April 2020
Intermediate to advanced
528 pages
15h 40m
English
Content preview from iOS Programming: The Big Nerd Ranch Guide, 7th Edition
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Creating and Using Keys
When an image is added to the store, it will be put into the cache under a unique key, and the associated Item object will be given that key. When the DetailViewController wants an image from the store, it will ask its item for the key and search the cache for the image.
Add a property to Item.swift to store the key.
Listing 15.15 Adding a new property for a unique identifier (Item.swift)
let dateCreated: Date let itemKey: String
The image keys need to be unique for your cache to work. While there are many ways to hack together a unique string, you are going to use the Cocoa Touch mechanism for creating universally unique identifiers (UUIDs), also known as globally unique identifiers (GUIDs). ...
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