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How to create a slider and read values from it

Paul Hudson    @twostraws   

Updated for Xcode 13.0

SwiftUI’s Slider view works much like UISlider, although you need to bind it somewhere so you can store its value.

When you create it there are a variety of parameters you can provide, but the ones you probably care about most are:

  • Value: What Double to bind it to.
  • In: The range of the slider.
  • Step: How much to change the value when you move the slider. This parameter is optional.

For example, this code creates a slider bound to a Celsius property, then updates a text view as the slider moves so that it converts between Celsius and Fahrenheit:

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")
        }
    }
}

Download this as an Xcode project

A slider with a blue-grey bar and white handle. Below is the text “0.0 Celsius is 32.0 Fahrenheit”.

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