Use a declarative approach to build UIs for iOS and macOS. Start with a review of what declarative programming is by building with SwiftUI. We will review all the basic SwiftUI components needed for a modern iOS app. Once we have a solid understanding of SwiftUI, we will cover reactive programming with the Combine framework. Understanding these components will allow us to incorporate SwiftUI with the Combine framework and make a fully declarative/reactive (MVVM) application.