2 个 TextField，在 1 个 UIView 中有 2 个选择器答案

【问题标题】：2 TextField with 2 picker in 1 UIView2 个 TextField，在 1 个 UIView 中有 2 个选择器
【发布时间】：2020-02-05 12:44:23
【问题描述】：

我在 1UIView 中创建了一个带有 2 个选择器的 2 个文本字段，但我无法在正确的文本字段中显示正确的选择器，因为我不知道如何识别当前处于活动状态的视图。我尝试了一些带有标签的东西（但只能使用选择器，不能使用文本字段），并创建 var current = UITextField()

var genre = ["-","Homme","Femme"]
var Sport = ["-","Tennis"]
var picker = UIPickerView()
var currentTextField = UITextField()

override func viewDidLoad() {
        super.viewDidLoad()

 picker.delegate = self
    picker.dataSource = self
    GenderTextField.inputView = picker
    WitchSportTextField.inputView = picker

func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        if currentTextField == GenderTextField{
        return genre.count
        }else{
            return Sport.count
        }
    }

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        if currentTextField == GenderTextField {
            GenderTextField.text = genre[row]
        }else{
            WitchSportTextField.text = Sport[row]
        }
    }
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        if currentTextField == GenderTextField{
        return genre[row]
         }else{
            return Sport[row]
        }
    }

某人作为一个想法？

【问题讨论】：

使用 TextField 委托。

标签： ios swift xcode uiviewcontroller uitextfield

【解决方案1】：

这是完整的代码

var genre = ["-","Homme","Femme"]
var Sport = ["-","Tennis"]
var genrepicker = UIPickerView()
var Sportpicker = UIPickerView()
var genretTextField = UITextField()
var SportTextField = UITextField()

override func viewDidLoad() {
        super.viewDidLoad()

    genrepicker.delegate = self
    genrepicker.dataSource = self

    Sportpicker.delegate = self
    Sportpicker.dataSource = self
    genretTextField.inputView = genrepicker
    SportTextField.inputView = Sportpicker

func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        if pickerView == genrepicker{
        return genre.count
        }else{
            return Sport.count
        }
    }

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        if pickerView == genrepicker {
            GenderTextField.text = genre[row]
        }else{
            WitchSportTextField.text = Sport[row]
        }
    }
   func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        if pickerView == genrepicker{
        return genre[row]
         }else{
            return Sport[row]
        }
    }

【讨论】：

【解决方案2】：

首先将您的两个 TextField 委托分配给 viewDidLoad 中的 self

GenderTextField.delegate = self
WitchSportTextField.delegate = self

使用此扩展程序来确定哪个 TextField 处于活动状态。

extension YourClass: UITextFieldDelegate {
    func textFieldDidBeginEditing(_ textField: UITextField) {
         currentTextField = textField
         picker.reloadAllComponents() //Reload for accurate data
    }
}

注意：变量名应以小写字母开头。使用描述性名称来阐明您的意图：

看看这个：https://github.com/MLSDev/development-standards/blob/master/platform/ios/swift-coding-conventions.md

【讨论】：