如何创建滑块 Slider 并从中读取值？

struct ContentView: View {
    @State private var celsius: Double = 0

    var body: some View {
        VStack {
            Slider(value: $celsius, in: -100...100)
            Text("\(celsius, specifier: "%.1f") Celsius is \(celsius * 9 / 5 + 32, specifier: "%.1f") Fahrenheit")
        }
    }
}