如何以RxSwift的方式实现shouldChangeTextIn

import UIKit
import RxSwift
import RxCocoa

class ViewController: UIViewController {
    
    let disposeBag = DisposeBag()
    let textField = UITextField()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        setupTextField()
        bindTextField()
    }
    
    private func setupTextField() {
        textField.borderStyle = .roundedRect
        textField.placeholder = "请输入文本"
        textField.translatesAutoresizingMaskIntoConstraints = false
        
        view.addSubview(textField)
        
        // 设置约束
        NSLayoutConstraint.activate([
            textField.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            textField.centerYAnchor.constraint(equalTo: view.centerYAnchor),
            textField.widthAnchor.constraint(equalToConstant: 200)
        ])
    }
    
    private func bindTextField() {
        // 监听文本变化
        textField.rx.text.orEmpty
            .subscribe(onNext: { [weak self] text in
                // 在这里处理文本变化
                print("当前文本: \(text)")
                
                // 例如，限制文本长度
                if text.count > 10 {
                    self?.textField.text = String(text.prefix(10))
                }
            })
            .disposed(by: disposeBag)
        
        // 监听文本字段的编辑事件
        textField.rx.controlEvent(.editingChanged)
            .subscribe(onNext: { [weak self] in
                guard let text = self?.textField.text else { return }
                // 在这里可以进行更多的处理
                print("编辑中: \(text)")
            })
            .disposed(by: disposeBag)
    }
}