UIStepperを使って値を増減させる
UIStepperを使って値を増減させる方法です。 UIStepperを使うと値を増減させるUIを簡単に実装することができます。
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| import UIKit | |
| class ViewController: UIViewController { | |
| private lazy var label = UILabel() | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| view.backgroundColor = .white | |
| label.textAlignment = .center | |
| label.text = "5.0" | |
| label.sizeToFit() | |
| label.center = CGPoint(x: view.bounds.size.width / 2, y: view.bounds.height / 2 - 50) | |
| view.addSubview(label) | |
| let stepper = UIStepper() | |
| stepper.addTarget(self, action: #selector(stepperDidTap(stepper:)), for: .touchUpInside) | |
| stepper.value = 5 | |
| stepper.minimumValue = 3 | |
| stepper.maximumValue = 8 | |
| stepper.center = view.center | |
| view.addSubview(stepper) | |
| } | |
| @objc func stepperDidTap(stepper: UIStepper) { | |
| label.text = "\(stepper.value)" | |
| label.sizeToFit() | |
| label.center = CGPoint(x: view.bounds.size.width / 2, y: view.bounds.height / 2 - 50) | |
| } | |
| } |