var step : UIStepper!
var label : UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
step = UIStepper(frame: CGRect(x: 100, y: 100, width: 200, height: 50))
//设置stepper的范围与初始值
step.maximumValue=10
step.minimumValue=1
step.value=5.5
//设置每次增减的值
step.stepValue=0.5
//设置stepper可以按住不放来连续更改值
step.isContinuous=true
//设置stepper是否循环（到最大值时再增加数值从最小值开始）
step.wraps=true
step.addTarget(self, action:#selector(stepClick), for: .valueChanged)
self.view.addSubview(step)
}
func stepClick()
{
print("\(step.value)")
}
