SwiftUI—如何将颜色、图片和图形作为视图的背景

struct ContentView : View {
    var body: some View {
        VStack{
            Spacer()
            Text("SwiftUI Tutorials")
                .font(.largeTitle)
                .padding()
                .background(Color.orange)
            Spacer()
            Text("SwiftUI Tutorials")
            .font(.largeTitle)
            .padding()
            .background(Image("iPhoneSerial")
                .resizable())
            Spacer()
            Text("SwiftUI Tutorials")
                .font(.largeTitle)
                .padding()
                .background(Circle()
                    .fill(Color.orange)
                    .frame(width: 280, height: 280))
            Spacer()
        }
    }
}