如何在iOS中实现矩形顺时针进度？

import UIKit

class ProgressView: UIView {
    var progress: CGFloat = 0.0
    
    override func draw(_ rect: CGRect) {
        super.draw(rect)
        
        // 绘制背景
        let backgroundRect = CGRect(x: 0, y: 0, width: rect.width, height: rect.height)
        UIColor.lightGray.setFill()
        UIRectFill(backgroundRect)
        
        // 绘制前景
        let foregroundRect = CGRect(x: 0, y: 0, width: rect.width * progress, height: rect.height)
        UIColor.blue.setFill()
        UIRectFill(foregroundRect)
    }
}

import UIKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let progressView = ProgressView()
        progressView.frame = CGRect(x: 50, y: 100, width: 200, height: 20)
        progressView.progress = 0.5
        
        view.addSubview(progressView)
    }
}