17.5 Preview Pinning
When building an app in Xcode it is likely that it will consist of several SwiftUI View files in addition to the default ContentView.swift file. When a SwiftUI View file is selected from the project navigator, both the code editor and preview canvas will change to reflect the currently selected file. Sometimes you may want the user interface layout for one SwiftUI file to appear in the preview canvas while editing the code in a different file. This can be particularly useful if the layout from one file is dependent on or embedded in another view. The pin button (labeled C in Figure 17-8 above) pins the current preview to the canvas so that it remains visible on the canvas after navigating to a different view. The view to which you have navigated will appear beneath the pinned view in the canvas and can be scrolled into view.
