swift 4 多个选择器视图不工作。我有三个数组，但只显示 "strBlood"

Question

swift 4 多个选择器视图不工作。我有三个数组，但只有 "strBlood" 显示了准确的数组，其他 strcountry 和 strgender 没有显示在选择器视图中，当我点击第三个标签时代码崩溃，给我信号 sigbart[=21 的错误=]

多个选择器视图在选择器视图中不显示数据 swift 4，我已经看了很多教程，但没有人解决我的问题，请检查并回答我。
当我实现 3 个选择器视图时，数据仅显示第一个选择器视图，即 (strblood) 而不是其他数组

下面的代码工作正常，但在点击其他标签时在选择器视图中显示数组时出现一个错误 ("lblblood"."lblcountry")

import UIKit import Foundation class RegisterViewController: 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 RegisterViewController : UIPickerViewDelegate , UIPickerViewDataSource { func numberOfComponents(in pickerView: UIPickerView) -> Int { return 1 } func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int { if lblBloodGroup.isEnabled { print("BLOOD SELECTED") return strBlood.count } else if txtCountry.isEnabled{ 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.isEnabled{ print("BLOOD SELECTED1") return strBlood[row] }else if txtCountry.isEnabled{ return strcountry[row] }else { return strgender[row] } } func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) { if lblBloodGroup.isEnabled{ selectedBlood = strBlood[row] lblBloodGroup.text = selectedBlood }else if txtCountry.isEnabled{ selectedCountry = strcountry[row] txtCountry.text = selectedCountry }else { selectedGender = strgender[row] txtGender.text = selectedGender } } }

Answer 1

实现这个isEnabled也于事无补。您需要使用 isEditing 并且如果用户单击任何 UITextField 并且您的代码将是：

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
        }
    }
}

结果将是：

swift 4 多个选择器视图不工作。我有三个数组，但只显示 "strBlood"

swift 4 multiple picker view not working. I have three arrays ,but only "strBlood" is showing

ios

swift

uipickerview