ios - UIPickerView 在 PickerWheel 上返回 "?"但在 UITextField XCode 7 中返回正确的值

Question

我对编程/编码真的很陌生(也就是说，直到这个周末我才这样做过)并且我陷入了困境。我一直在关注 youtube 上的大量教程和其他东西，我确信我已经做对了一切，但是我的选择轮显示“？”而不是正确的值，除非其中一个“？”选择后，正确的文本将显示在文本字段中。谁能发现我的错误吗？

我也查看过这个论坛的负载，但据我所知，我所做的一切都是正确的。

P.s.我现在无法嵌入图片，因为我太新了

TextField returning correct data

Corresponding data selected on PickerView displayed as a "?"

import UIKit

class ProfileCreator: UIViewController, UIPickerViewDelegate, UITextFieldDelegate, UIPickerViewDataSource {

// -------------------------------------------------------------------------------------- //

// DOB Selector From Text Field Start 1 //

@IBOutlet weak var DOBSelectorTextField: UITextField!

func textFieldDidBeginEditing(textField: UITextField) {
    let datepicker = UIDatePicker()
    textField.inputView = datepicker
    datepicker.datePickerMode = UIDatePickerMode.Date
    datepicker.addTarget(self, action: "datepickerchanged:", forControlEvents: .ValueChanged)
}

func textFieldShouldReturn(textField: UITextField) -> Bool {
    textField.resignFirstResponder()
    return true
}

func datepickerchanged(sender: UIDatePicker) {
    let formatter = NSDateFormatter()
    formatter.dateFormat = "dd MMMM yyyy"
    DOBSelectorTextField.text = formatter.stringFromDate(sender.date)

}

// DOB Selector From Text Field End 1 //

// -------------------------------------------------------------------------------------- //

// Gender Selector From Text Field Start 1 //

@IBOutlet weak var GenderSelectorTextField: UITextField!
var GenderSelectorData = ["Male", "Female"]
var GenderSelectorPicker = UIPickerView()

// Gender Selector From Text Field End 1 //

// -------------------------------------------------------------------------------------- //

 // Height Whole Number Text Field Start 1 //

@IBOutlet weak var HeightWholeNumberTextField: UITextField!

// Height Whole Number Text Field Start 1 //

// -------------------------------------------------------------------------------------- //

// Height Whole Number Unit Selector Text Field Start 1 //

@IBOutlet weak var HeightWholeNumberUnitSelectorTextField: UITextField!
var HeightWholeNumberUnitSelectorData = ["m", "ft"]
var HeightWholeNumberUnitSelectorPicker = UIPickerView()

// Height Whole Number Unit Selector Text Field Start 1 //

// -------------------------------------------------------------------------------------- //

// Height Decimal Number Text Field Start 1 //

@IBOutlet weak var HeightDecimalTextField: UITextField!

// Height Decimal Number Text Field End 1 //

// -------------------------------------------------------------------------------------- //

// Height Decimal Number Unit Selector Text Field Start 1 //

@IBOutlet weak var HeightDecimalNumberUnitSelectorTextField: UITextField!
var HeightDecimalNumberUnitSelectorData = ["cm", "inch"]
var HeightDecimalNumberUnitSelectorPicker = UIPickerView()

// Height Decimal Number Unit Selector Text Field End 1 //

// -------------------------------------------------------------------------------------- //

// Current Weight Whole Number Text Field Start 1 //

@IBOutlet weak var CurrentWeightWholeNumberTextField: UITextField!

// Current Weight Whole Number Text Field Start 1 //

// -------------------------------------------------------------------------------------- //

// Current Weight Whole Number Unit Selector Text Field Start 1 //

@IBOutlet weak var CurrentWeightWholeNumberUnitSelectorTextField: UITextField!
var CurrentWeightWholeNumberUnitSelectorData = ["kg", "lb"]
var CurrentWeightWholeNumberUnitSelectorPicker = UIPickerView()

// Current Weight Whole Number Unit Selector Text Field Start 1 //

// -------------------------------------------------------------------------------------- //

// Current Weight Decimal Number Text Field Start 1 //

@IBOutlet weak var CurrentWeightDecimalNumberTextField: UITextField!

// Current Weight Decimal Number Text Field End 1 //

// -------------------------------------------------------------------------------------- //

// Current Weight Decimal Number Unit Selector Text Field Start 1 //

@IBOutlet weak var CurrentWeightDecimalNumberUnitSelectorTextField: UITextField!
var CurrentWeightDecimalNumberUnitSelectorData = ["g", "oz"]
var CurrentWeightDecimalNumberUnitSelectorPicker = UIPickerView()

// Current Weight Decimal Number Unit Selector Text Field End 1 //

// -------------------------------------------------------------------------------------- //

// Close keyboard start //

func closekeyboard() {
    self.view.endEditing(true)
}

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    closekeyboard()
}

// Close keyboard end //

// -------------------------------------------------------------------------------------- //

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.

