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 UIKitclass 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.    }}