一定間隔の値をUISlider で取得する(Swift5.0)
0, 0.5, 1.0, 1.5 …. と一定間隔の値をUISlider で取得するサンプルコードです。
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| import UIKit | |
| class UISliderRoundValue_20190523: UIViewController { | |
| var sliderValue: UILabel! | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| view.backgroundColor = .white | |
| let initialValue: Float = 8.0 | |
| let width = view.frame.width | |
| let height = view.frame.height | |
| let slider = UISlider() | |
| slider.minimumValue = 0.0 | |
| slider.maximumValue = 10.0 | |
| slider.value = initialValue | |
| slider.tintColor = .orange | |
| slider.frame = CGRect(x: width * 0.1, y: height * 0.2, width: width * 0.8, height: height * 0.1) | |
| slider.addTarget(self, action: #selector(sliderDidChangeValue(_:)), for: .valueChanged) | |
| view.addSubview(slider) | |
| sliderValue = UILabel() | |
| sliderValue.frame = CGRect(x: width * 0.1, y: height * 0.4, width: width * 0.8, height: height * 0.1) | |
| sliderValue.textAlignment = .center | |
| sliderValue.text = String(initialValue) | |
| view.addSubview(sliderValue) | |
| } | |
| @objc func sliderDidChangeValue(_ sender: UISlider) { | |
| let roundValue = roundf(sender.value * 2.0) * 0.5 | |
| // set round value | |
| sender.value = roundValue | |
| sliderValue.text = String(roundValue) | |
| } | |
| } | |