1、创建进度条

progressView.frame = CGRect(x:10, y:230, width:self.view.bounds.size.width - 20, height:150)
  progressView.progressViewStyle = .default
  progressView.center = self.view.cente
  progressView.progress = 0.5 //默认进度50%
  self.view.addSubview(progressView)

2、设置进度，同时又动画效果

progressView.setProgress(0.8, animated: true)

3、改变进度条的颜色

progressView.progressTintColor = UIColor.red
progressView.trackTintColor = UIColor.green