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How to create a slider and read values from it

Paul Hudson    @twostraws   

Updated for Xcode 14.0 beta 1

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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