如何在swift 3中从特定行显示选取器视图？

import UIKit

class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
    
    let pickerView = UIPickerView()
    let data = ["Option 1", "Option 2", "Option 3", "Option 4"]
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        pickerView.delegate = self
        pickerView.dataSource = self
        
        // 设置选取器视图的位置和大小
        pickerView.frame = CGRect(x: 0, y: 0, width: view.frame.width, height: 200)
        
        // 将选取器视图添加到视图控制器的视图中
        view.addSubview(pickerView)
        
        // 从特定行显示选取器视图
        let specificRow = 2
        pickerView.selectRow(specificRow, inComponent: 0, animated: false)
    }
    
    // 实现UIPickerViewDataSource协议方法，指定选取器视图的列数
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }
    
    // 实现UIPickerViewDataSource协议方法，指定选取器视图的行数
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return data.count
    }
    
    // 实现UIPickerViewDelegate协议方法，设置选取器视图的每行标题
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return data[row]
    }
}