Next, we are going to look at observable objects, and by observable we mean models that can change state or be updated due to an external API call. For example, a model that houses weather information from a weather API might get updated periodically. We would want our UI (or SwiftUI, in our case) to monitor this model for any changes and implement updates accordingly.
To dig a little deeper into how MVVM works with SwiftUI, let's write a small application that takes some data from an external API, parses the data, and then displays the data within our app.
ObservableObject is a protocol that is part of the new Combine framework, which was announced alongside SwiftUI at WWDC 19. Combine is Swift's own version of Reactive ...
