iOS Programming: The Big Nerd Ranch Guide

Giving View Controllers Access to the Image Store

The DetailViewController needs an instance of ImageStore to fetch and store images. You will inject this dependency into the DetailViewController’s designated initializer, just as you did for ItemsViewController and ItemStore in Chapter 9.

In DetailViewController.swift, add a property for an ImageStore.

var item: Item! {
    didSet {
        navigationItem.title = item.name
    }
}
var imageStore: ImageStore!

Now do the same in ItemsViewController.swift.

let itemStore: ItemStore
var imageStore: ImageStore!

Next, still in ItemsViewController.swift, update prepareForSegue(_:sender:) to set the imageStore property on DetailViewController.

override func prepareForSegue(segue: UIStoryboardSegue, ...