转载请声明出处：http://blog.csdn.net/jinnchang/article/details/44487407

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1、Summary

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2、Code

//
//  ViewController.swift
//  UISliderSample
//
//  Created by jinnchang on 15/3/19.
//  Copyright (c) 2015年 Jinn Chang. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    var mySlider: UISlider?

    override func viewDidLoad() {

        // 定义一个按钮，使 slider 复位
        let button1 = UIButton.buttonWithType(.System) as? UIButton
        button1?.frame = CGRectMake(self.view.frame.width/2 - 100, 50, 200, 50)
        button1?.setTitle("reset", forState: UIControlState.Normal)
        button1?.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)
        button1?.tag = 1

        // 定义一个按钮，获取当前 slider 的值
        let button2 = UIButton.buttonWithType(.System) as? UIButton
        button2?.frame = CGRectMake(self.view.frame.width/2 - 100, 150, 200, 50)
        button2?.setTitle("get value", forState: UIControlState.Normal)
        button2?.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)
        button2?.tag = 2

        // 定义一个 slider
        mySlider = UISlider(frame:CGRectMake(self.view.frame.width/2 - 100, 400, 200, 100))
        // 设置滑块所能滚动到的最小值
        mySlider?.minimumValue = 0
        // 设置滑块所能滚动到的最大值
        mySlider?.maximumValue = 100
        // 设置默认值
        mySlider?.value = 20
        // 设置是否连续触发事件，如果设为 false，在滑动过程中不触发，如果设为 true，在滑动过程中会连续触发
        mySlider?.continuous = true
        // 设置滑块左轨的图片
        mySlider?.setMinimumTrackImage(UIImage(named: "track.png"), forState: UIControlState.Normal)
        // 设置滑块右轨的图片
        mySlider?.setMaximumTrackImage(UIImage(named: "track.png"), forState: UIControlState.Normal)
        // 设置滑块的图片
        mySlider?.setThumbImage(UIImage(named: "thumb.png"), forState: UIControlState.Normal)
        // 注意这里要加UIControlStateHightlighted的状态，否则当拖动滑块时滑块将变成原生的控件
        mySlider?.setThumbImage(UIImage(named: "thumb.png"), forState: UIControlState.Highlighted)
        // 设置 slider 左侧图片
        mySlider?.minimumValueImage = UIImage(named: "min.png")
        // 设置 slider 右侧图片
        mySlider?.maximumValueImage = UIImage(named: "min.png")
        // 添加控制事件
        mySlider?.addTarget(self,action:Selector("sliderValueChange:"), forControlEvents: UIControlEvents.ValueChanged)
        mySlider?.addTarget(self,action:Selector("sliderDragUp:"), forControlEvents: UIControlEvents.TouchUpInside)

        self.view.addSubview(button1!)
        self.view.addSubview(button2!)
        self.view.addSubview(mySlider!)
    }

    /// 按钮响应事件
    func buttonAction(sender: UIButton) {
        var num = sender.tag
        switch num {
        case 1:
            if(mySlider?.value != 20){
                mySlider?.setValue(20, animated: true)
            }
        case 2:
            println("value:\(mySlider!.value)")
        default:
            break
        }
    }

    /// 滑块拖动时的事件
    func sliderValueChange(sender: UISlider) {
        println("value:\(sender.value)")
    }

    /// 滑块拖动后的事件
    func sliderDragUp(sender: UISlider) {
        println("value:\(sender.value)")
    }

}

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3、Resource

Github 上项目地址：UISliderSample

文章最后更新时间：2015年3月20日09:54:24。参考资料如下：

UIKit User
Interface Catalog: Sliders

UISlider Class Reference