如何在iOS 13中创建带有麦克风图标的搜索栏？

import UIKit

class ViewController: UIViewController, UISearchBarDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建UISearchBar
        let searchBar = UISearchBar(frame: CGRect(x: 20, y: 100, width: view.bounds.width - 40, height: 44))
        searchBar.delegate = self
        view.addSubview(searchBar)
        
        // 自定义TextField
        if let textField = searchBar.value(forKey: "searchField") as? UITextField {
            textField.borderStyle = .none
            textField.backgroundColor = .white
            
            // 添加麦克风图标
            let microphoneIcon = UIImageView(image: UIImage(named: "microphone"))
            microphoneIcon.frame = CGRect(x: 8, y: 8, width: 24, height: 24)
            microphoneIcon.contentMode = .scaleAspectFit
            textField.leftView = microphoneIcon
            textField.leftViewMode = .always
        }
    }
    
    // UISearchBarDelegate方法
    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
        print("Search text changed: \(searchText)")
    }
}