How to preview SwiftUI Layout without device frame

When you create a new SwiftUI view, it will come with a preview code like this.

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

This PreviewProvider lets you debug your view in the Xcode without running your app.

To open the preview.

1. Select Editor Menu > Canvas.
2. Or ⌥ – option + ⌘ - command + ⏎ Return.

The preview editor will show up side by side with your code editor.

By default, you will see your view render in a selected device.

But if you want to preview your view independent of the device context, you can also do that.

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How to preview SwiftUI layout Without Device frame

To preview a SwiftUI layout without a device frame, you need to add .previewLayout(.sizeThatFits) to your preview content.

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
            .previewLayout(.sizeThatFits)
    }
}

With this one line of code, you can preview your view without a device frame.