如何添加UIPickerView区段？

let pickerView = UIPickerView()
pickerView.frame = CGRect(x: 0, y: 0, width: view.frame.width, height: 200)
pickerView.delegate = self

extension ViewController: UIPickerViewDelegate, UIPickerViewDataSource {
    // 返回选择器的区段数
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }
    
    // 返回每个区段的行数
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return data.count
    }
    
    // 返回每行的标题
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return data[row]
    }
    
    // 选中某一行时的回调
    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        // 处理选中行的逻辑
    }
}

view.addSubview(pickerView)