# init(_:value:in:step:format:onEditingChanged:) Creates a stepper instance that increments and decrements a binding to a value, by a step size and within a closed range that you provide, displaying its value with an applied format style. ``` @export(implementation) nonisolated init(_ titleResource: LocalizedStringResource, value: Binding, in bounds: ClosedRange, step: F.FormatInput.Stride = 1, format: F, onEditingChanged: @escaping (Bool) -> Void = { _ in }) where F : ParseableFormatStyle, F.FormatInput : BinaryFloatingPoint, F.FormatOutput == String ``` ## Parameters `titleResource` Text resource for the stepper’s localized title describing the purpose of the stepper. `value` A [`Binding`](/documentation/SwiftUI/Binding) to a value that your provide. `bounds` A closed range that describes the upper and lower bounds permitted by the stepper. `step` The amount to increment or decrement `value` each time the user clicks or taps the stepper’s increment or decrement button, respectively. Defaults to `1`. `format` A format style of type `F` to use when converting between the string the user edits and the underlying value of type `F.FormatInput`. If `format` can’t perform the conversion, the stepper leaves `value` unchanged. If the user stops editing the text in an invalid state, the stepper updates the text to the last known valid value. `onEditingChanged` A closure that’s called when editing begins and ends. For example, on iOS, the user may touch and hold the increment or decrement buttons on a `Stepper` which causes the execution of the `onEditingChanged` closure at the start and end of the gesture. ## Discussion Use `Stepper(_:value:in:step:format:onEditingChanged:)` to create a stepper that increments or decrements a value within a specific range of values by a specific step size, while displaying the current value. In the example below, a stepper increments or decrements a binding to value over a range of `1...50` by `5` each time the user clicks or taps the stepper’s increment or decrement buttons: ``` struct StepperView: View { @State private var value = 0.0 private let step = 5.0 private let range = 1.0...50.0 var body: some View { Stepper("Stepping by \(step) in \(range.description)", value: $value, in: range, step: step, format: .number ) .padding() } } ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)