6、UIStepper基于swift的步进控件的使用

1、添加一个步进控件，一个减号和加号的控件，当点击加减号时，在标签上显示相应的值，如下代码所示：

//

// ViewController.swift

// Stepper

//

// Created by sunxj on 15/12/5.

// Copyright © 2015年 sunxj. All rights reserved.

//

import UIKit

class ViewController:
UIViewController {

var stepper:UIStepper?

var label:UILabel?

override func viewDidLoad() {

super.viewDidLoad()

// Do any additional setup after loading the view, typically from a nib.

label=UILabel(frame:CGRectMake(10,60,200,30))

stepper=UIStepper(frame:CGRectMake(10,100,60,60))

stepper?.minimumValue=0//设置步进的最小值

stepper?.maximumValue=100//设置步进的最大值

stepper?.value=20//设置步进的默认值

stepper?.continuous=true//是否当值改变时触发事件

stepper?.stepValue=1//当步进一次，值增加1

stepper?.addTarget(self, action:"stepChange",forControlEvents:UIControlEvents.ValueChanged)

label?.text="20"

self.view.addSubview(label!)

self.view.addSubview(stepper!)

}

func stepChange(){

label?.text=String(stepper?.value)

}

override func didReceiveMemoryWarning() {

super.didReceiveMemoryWarning()

// Dispose of any resources that can be recreated.

}

}
如下运行效果为：