如何防止uitextfield扩展它的宽度，但允许它的高度与文本？

class ViewController: UIViewController, UITextFieldDelegate {
    @IBOutlet weak var textField: UITextField!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        textField.delegate = self
    }
    
    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        // 计算文本内容的宽度
        let text = (textField.text as NSString?)?.replacingCharacters(in: range, with: string) ?? ""
        let textSize = text.size(withAttributes: [NSAttributedString.Key.font: textField.font ?? UIFont.systemFont(ofSize: 17)])
        
        // 设置UITextField的宽度为文本内容的宽度
        textField.frame.size.width = textSize.width
        
        return true
    }
}