import UIKit

class ViewController: UIViewController{
    var stepper:UIStepper!
    var label:UILabel!
    override func viewDidLoad() {
        super.viewDidLoad()
        //建立Stepper
        stepper = UIStepper(frame: CGRect(x: 150, y: 250, width: 100, height: 100))
        //設定最大值
        stepper.maximumValue = 10
        //設定最小值
        stepper.minimumValue = 0
        //設定初始值
        stepper.value = 1
        //設定遞增減值
        stepper.stepValue = 0.5
        //設定是否可以按住連續更改值
        stepper.isContinuous = true
        //設定stepper是否迴圈(超過最大值從最小值開始)
        stepper.wraps = true
        //設定stepper顏色
        stepper.tintColor = UIColor.red
        //設定+-符號，背景，中間分隔線圖片
        stepper.setDecrementImage(UIImage(named: "DecrementImage"), for: .normal)//設定-符號圖片
        stepper.setIncrementImage(UIImage(named: "IncrementImage"), for: .normal)//設定+符號圖片
        stepper.setBackgroundImage(UIImage(named:"BackImage"), for: .normal)
        stepper.setDividerImage(UIImage(named: "DividerImage"), forLeftSegmentState: .normal, rightSegmentState: .normal)//設定中間分割線圖片
        //新增響應事件
        stepper.addTarget(self, action: #selector(ViewController.stepperValueChanged), for: .valueChanged)
        self.view.addSubview(stepper)
        label = UILabel(frame: CGRect(x: 150, y: 300, width: 300, height: 50))
        label.text = "當前值為:\(stepper.value)"
        self.view.addSubview(label)
    }
    @objc func stepperValueChanged()
    {
        label.text = "當前值為：\(stepper.value)"
    }
}