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How to preview your layout in different devices

Paul Hudson    @twostraws   

Updated for Xcode 12.0

Xcode’s SwiftUI preview lets us show our designs in multiple screen sizes at the same time using the .previewDevice() modifier. This needs to be provided with the exact name of a device as seen in Xcode’s destination menu, e.g. “iPhone XS Max”.

For example, this shows a preview on the iPhone SE:

ContentView()
    .previewDevice(PreviewDevice(rawValue: "iPhone SE"))

When using specific devices for previewing, you’re likely to find it useful to add in the .previewDisplayName() modifier, which lets you put a name under a device in the preview window.

For example, this creates two previews for two different devices, adding the name of each to make it clear what’s going on:

#if DEBUG
struct ContentView_Previews: PreviewProvider {
   static var previews: some View {
      Group {
         ContentView()
            .previewDevice(PreviewDevice(rawValue: "iPhone SE"))
            .previewDisplayName("iPhone SE")

         ContentView()
            .previewDevice(PreviewDevice(rawValue: "iPhone XS Max"))
            .previewDisplayName("iPhone XS Max")
      }
   }
}
#endif
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