如何使用Done按钮创建两个UIPickerView

import UIKit

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
    
    let pickerView1 = UIPickerView()
    let pickerView2 = UIPickerView()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        pickerView1.dataSource = self
        pickerView1.delegate = self
        pickerView2.dataSource = self
        pickerView2.delegate = self
        
        let toolbar = UIToolbar(frame: CGRect(x: 0, y: 0, width: view.frame.size.width, height: 44))
        let doneButton = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(doneButtonTapped))
        toolbar.setItems([doneButton], animated: true)
        
        let textField1 = UITextField(frame: CGRect(x: 0, y: 100, width: view.frame.size.width, height: 44))
        textField1.inputView = pickerView1
        textField1.inputAccessoryView = toolbar
        view.addSubview(textField1)
        
        let textField2 = UITextField(frame: CGRect(x: 0, y: 200, width: view.frame.size.width, height: 44))
        textField2.inputView = pickerView2
        textField2.inputAccessoryView = toolbar
        view.addSubview(textField2)
    }
    
    @objc func doneButtonTapped() {
        let selectedValue1 = pickerView1.selectedRow(inComponent: 0)
        let selectedValue2 = pickerView2.selectedRow(inComponent: 0)
        
        // 处理选中的数值
        print("PickerView 1: \(selectedValue1)")
        print("PickerView 2: \(selectedValue2)")
        
        // 其他处理逻辑...
        
        view.endEditing(true)
    }
    
    // UIPickerViewDataSource方法
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }
    
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        // 返回相应的行数
        return 10
    }
    
    // UIPickerViewDelegate方法
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        // 返回每行的标题
        return "Row \(row)"
    }
}