Swift 进度条 UIProgressView

//  进度条 UIProgressView  顾名思义用来显示进度的，如音乐，视频的播放进度，和文件的上传下载进度等

import UIKit

class ViewController: UIViewController {

    var myProgressView:UIProgressView!
    var timer:NSTimer!
    var proValue:Double!


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        /**
         1,创建进度条
         */

        let progressView = UIProgressView(progressViewStyle:UIProgressViewStyle.Default)
        progressView.center = self.view.center
        // 设置进度条进度(0.0-1.0之间，默认为0.0)
        progressView.progress = 0.0
        self.view.addSubview(progressView);

        /**
         2,设置进度，同时有动画效果
         */
        progressView.setProgress(0.8, animated: true)

        /**
         3,改变进度条的颜色
         */
        //  设置已走过的进度条颜色
        progressView.progressTintColor = UIColor.greenColor()
        //  设置未走过进度的进度条颜色
        progressView.trackTintColor = UIColor.blueColor()

        /**
         4,使用计时器和按钮让进度条做动画
         */

        myProgressView = UIProgressView(frame:CGRectMake(100, 50, 150, 20))
        myProgressView.progressViewStyle = .Default
        self.view.addSubview(myProgressView);

        // 按钮
        let button = UIButton(type:.Custom)
        button.frame = CGRectMake(10, 20, 60, 60)
        button.setTitle("点我", forState: .Normal)
        button.backgroundColor = UIColor.blackColor()
        button.addTarget(self, action: #selector(buttonAction(_:)), forControlEvents: .TouchUpInside)
        self.view.addSubview(button)


    }

    // 按钮响应事件
    func buttonAction(sender:UIButton) {

        proValue = 0;
        //利用计时器，每隔1秒调用一次（changeProgress）
        timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: #selector(changeProgress), userInfo: nil, repeats: true)

    }
    // 计时器响应事件
    func changeProgress() {

        proValue = proValue + 1.0 // 改变ProValue的值

        if proValue > 5 {
            // 停止使用计时器
            print("停止使用计时器")
            timer.invalidate()
        } else {
            myProgressView.setProgress((Float)(proValue/5), animated: true) // 重置进度条
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}