Preview(_:as:using:widget:contentStates:)

Declaration

@freestanding(declaration) macro Preview<Widget, Attributes>(_ name: String? = nil, as viewKind: ActivityPreviewViewKind, using attributes: Attributes, widget: @escaping () -> Widget, @PreviewActivityBuilder<Attributes> contentStates: @escaping @MainActor () async -> [Attributes.ContentState]) where Widget : Widget, Attributes : ActivityAttributes

Parameters

• name:

  An optional display name for the preview that appears in the preview canvas.

• viewKind:

  The kind of widget view to display.

• attributes:

  The attributes with which to configure the widget.

• widget:

  A closure producing the widget to be previewed.

• contentStates:

  A closure building the content states to be previewed.

Mentioned in

• Previewing widgets and Live Activities in Xcode

Overview

Provide the preview with sample data and use it to step through the specified content states and test out the transitions between them.