文本字段和日期选择器更改值

Question

我尝试使用此代码在单击文本字段时获取日期选择器：

import UIKit

class ViewController: UIViewController {

@IBOutlet weak var DOBTextField: UITextField!

override func viewDidLoad() {
    super.viewDidLoad()

    DOBTextField.addInputViewDatePicker(target: self, selector: #selector(doneButtonPressed))
}

@objc func doneButtonPressed() {
    if let  datePicker = self.DOBTextField.inputView as? UIDatePicker {
        let dateFormatter = DateFormatter()
        dateFormatter.dateStyle = .none
        dateFormatter.timeStyle = .short
        dateFormatter.locale = Locale.init(identifier: "it_IT")
        self.DOBTextField.text = dateFormatter.string(from: datePicker.date)
    }
    self.DOBTextField.resignFirstResponder()
 }
}


 extension UITextField {

   func addInputViewDatePicker(target: Any, selector: Selector) {

    let screenWidth = UIScreen.main.bounds.width

    //Add DatePicker as inputView
    let datePicker = UIDatePicker(frame: CGRect(x: 0, y: 0, width: screenWidth, height: 216))
    datePicker.datePickerMode = .time
    datePicker.locale = Locale.init(identifier: "it_IT")
    self.inputView = datePicker

    //Add Tool Bar as input AccessoryView
    let toolBar = UIToolbar(frame: CGRect(x: 0, y: 0, width: screenWidth, height: 44))
    let flexibleSpace = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
    let cancelBarButton = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(cancelPressed))
    let doneBarButton = UIBarButtonItem(title: "Done", style: .plain, target: target, action: selector)
    toolBar.setItems([cancelBarButton, flexibleSpace, doneBarButton], animated: false)

    self.inputAccessoryView = toolBar
 }

   @objc func cancelPressed() {
     self.resignFirstResponder()
   }
}

但是当我再次单击文本字段时，日期选择器的时间在 3 个维度上向前移动。如何解决这个问题？我希望日期选择器上的时间与文本字段上的时间相同。

我尝试实现这段代码，但它崩溃了：

import UIKit

class ViewController: UIViewController {

@IBOutlet weak var DOBTextField: UITextField!

override func viewDidLoad() {
    super.viewDidLoad()

    DOBTextField.addInputViewDatePicker(target: self, selector: #selector(doneButtonPressed), textFieldText: DOBTextField.text ?? "")
}

@objc func doneButtonPressed() {
    if let  datePicker = self.DOBTextField.inputView as? UIDatePicker {
        let dateFormatter = DateFormatter()
        dateFormatter.dateStyle = .none
        dateFormatter.timeStyle = .short
        dateFormatter.locale = Locale.init(identifier: "it_IT")
        self.DOBTextField.text = dateFormatter.string(from: datePicker.date)
    }
    self.DOBTextField.resignFirstResponder()
 }
}


 extension UITextField {

   func addInputViewDatePicker(target: Any, selector: Selector , textFieldText: String?) {


    let screenWidth = UIScreen.main.bounds.width

    //Add DatePicker as inputView
    let datePicker = UIDatePicker(frame: CGRect(x: 0, y: 0, width: screenWidth, height: 216))
    datePicker.datePickerMode = .time
    datePicker.locale = Locale.init(identifier: "it_IT")
    self.inputView = datePicker

    if textFieldText != nil {
        /// Set Textfield date & time
          let dateFormatter = DateFormatter()
          dateFormatter.dateStyle = .none
          dateFormatter.timeStyle = .short
          dateFormatter.locale = Locale.init(identifier: "it_IT")
          datePicker.date = dateFormatter.date(from: textFieldText!)!
      }
     else {
      /// set current date & time
      datePicker.date = Date()
    }


    //Add Tool Bar as input AccessoryView
    let toolBar = UIToolbar(frame: CGRect(x: 0, y: 0, width: screenWidth, height: 44))
    let flexibleSpace = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
    let cancelBarButton = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(cancelPressed))
    let doneBarButton = UIBarButtonItem(title: "Done", style: .plain, target: target, action: selector)
    toolBar.setItems([cancelBarButton, flexibleSpace, doneBarButton], animated: false)

    self.inputAccessoryView = toolBar
 }

   @objc func cancelPressed() {
     self.resignFirstResponder()
   }
}

如何解决这个问题？

Answer 1

据我了解，您想在日期选择器打开时显示文本字段的时间。您只需在 DatePicker 初始化时设置日期。

设置DatePicker的日期:

extension UITextField {

func addInputViewDatePicker(target: Any, selector: Selector , textFieldText:String?) {


//Add DatePicker as inputView

//Set date for date Picker
  if textFieldText != nil {
      /// Set Textfield date & time
        let dateFormatter = DateFormatter()
        dateFormatter.dateStyle = .none
        dateFormatter.timeStyle = .short
        dateFormatter.locale = Locale.init(identifier: "it_IT")
        datePicker.date = dateFormatter.date(from: textFieldText!)!
    }
   else {
    /// set current date & time
    datePicker.date = Date()
  }

     //Add Tool Bar as input AccessoryView
  }
}

viewDidLoad 的变化：

override func viewDidLoad() {
    super.viewDidLoad()

    DOBTextField.addInputViewDatePicker(target: self, selector: #selector(doneButtonPressed), textFieldText: DOBTextField.text ?? "")
}

希望您了解必须使用日期选择器设置的内容。如果此代码无法正常工作，请执行文本字段操作（编辑已开始）并尝试在操作中设置文本字段 inputView。

Answer 2

这个问题好像只出现在模拟器上。当我尝试在真实设备上测试此代码时，一切正常。可能只是 Xcode 错误。

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