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Learning Xcode 8

You're reading from   Learning Xcode 8 Learn to build iOS Applications with Xcode 8

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Product type Paperback
Published in Nov 2016
Publisher Packt
ISBN-13 9781785885723
Length 480 pages
Edition 1st Edition
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Author (1):
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Jak Tiano Jak Tiano
Author Profile Icon Jak Tiano
Jak Tiano
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Toc

Table of Contents (18) Chapters Close

Preface 1. Starting Your iOS Journey FREE CHAPTER 2. Welcome to Xcode 3. Introduction to Swift 3 4. Using Storyboards, Auto Layout, and Size Classes 5. Taking Advantage of Source Control in Xcode 6. Building Your First iOS App 7. Integrating Multitouch and Gestures 8. Exploring Common iOS Frameworks 9. Working with Core Data 10. Creating a watchOS Companion App 11. Advanced Input Using Sensors 12. Sending Notifications 13. Writing Unit Tests 14. Debugging an iOS Application 15. Optimizing Your App 16. Distributing an iOS App Index

Persisting data


In order to implement persistence for our application's data, we need to do three things: save data, load data, and delete data. In this section, we're going to go through our ViewController class and remove all of the references to our old data model, and instead begin using our new Core Data compatible data model. As we go, we'll be introducing new ways of saving and loading our snippet data, and adding the ability to delete snippets.

Saving data

With our old data model, saving data consisted of two steps: create a new instance of a SnippetData subclass, and then add it to our data array. Now, with Core Data, the process is pretty similar but it takes a few more lines of code and uses some new concepts.

Before we can get started with our new save mechanisms, we're going to make two small changes. First, add an import CoreData command at the top of the ViewController.swift file, with the other import statements. Then, change the type of our data array so that instead of [SnippetData...

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