The below Swift code example demonstrates how to create a UIStepper programmatically.
If you are interested in video lessons on how to write Unit tests and UI tests to test your Swift mobile app, check out this page: Unit Testing Swift Mobile App
If we break it down into smaller parts the code example below also demonstrates:
- How to add UIStepper as a Subview,
- Add custom function which gets triggered when UIStepper value is changed,
- Position UIStepper in the center of UIView,
- Make UIStepper value continuously increment when user taps and holds UIStepper button,
- Make UIStepper resume from the beginning when the maximum value is reached.
import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. let myUIStepper = UIStepper (frame:CGRect(x: 10, y: 150, width: 0, height: 0)) // Resume UIStepper value from the beginning myUIStepper.wraps = true // Position UIStepper in the center of the view myUIStepper.center = self.view.center // If tap and hold the button, UIStepper value will continuously increment myUIStepper.autorepeat = true // Set UIStepper max value to 10 myUIStepper.maximumValue = 10 // Add a function handler to be called when UIStepper value changes myUIStepper.addTarget(self, action: #selector(self.stepperValueChanged(_:)), for: .valueChanged) self.view.addSubview(myUIStepper) } @objc func stepperValueChanged(_ sender:UIStepper!) { print("UIStepper is now \(Int(sender.value))") } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } }
For more Swift code examples and tutorials, please check the Swift Code Examples page on this website.