Flexbox Swift Item
data class FlexboxSwiftItem(val style: FlexItemStyle, val preferredWidth: Float, val preferredHeight: Float)(source)
Describes a flex item for use from Swift when implementing SwiftUI's Layout protocol.
The preferredWidth and preferredHeight should be obtained from SwiftUI's subview.sizeThatFits(.unspecified) inside a Layout.placeSubviews call.