如何在一个视图控制器中使用多个UIPickerViews

import UIKit

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
    
    let pickerView1 = UIPickerView()
    let pickerView2 = UIPickerView()
    
    let data1 = ["Option 1", "Option 2", "Option 3"]
    let data2 = ["Choice A", "Choice B", "Choice C"]
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        pickerView1.dataSource = self
        pickerView1.delegate = self
        view.addSubview(pickerView1)
        
        pickerView2.dataSource = self
        pickerView2.delegate = self
        view.addSubview(pickerView2)
        
        // 设置选择器的位置和大小
        pickerView1.frame = CGRect(x: 0, y: 100, width: view.frame.width, height: 200)
        pickerView2.frame = CGRect(x: 0, y: 400, width: view.frame.width, height: 200)
    }
    
    // MARK: - UIPickerViewDataSource
    
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1 // 每个选择器只有一列
    }
    
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        if pickerView == pickerView1 {
            return data1.count
        } else if pickerView == pickerView2 {
            return data2.count
        }
        return 0
    }
    
    // MARK: - UIPickerViewDelegate
    
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        if pickerView == pickerView1 {
            return data1[row]
        } else if pickerView == pickerView2 {
            return data2[row]
        }
        return nil
    }
    
    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        if pickerView == pickerView1 {
            let selectedOption = data1[row]
            print("Selected option: \(selectedOption)")
        } else if pickerView == pickerView2 {
            let selectedChoice = data2[row]
            print("Selected choice: \(selectedChoice)")
        }
    }
}