import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {

        super.viewDidLoad()

        let progressView = UIProgressView(progressViewStyle: .default)

        progressView.center = self.view.center

        progressView.progress = 0.5 // 默认 50%

        self.view.addSubview(progressView)

        progressView.progressTintColor = UIColor.green // 已有进度颜色

        progressView.trackTintColor = UIColor.blue  // 剩余进度颜色

        progressView.setProgress(0.8, animated: true)

    }

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }

}