conform to NSCoding 146
Implementing the Example 149
Moving Archiving into Documents 151
Summary 152
Index 153

About the Author and About the Technical Reviewer

About the Author

Jesse Feiler

is a developer, consultant, and author specializing in database technologies and location-based apps. Jesse’s apps include NP Risk, Minutes Machine, Utility Smart, Cyber Continuity, and Saranac River Trail. He has worked for organizations as varied as the Federal Reserve Bank of New York (Chief, Special Projects Staff in Systems Development), the Albers and Archipenko foundations (data management), and a number of database projects typically using FileMaker. His apps are available in the App Store and are published by Champlain Arts Corp ( champlainarts.com ). Jesse is heard regularly on WAMC Public Radio for the Northeast’s The Roundtable. He is a founder of Friends of Saranac River Trail, Inc. A native of Washington DC, he has lived in New York City and currently lives in Plattsburgh, NY.

 

About the Technical Reviewer

Charles Cruz

is a mobile application developer for the iOS, Windows Phone, and Android platforms. He graduated from Stanford University with B.S. and M.S. degrees in engineering. He lives in Southern California and runs a photography business with his wife ( www.bellalentestudios.com ) and enjoys backpacking. Charles can be reached at [email protected] .

 
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