PreviewLayout

enum · iOS 13.0+ · SDK 27.1

enum PreviewLayout

A size constraint for a preview. Customize the layout of a preview that you define using the <doc://com.apple.documentation/documentation/SwiftUI/PreviewProvider> protocol by providing one of the preview layout values to the <doc://com.apple.documentation/documentation/SwiftUI/View/previewLayout(_:)> view modifier. For example, you can tell the preview to take up only the amount of space that the view requires with ``sizeThatFits``: struct CircleImage_Previews: PreviewProvider { static var previews: some View { CircleImage() .previewLayout(.sizeThatFits) } } > Note: When you migrate away from preview providers and to preview macros, you specify layout using one of the ``PreviewTrait`` layout values with a macro that takes traits, like <doc://com.apple.documentation/documentation/SwiftUI/Preview(_:traits:_:body:)>.

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