UIPickerView 返回“？”在 PickerWheel 上，但在 UITextField 中返回正确的值 XCode 7

Question

我真的是 programming/coding 的新手（也就是说，直到这个周末我才开始这样做），我被卡住了。我一直在关注 youtube 上的大量教程和其他东西，我相信我已经做对了一切，但是我的选择器轮子显示“？”而不是正确的值，除非“？”之一被选中时，正确的文本会显示在文本字段中。谁能发现我的错误？

我也查看了这个论坛的负载，但据我所知，我所做的一切都是正确的。

P.s。我现在不能嵌入图片，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 IBOutlets 连接您 xib/storyboard 中已经存在的选择器视图，这些视图显示在您的视图控制器中（因为您没有添加新的将选择器创建为子视图）。

确保使用 IBOutlets 并在界面生成器中设置 delegate/dataSource。这应该有望解决您的问题。

Answer 2

在问了我的一个朋友这个问题后，这是他想出的解决方案来解决我遇到的问题。

TextField returning correct data

PickerView now returning correct data

P.s。我添加了更多的选择器，因此与我第一次发布原始 question/problem.

时相比，代码确实有一些额外的内容

我希望这对其他人有帮助

import UIKit

class ProfileCreator: UIViewController, UIPickerViewDelegate, UITextFieldDelegate, UIPickerViewDataSource {

var output: Int = 0
var output2: Int = 0

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

// 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 //

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

// Current Fitness Goal Selector Text Field Start 1 //

@IBOutlet weak var CurrentFitnessGoalSelectorTextField: UITextField!
var CurrentFitnessGoalSelectorData = ["Lose Fat", "Gain Muscle", "Maintain Physique"]
var CurrentFitnessGoalSelectorPicker = UIPickerView()

// Current Fitness Goal Selector Text Field End 1 //

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

// Weekly Activity Level Text Field Start 1 //

@IBOutlet weak var WeeklyActivityLevelTextField: UITextField!
var WeeklyActivityLevelTextFieldData = ["I am sedentary (little or no exercise)", "I am lightly active (light exercise/sports 1-3 days per week)", "I am moderately active (moderate exercise/sports 3-5 days per week)", "I am very active (hard exercise/sports 6-7 days a week)", "I am extra active (very hard exercise/sports & physical job or 2 x training"]
var WeeklyActivityLevelSelectorPicker = UIPickerView()

// Weekly Activity Level 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 2 //

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

// Height Decimal Unit Selector Text Field End 2 //

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

// 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 2 //

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

// Current Weight Decimal Unit Selector Text Field End 2 //

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

// Current Fitness Goal Selector Text Field Start 2 //

    CurrentFitnessGoalSelectorPicker.delegate = self
    CurrentFitnessGoalSelectorPicker.dataSource = self
    CurrentFitnessGoalSelectorTextField.inputView = CurrentFitnessGoalSelectorPicker

// Current Fitness Goal Selector Text Field End 2 //

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

// Weekly Activity Level Selector Text Field Start 2 //

    WeeklyActivityLevelSelectorPicker.delegate = self
    WeeklyActivityLevelSelectorPicker.dataSource = self
    WeeklyActivityLevelTextField.inputView = WeeklyActivityLevelSelectorPicker

// Weekly Activity Level Selector Text Field End 2 //

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

}

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 {
        output = 1
    } else if pickerView == HeightWholeNumberUnitSelectorPicker {
        output = 2
    } else if pickerView == HeightDecimalNumberUnitSelectorPicker {
        output = 3
    } else if pickerView == CurrentWeightWholeNumberUnitSelectorPicker {
        output = 4
    } else if pickerView == CurrentWeightDecimalNumberUnitSelectorPicker {
        output = 5
    } else if pickerView == CurrentFitnessGoalSelectorPicker { output = 6
    } else if pickerView == WeeklyActivityLevelSelectorPicker {
        output = 7
    }

    switch output{
    case 1:
        return GenderSelectorData.count
    case 2:
        return HeightWholeNumberUnitSelectorData.count
    case 3:
        return HeightDecimalNumberUnitSelectorData.count
    case 4:
        return CurrentWeightWholeNumberUnitSelectorData.count
    case 5:
        return CurrentWeightDecimalNumberUnitSelectorData.count
    case 6:
        return CurrentFitnessGoalSelectorData.count
    case 7:
        return WeeklyActivityLevelTextFieldData.count
    default:
        return 1
    }
}

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    if pickerView == GenderSelectorPicker {
        output2 = 1
    } else if pickerView == HeightWholeNumberUnitSelectorPicker {
        output2 = 2
    } else if pickerView == HeightDecimalNumberUnitSelectorPicker {
        output2 = 3
    } else if pickerView == CurrentWeightWholeNumberUnitSelectorPicker {
        output2 = 4
    } else if pickerView == CurrentWeightDecimalNumberUnitSelectorPicker {
        output2 = 5
    } else if pickerView == CurrentFitnessGoalSelectorPicker {
        output2 = 6
    } else if pickerView == WeeklyActivityLevelSelectorPicker {
        output2 = 7
    }

    switch output2{
    case 1:
        return GenderSelectorData[row]
    case 2:
        return HeightWholeNumberUnitSelectorData[row]
    case 3:
        return HeightDecimalNumberUnitSelectorData[row]
    case 4:
        return CurrentWeightWholeNumberUnitSelectorData[row]
    case 5:
        return CurrentWeightDecimalNumberUnitSelectorData[row]
    case 6:
        return CurrentFitnessGoalSelectorData[row]
    case 7:
        return WeeklyActivityLevelTextFieldData[row]
    default:
        return ""
    }
}


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]
    } else if pickerView == CurrentFitnessGoalSelectorPicker {
        CurrentFitnessGoalSelectorTextField.text = CurrentFitnessGoalSelectorData[row]
    } else if pickerView == WeeklyActivityLevelSelectorPicker {
        WeeklyActivityLevelTextField.text = WeeklyActivityLevelTextFieldData[row]
    }
}
}

UIPickerView 返回“？”在 PickerWheel 上，但在 UITextField 中返回正确的值 XCode 7

UIPickerView returning "?" on PickerWheel but returning correct value in UITextField XCode 7

uipickerview

uitextfield

ios

swift

xcode7