18. SwiftUI Architecture
A completed SwiftUI app is constructed from multiple components which are assembled in a hierarchical manner. Before embarking on the creation of even the most basic of SwiftUI projects, it is useful to first gain an understanding of how SwiftUI apps are structured. With this goal in mind, this chapter will introduce the key elements of SwiftUI app architecture, with an emphasis on App, Scene and View elements.
18.1 SwiftUI App Hierarchy
When considering the structure of a SwiftUI application, it helps to view a typical hierarchy visually. Figure 18-1, for example, illustrates the hierarchy of a simple SwiftUI app:
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