PROSAGA码农传奇-swift/objective-C-swift 4多个选择器视图无法正常工作。我有三个数组，但只有“trBlood”显示

<div class =“post-text”itemprop =“text”>
  <P>
    为达到这个
     <code>
      isEnabled
    </code>
     没有用。你需要使用
     <code>
      isEditing
    </code>
     如果用户点击任何一个，那将是真的
     <code>
      UITextField
    </code>
     你的代码将是：
  </p>
   <pre>
    <code>
      import UIKit
import Foundation

class ViewController: UIViewController  {

var strBlood = ["O+","O-","O","A","B+"]
    var strcountry = ["India","Canada","USA"]
    var strgender = ["Male","Female"]

var selectedBlood: String?
    var selectedCountry: String?
    var selectedGender: String?

@IBOutlet weak var txtGender: UITextField!
    @IBOutlet weak var txtCountry: UITextField!
    @IBOutlet weak var lblBloodGroup: UITextField!

override func viewDidLoad() {
        super.viewDidLoad()
        self.chooseCountry()
        self.chooseBlood()
        self.choosGender()
    }

func chooseBlood(){
        let bloodPicker = UIPickerView()
        bloodPicker.delegate = self
        self.lblBloodGroup.inputView = bloodPicker
    }

func chooseCountry(){

let countryname = UIPickerView()
        countryname.delegate = self
        self.txtCountry.inputView = countryname
    }
    func choosGender() {

let gender1 = UIPickerView()
        gender1.delegate = self
        self.txtGender.inputView = gender1
    }
}
extension ViewController : UIPickerViewDelegate , UIPickerViewDataSource {

func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }

func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {

if lblBloodGroup.isEditing {
            print("BLOOD SELECTED")
            return strBlood.count

}
        else if txtCountry.isEditing{
            print("COUNTRY SELECTED")

return strcountry.count
        }else {
            print("GENDER SELECTED")
            return strgender.count
        }

}

func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {

if lblBloodGroup.isEditing{
            print("BLOOD SELECTED1")
            return strBlood[row]

}else if txtCountry.isEditing{

return strcountry[row]
        }else {
            return strgender[row]
        }

}

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)  {
        if lblBloodGroup.isEditing{
            selectedBlood = strBlood[row]
            lblBloodGroup.text = selectedBlood

}else if txtCountry.isEditing{
            selectedCountry = strcountry[row]
            txtCountry.text = selectedCountry
        }else {
            selectedGender = strgender[row]
            txtGender.text = selectedGender
        }
    }
}

</code>
  </pre>
  <P>
    结果将是：
  </p>
  <P>
    <a href="https://i.stack.imgur.com/zJytK.gif" rel="nofollow noreferrer">
      <img src =“https://i.stack.imgur.com/zJytK.gif”alt =“在此处输入图片说明”/>
    </A>
  </p>
</DIV>