如何在UIPickerView的每个组件上设置标题？

class MyPickerViewDelegate: NSObject, UIPickerViewDelegate {
    let component1Data = ["Option 1", "Option 2", "Option 3"]
    let component2Data = ["Choice A", "Choice B", "Choice C"]
    
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 2 // 设置UIPickerView的组件数为2
    }
    
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        if component == 0 {
            return component1Data.count // 第一个组件的行数为component1Data的元素个数
        } else {
            return component2Data.count // 第二个组件的行数为component2Data的元素个数
        }
    }
    
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        if component == 0 {
            return component1Data[row] // 返回第一个组件对应行索引的标题
        } else {
            return component2Data[row] // 返回第二个组件对应行索引的标题
        }
    }
}

// 在需要使用UIPickerView的地方
let pickerView = UIPickerView()
let pickerViewDelegate = MyPickerViewDelegate()
pickerView.delegate = pickerViewDelegate