Displaying hierarchical content in expanding lists

An expanding list helps display hierarchical content in expandable sections. This expanding ability can be achieved by creating a struct that holds some information and an optional array of items. Let's examine how expanding lists work by creating an app that displays the contents of a backpack.

Getting ready

Create a new SwiftUI project named ExpandingLists.

How to do it…

We'll start by creating a Backpack struct that describes the properties of the data we want to display. The backpack will conform to the Identifiable protocol, and each backpack will have a name, an icon, an id, and some content of the Backpack type.A struct that represents a backpack is good for demonstrating hierarchies because, in real life, you can put a backpack in another backpack. The steps for this recipe are as follows:

1. At the top of our ContentView.swift file, before the ContentView struct, define the Backpack struct:

struct Backpack...