ios - 一页上有多个 UITextFields 显示日期，但只有一个 UITextFields 显示从两个 DatePickers 中选择的日期

Question

我目前有 2 个 UITextField，一个需要返回日期，另一个需要返回时间。

我遇到的问题是，如果我单击第一个文本字段(即“出生日期:”)，则会返回我选择的日期(显然这正是我想要发生的情况) ，如果我单击第二个文本字段(即“第一顿饭的时间:”)，第二个文本字段不会更新，但第一个文本字段会更新(这是我的第一个问题)。

我遇到的下一个问题是，当我单击第二个文本字段(即“第一顿饭的时间:”)时，选择器上显示日期，而不是时间(我希望显示时间) .

我认为这两个问题是相关的，但我无法弄清楚我缺少什么来区分这两个选择器。

计划是让第三个文本字段(即“最后一餐时间”)也显示一个时间(与第二个文本字段显示不同)，所以我想一旦我能得到我目前遇到的这两个问题排序后，我可以将相同的解决方案应用于第三个文本字段。

正如您可以想象的那样(基于我拥有的文本字段的数量)，我已将代码缩减为仅与日期选择器相关的位。

Picture of text fields from my storyboard

Picture of date picker (the same picker shows up for both text fields)

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(DOBtextField: UITextField) {
    let DOBPicker = UIDatePicker()
    DOBtextField.inputView = DOBPicker
    DOBPicker.datePickerMode = UIDatePickerMode.Date
    DOBPicker.addTarget(self, action: "DOBpickerchanged:", forControlEvents: .ValueChanged)
}

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

}

func DOBpickerchanged(DOBsender: UIDatePicker) {
    let DOBformatter = NSDateFormatter()
    DOBformatter.dateFormat = "dd MMMM yyyy"
    DOBSelectorTextField.text = DOBformatter.stringFromDate(DOBsender.date)

}

// DOB Selector From Text Field End 1 //

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

// First Meal Time Text Field Start 1 //

@IBOutlet weak var FirstMealTimeTextField: UITextField!

@IBAction func FirstMealTimeTextField(FirstMealTimeSender: UITextField) {

    let FirstMealTimePicker = UIDatePicker()
    FirstMealTimeSender.inputView = FirstMealTimePicker
    FirstMealTimePicker.datePickerMode = UIDatePickerMode.Time
    FirstMealTimePicker.addTarget(self, action: "FirstMealTimeChanged:", forControlEvents: .ValueChanged)

}

func FirstMealTimeChanged(FirstMealTimesender: UIDatePicker) {
    let FirstMealtimeFormatter = NSDateFormatter()
    FirstMealtimeFormatter.dateFormat = "HH:mm"
    FirstMealTimeTextField.text = FirstMealtimeFormatter.stringFromDate(FirstMealTimesender.date)
}

// First Meal Time Text Field End 1 //

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

override func viewDidLoad() {
    super.viewDidLoad()

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

// DOB Selector From Text Field Start 2 //

    DOBSelectorTextField.delegate = self

// DOB Selector From Text Field End 2 //

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

// First Meal Time Text Field Start 2 //

    FirstMealTimeTextField.delegate = self

// First Meal Time Text Field End 2 //

}

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

这是与我的“创建个人资料”页面相关的完整代码。也许这有助于理解我迄今为止所做的事情。我对创建数据来自数组的选择器相当有信心，我正在努力解决的是在同一页面上执行多个日期选择器。

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(DOBtextField: UITextField) {
    let DOBPicker = UIDatePicker()
    DOBtextField.inputView = DOBPicker
    DOBPicker.datePickerMode = UIDatePickerMode.Date
    DOBPicker.addTarget(self, action: "DOBpickerchanged:", forControlEvents: .ValueChanged)
}

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

}

func DOBpickerchanged(DOBsender: UIDatePicker) {
    let DOBformatter = NSDateFormatter()
    DOBformatter.dateFormat = "dd MMMM yyyy"
    DOBSelectorTextField.text = DOBformatter.stringFromDate(DOBsender.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 //

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

// First Meal Time Text Field Start 1 //

@IBOutlet weak var FirstMealTimeTextField: UITextField!

@IBAction func FirstMealTimeTextField(FirstMealTimeSender: UITextField) {

    let FirstMealTimePicker = UIDatePicker()
    FirstMealTimeSender.inputView = FirstMealTimePicker
    FirstMealTimePicker.datePickerMode = UIDatePickerMode.Time
    FirstMealTimePicker.addTarget(self, action: "FirstMealTimeChanged:", forControlEvents: .ValueChanged)

}

func FirstMealTimeChanged(FirstMealTimesender: UIDatePicker) {
    let FirstMealtimeFormatter = NSDateFormatter()
    FirstMealtimeFormatter.dateFormat = "HH:mm"
    FirstMealTimeTextField.text = FirstMealtimeFormatter.stringFromDate(FirstMealTimesender.date)
}

// First Meal Time Text Field End 1 //

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

// Last Meal Time Text Field Start 1 //



// Last Meal Time 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()

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

// 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 //

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

// First Meal Time Text Field Start 2 //

    FirstMealTimeTextField.delegate = self

// First Meal Time 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 component: 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]
    }
}
}

Answer 1

首先 - 在文本字段委托(delegate)回调中创建文本字段没有任何意义。我看到 IBOutlet 声明，所以我假设您正在使用 Storyboard。如果是这样，那么场景中已经拥有所有文本字段实例。只需创建一个从 EACH 文本字段到 Controller 的导出，以便您可以在需要时在代码中引用它们。

接下来，所有文本字段将调用相同的委托(delegate)或目标/操作方法。因此，在每个方法中，您需要找出哪个文本字段正在调用它并进行特殊处理。

    func textFieldDidBeginEditing(textfield: UITextField) {

    if textField == self.textField1 {
       //do something to textfield1 
   }
    else if textfield == textfield2 {
      //do something to textfield2
    } 
etc....
}