pickerView didSelectRow正在输入错误的UITextField

Question

我试图遵循以下solution在一个UIViewController上有多个UIPickerViews。他们建议我已经完成了每个UITextfield的标记，并且能够实现行数，行标题和组件数。但是，在实现did选择行时，我遇到了绊脚石。当我选择UITextField时，它会突出显示另一个UITextfield。下面是我到目前为止的代码。 class DriverViewController：UIViewController {

var selectedTrack: String?

var firstDriver: String?

var secondDriver: String?

var thirdDriver: String?
let  tracks = ["Melbourne", "Manama", "Shanghai", "Baku",
               "Barcelona", "Monaco", "Montreal","Le Castellet","Spielberg",
               "Silverstone","Hockenheim","Budapest","Francorchamps","Monza","Singapore","Sochi","Suzuka","Austin","Interlagos","Abu Dhabi"]
let drivers = ["Lewis Hamilton","Antonio Giovinazzi","Kimi Raikkonen","Charles Leclerc","Sebastian Vettel","Romain Grosjean","Kevin Magnussen","Lando Norris",
               "Carlos Sainz","Valtteri Bottas","Sergio Perez","Lance Stroll","Pierre Gasly","Max Verstappen","Nico Hulkenberg","Daniel Ricciardo","Alexander Albon","Daniil Kvyat","Robert Kubica","George Russell"]
@IBOutlet weak var TrackTextField: UITextField!


@IBOutlet weak var firstTextField: UITextField!

@IBOutlet weak var secondTextField: UITextField!


@IBOutlet weak var thirdTextField: UITextField!


override func viewDidLoad() {
    super.viewDidLoad()


    createTrackPicker()
    createDriverPicker()
    createToolBar()
    // Do any additional setup after loading the view.
}

func createTrackPicker() {
    let trackPicker = UIPickerView()
    trackPicker.tag = 0
    trackPicker.delegate = self
    TrackTextField.inputView = trackPicker
}

func createDriverPicker() {
    let driverPicker = UIPickerView()
    driverPicker.tag = 1
    driverPicker.tag = 2
    driverPicker.tag = 3
    driverPicker.delegate = self
    firstTextField.inputView = driverPicker
    secondTextField.inputView = driverPicker
    thirdTextField.inputView = driverPicker
}

func createToolBar() {

    let toolBar = UIToolbar()
    toolBar.sizeToFit()
    let doneButton = UIBarButtonItem(title: "Done", style: .plain, target: self, action: #selector(ViewController.dismissKeyboard))
    toolBar.setItems([doneButton], animated: false)
    toolBar.isUserInteractionEnabled = true
    TrackTextField.inputAccessoryView = toolBar
    firstTextField.inputAccessoryView = toolBar
    secondTextField.inputAccessoryView = toolBar
    thirdTextField.inputAccessoryView = toolBar

}
@objc func dismissKeyboard() {
    view.endEditing(true)
}
/*
// MARK: - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    // Get the new view controller using segue.destination.
    // Pass the selected object to the new view controller.
}
 */

}

 extension DriverViewController: UIPickerViewDelegate, UIPickerViewDataSource {
 func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    if pickerView.tag == 0 {
        return tracks.count
    } else {
        return drivers.count
    }
}


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

func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    if pickerView.tag == 0 {
        return "\(tracks[row])"
    } else {
        return "\(drivers[row])"
    }
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    if pickerView.tag == 0 {
        selectedTrack = tracks[row]
        TrackTextField.text = selectedTrack
    } else if pickerView.tag == 1 {
        firstDriver = drivers[row]
        firstTextField.text = firstDriver
    } else if pickerView.tag == 2 {
        secondDriver = drivers[row]
        secondTextField.text = secondDriver
    } else if pickerView.tag == 3 {
        thirdDriver = drivers[row]
        thirdTextField.text = thirdDriver
    }
  }
}

这就是它在screen.上的样子

Answer 1

看看你的功能：

func createDriverPicker() {
    let driverPicker = UIPickerView()
    driverPicker.tag = 1
    driverPicker.tag = 2
    driverPicker.tag = 3
    driverPicker.delegate = self
    firstTextField.inputView = driverPicker
    secondTextField.inputView = driverPicker
    thirdTextField.inputView = driverPicker
}

想想这个代码运行后tag属性有什么价值，记住它只能有一个值。

您需要在每次文本字段开始编辑时更新选择器视图的tag属性，或者您应该放弃使用标记并只检查哪个文本字段当前是第一个响应者。有关如何完成此操作的示例，请参阅UIPickerView for each text field with different arrays (Swift/Firebase)。