Creating a data model and using the ObservableObject protocol

Let’s create a new file – although this time, choose the Swift template file rather than the SwiftUI View template – and call it DataModel. In this file, we will put the data that we can access from ContentView later, using the @ObservableObject protocol.

To use this protocol, we first need to import the SwiftUI framework:

import SwiftUI

Next, we need a class to hold all the data, and we also need to make the class conform to the @ObservableObject protocol, so let’s add that now. You can name the class anything you want, but many developers like to name the class the same name as the file it is in, so we will do the same, naming the class DataModel:

class DataModel: ObservableObject {
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