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Mastering Xcode Previews
Xcode 11 displays previews of your user interface right in the editor,
streamlining the edit-debug-run cycle into a seamless workflow. Learn
how previews work, how to optimize the structure of your SwiftUI app
for previews, and how to add preview support to your existing views
and view controllers.
WWDC 2019 - Session 233 - iOS, macOS, tvOS, watchOS