Helpers to enable landscape, light and dark modes in preview.

.enable_landscape_light_and_dark_previews.md

Enable landscape in preview

Helper struct to enable landscape in preview.

Landscape {
    ContentView()
        .previewDevice("iPhone Xʀ")
        .landscape()
}

Eanble light and dark modes in preview

Helper struct to enable both light and dark modes in preview.

LightAndDark {
    ContentView()
        .previewDevice("iPhone Xʀ")
}

Preview+Utils.swift

#if DEBUG

struct LandscapeModifier: ViewModifier {
    let height = UIScreen.main.bounds.width
    let width = UIScreen.main.bounds.height

    func body(content: Content) -> some View {
        content
            .previewLayout(.fixed(width: width, height: height))
            .environment(\.horizontalSizeClass, .compact)
            .environment(\.verticalSizeClass, .compact)
    }
}

extension View {

    func landscape() -> some View {
        modifier(LandscapeModifier())
    }
}

struct LightAndDark<Content>: View where Content: View {
    let content: () -> Content
    var body: some View {
        ForEach(ColorScheme.allCases, id: \.self) { colorScheme in
            content()
                .environment(\.colorScheme, colorScheme)
                .previewDisplayName("\(colorScheme)")
        }
    }
}

#endif