如何在进度条UIView中添加动画

import UIKit

class ViewController: UIViewController {
    var progressView: UIProgressView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建进度条视图
        progressView = UIProgressView(progressViewStyle: .default)
        progressView.frame = CGRect(x: 50, y: 100, width: 200, height: 20)
        view.addSubview(progressView)
        
        // 创建动画
        let animation = CABasicAnimation(keyPath: "progress")
        animation.fromValue = 0.0
        animation.toValue = 1.0
        animation.duration = 2.0
        
        // 将动画添加到进度条视图的layer上
        progressView.layer.add(animation, forKey: "progressAnimation")
    }
}