// -------------------------------------------------------------------------------------- //

// DOB Selector From Text Field Start 2 //

    DOBSelectorTextField.delegate = self

// DOB Selector From Text Field End 2 //

// -------------------------------------------------------------------------------------- //

// Gender Selector From Text Field Start 2 //

    GenderSelectorPicker.delegate = self
    GenderSelectorPicker.dataSource = self
    GenderSelectorTextField.inputView = GenderSelectorPicker

// Gender Selector From Text Field End 2 //

// -------------------------------------------------------------------------------------- //

// Height Whole Number Unit Selector Text Field Start 2 //

    HeightWholeNumberUnitSelectorPicker.delegate = self
    HeightWholeNumberUnitSelectorPicker.dataSource = self
    HeightWholeNumberUnitSelectorTextField.inputView = HeightWholeNumberUnitSelectorPicker

// Height Whole Number Unit Selector Text Field End 2 //

// -------------------------------------------------------------------------------------- //

// Height Decimal Unit Selector Text Field Start 1 //

    HeightDecimalNumberUnitSelectorPicker.delegate = self
    HeightDecimalNumberUnitSelectorPicker.dataSource = self
    HeightDecimalNumberUnitSelectorTextField.inputView = HeightDecimalNumberUnitSelectorPicker

// Height Decimal Unit Selector Text Field End 1 //

// -------------------------------------------------------------------------------------- //

// Current Weight Whole Number Unit Selector Text Field Start 2 //

    CurrentWeightWholeNumberUnitSelectorPicker.delegate = self
    CurrentWeightWholeNumberUnitSelectorPicker.dataSource = self
    CurrentWeightWholeNumberUnitSelectorTextField.inputView = CurrentWeightWholeNumberUnitSelectorPicker

// Current Weight Whole Number Unit Selector Text Field End 2 //

// -------------------------------------------------------------------------------------- //

// Current Weight Decimal Unit Selector Text Field Start 1 //

    CurrentWeightDecimalNumberUnitSelectorPicker.delegate = self
    CurrentWeightDecimalNumberUnitSelectorPicker.dataSource = self
    CurrentWeightDecimalNumberUnitSelectorTextField.inputView = CurrentWeightDecimalNumberUnitSelectorPicker

// Current Weight Decimal Unit Selector Text Field End 1 //

// -------------------------------------------------------------------------------------- //

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

// -------------------------------------------------------------------------------------- //

// Selectors Start 1 //

func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
    return 1

}

func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    if pickerView == GenderSelectorPicker {
        return GenderSelectorData.count

        } else if pickerView == HeightWholeNumberUnitSelectorPicker {
          return HeightWholeNumberUnitSelectorData.count

        } else if pickerView == HeightDecimalNumberUnitSelectorPicker {
          return HeightDecimalNumberUnitSelectorData.count

        } else if pickerView == CurrentWeightWholeNumberUnitSelectorPicker {
          return CurrentWeightWholeNumberUnitSelectorData.count

        } else if pickerView == CurrentWeightDecimalNumberUnitSelectorPicker {
          return CurrentWeightDecimalNumberUnitSelectorData.count

        }

    return 1

}

func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent comonent: Int) {
    if pickerView == GenderSelectorPicker {
        GenderSelectorTextField.text = GenderSelectorData[row]

        } else if pickerView == HeightWholeNumberUnitSelectorPicker {
          HeightWholeNumberUnitSelectorTextField.text = HeightWholeNumberUnitSelectorData[row]

        } else if pickerView == HeightDecimalNumberUnitSelectorPicker {
          HeightDecimalNumberUnitSelectorTextField.text = HeightDecimalNumberUnitSelectorData[row]

        } else if pickerView == CurrentWeightWholeNumberUnitSelectorPicker {
          CurrentWeightWholeNumberUnitSelectorTextField.text = CurrentWeightWholeNumberUnitSelectorData[row]

        } else if pickerView == CurrentWeightDecimalNumberUnitSelectorPicker {
          CurrentWeightDecimalNumberUnitSelectorTextField.text = CurrentWeightDecimalNumberUnitSelectorData[row]

}

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    if pickerView == GenderSelectorPicker {
        return GenderSelectorData[row]

        } else if pickerView == HeightWholeNumberUnitSelectorPicker {
          return HeightWholeNumberUnitSelectorData[row]

        } else if pickerView == HeightDecimalNumberUnitSelectorPicker {
          return HeightDecimalNumberUnitSelectorData[row]

        } else if pickerView == CurrentWeightWholeNumberUnitSelectorPicker {
          return CurrentWeightWholeNumberUnitSelectorData[row]

        } else if pickerView == CurrentWeightDecimalNumberUnitSelectorPicker {
          return CurrentWeightDecimalNumberUnitSelectorData[row]

        }

          return ""

    }

}

// Selectors End 1

}

Answer 1

您正在创建几个新的 UIPickerView，而不是使用 IBOutlet 连接 xib/storyboard 中已存在的选择器 View ，这些 View Controller 显示在 View Controller 中(因为您没有添加新创建的选择器 View )选择器作为 subview )。

确保使用 IBOutlets 并设置界面构建器中已存在的委托(delegate)/数据源。这有望解决您的问题。