圈出Swift倒计时的进度条

import UIKit

class ViewController: UIViewController {
    var timer: Timer?
    var progressView: UIProgressView!

    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建进度条
        progressView = UIProgressView(progressViewStyle: .default)
        progressView.center = view.center
        progressView.setProgress(1.0, animated: false)
        view.addSubview(progressView)
        
        // 启动定时器
        startTimer()
    }

    func startTimer() {
        // 设置定时器
        timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(updateProgress), userInfo: nil, repeats: true)
    }

    @objc func updateProgress() {
        // 更新进度条
        if progressView.progress > 0 {
            progressView.setProgress(progressView.progress - 0.1, animated: true)
        } else {
            timer?.invalidate() // 停止定时器
        }
    }
}