How to resize Image with SwiftUI?

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

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

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).

Expanding on @rraphael's answer and comments:

As of Xcode 11 beta 2, you can scale an image to arbitrary dimensions, while maintaining the original aspect ratio by wrapping the image in another element.

e.g.

struct FittedImage: View{    let imageName: String    let width: CGFloat    let height: CGFloat    var body: some View {        VStack {            Image(systemName: imageName)                .resizable()                .aspectRatio(1, contentMode: .fit)        }        .frame(width: width, height: height)    }}struct FittedImagesView: View{    private let _name = "checkmark"    var body: some View {        VStack {            FittedImage(imageName: _name, width: 50, height: 50)            .background(Color.yellow)            FittedImage(imageName: _name, width: 100, height: 50)            .background(Color.yellow)            FittedImage(imageName: _name, width: 50, height: 100)            .background(Color.yellow)            FittedImage(imageName: _name, width: 100, height: 100)            .background(Color.yellow)        }    }}

Results

(For some reason, the image is showing as a bit blurry. Rest assured that the real output is sharp.)