How to resize Image with SwiftUI?

How about this:

struct ResizedImage: View {
    var body: some View {
        Image("myImage")
            .resizable()
            .scaledToFit()
            .frame(width: 200, height: 200)
    }
}

The image view is 200x200, but the image maintains the original aspect ratio (rescaling within that frame).

You should use .resizable() before applying any size modifications on an Image.

Image(room.thumbnailImage)
    .resizable()
    .frame(width: 32.0, height: 32.0)