如何在iOS 13中将UISegmentedControl的backgroundColor设置为白色

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        
        let segmentedControl = UISegmentedControl(items: ["Option 1", "Option 2", "Option 3"])
        segmentedControl.frame = CGRect(x: 50, y: 100, width: 300, height: 30)
        
        // 设置背景颜色为白色
        segmentedControl.backgroundColor = .white
        
        // 设置选中段的背景颜色
        segmentedControl.selectedSegmentTintColor = .blue
        
        // 设置段的标题颜色
        segmentedControl.setTitleTextAttributes([NSAttributedString.Key.foregroundColor: UIColor.black], for: .normal)
        segmentedControl.setTitleTextAttributes([NSAttributedString.Key.foregroundColor: UIColor.white], for: .selected)
        
        view.addSubview(segmentedControl)
    }
}