How to use UIStepper to let users change number values
Swift version: 5.0
UIStepper is one of those controls that doesn’t get used often, which is a shame – it’s trivial to add, and helps users select a value more accurately than a UISlider.
Here’s some code to help you try it out:
let stepper = UIStepper()
stepper.minimumValue = 0
stepper.maximumValue = 10
stepper.value = 5That tells iOS to let the stepper move from 0 to 10 (inclusive), starting at 0. By default the autorepeat property of steppers is set to true, which means the user can press and hold to increment values rather than tapping repeatedly.
Next, add some code to position your stepper where you want it. This places it at the top of the safe area, aligned to the center:
stepper.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(stepper)
stepper.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
stepper.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = trueFinally, connect an @objc method to the valueChanged event like this:
stepper.addTarget(self, action: #selector(stepperChanged), for: .valueChanged)LEARN SWIFTUI FOR FREE I wrote a massive, free SwiftUI tutorial collection, and also have a growing list of free SwiftUI tutorials on YouTube – get started today!
Available from iOS 5.0
Did this solution work for you? Please pass it on!
Other people are reading…
- How to give UITableViewCells a selected color other than gray
- How to adjust a UIScrollView to fit the keyboard
- How to fix Auto Layout problems
- How to add drag and drop to your app
- How to set the tabs in a UITabBarController
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
