您在委托方法中引用了UIPickerView，因此可以执行以下代码：

You have a reference to your UIPickerView in the delegate methods so you can do code like :

func numberOfComponents(in pickerView: UIPickerView) -> Int {
    if(pickerView == pl) {
      //pl specific code
    }
    if(pickerView == pl2) {
       //pl2 specific code
    }
}

然后针对每种方法执行该操作。

And do that for every method.