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第二次单击文本字段时打开日期选择器

uidatepicker uitextfield swift3 ios
  •  0
  • USER9561  · 技术社区  · 7 年前

    我有一个文本字段,点击它可以打开一个自定义日期选择器。但第一次单击时,键盘打开,第二次单击时,日期选择器打开。请帮助我如何在第一次单击时显示日期选择器。eodDateTime我的文本字段,我希望在单击文本字段时显示日期选择器,并在同一文本字段中显示选定的日期时间

    这是我的代码: 

    import UIKit

class ATMDiscrepancyViewController: UIViewController, UIScrollViewDelegate,UITextFieldDelegate
{
var datePicker : UIDatePicker!

@IBOutlet weak var remarks: UITextField!
@IBOutlet weak var lastTransaction: UITextField!
@IBOutlet weak var eodDateTime: UITextField!

var atmData : SelectedATM! 
@IBOutlet weak var scrollView: UIScrollView!
var activeField: UITextField?

var selectedDate : String = ""
var alertControllerScanCode:CustViewController!
let button = UIButton(type: UIButtonType.custom)
}

@IBOutlet weak var saveAction: UIButton!

func datePickerValuechanged (sender : UIDatePicker)
{
    let dateFormatter = DateFormatter()
    dateFormatter.dateStyle = DateFormatter.Style.medium
    dateFormatter.timeStyle = DateFormatter.Style.none
    eodDateTime.text = dateFormatter.string(from: sender.date)
    selectedDate = dateFormatter.string(from: sender.date)
    self.view.endEditing(true)
}


@IBAction func eodAction(_ sender: UITextField) {

    deregisterFromKeyboardNotifications()
    self.button.isHidden=true
    self.pickUpDate(eodDateTime)
}
func pickUpDate(_ textField : UITextField){
    deregisterFromKeyboardNotifications()
    self.button.isHidden=true
    self.button.isEnabled = false
     NotificationCenter.default.addObserver(self, selector: #selector(ATMDiscrepancyViewController.keyboardRemoveReturn(_:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
    // DatePicker
    self.datePicker = UIDatePicker(frame:CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: 216))
    self.datePicker.backgroundColor = UIColor.white
    self.datePicker.datePickerMode = UIDatePickerMode.dateAndTime
    textField.inputView = self.datePicker

    // ToolBar
    let toolBar = UIToolbar()
    toolBar.barStyle = .default
    toolBar.isTranslucent = true
    toolBar.tintColor = UIColor(red: 92/255, green: 216/255, blue: 255/255, alpha: 1)
    toolBar.sizeToFit()

    // Adding Button ToolBar
    let doneButton = UIBarButtonItem(title: "Done", style: .plain, target: self, action: #selector(ATMDiscrepancyViewController.doneClick))
    let spaceButton = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
    let cancelButton = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(ATMDiscrepancyViewController.cancelClick))
    toolBar.setItems([cancelButton, spaceButton, doneButton], animated: false)
    toolBar.isUserInteractionEnabled = true
    textField.inputAccessoryView = toolBar
}


func doneClick() {
    let dateFormatter1 = DateFormatter()
   // let timeFormatter = DateFormatter()
    dateFormatter1.dateStyle = .medium
    dateFormatter1.timeStyle = .none
    dateFormatter1.dateFormat = "yyyy-MM-dd HH:mm:SS"
    eodDateTime.text = dateFormatter1.string(from: datePicker.date)

    eodDateTime.resignFirstResponder()
}
func cancelClick() {
    eodDateTime.resignFirstResponder()
}

func handleDatePicker(sender: UIDatePicker) {
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd"
    eodDateTime.text = dateFormatter.string(from: sender.date)
    selectedDate = dateFormatter.string(from: sender.date) 
}

func doneButton(sender:UIButton)
{
    eodDateTime.resignFirstResponder() // To resign the inputView on clicking done.
    eodDateTime.text = selectedDate
}

override func viewDidLoad() {
    super.viewDidLoad()
    self.navigationItem.title = "Discrepancy"

    registerForKeyboardNotifications()

    button.setTitle("Return", for: UIControlState())
    button.setTitleColor(UIColor.black, for: UIControlState())
    button.frame = CGRect(x: 0, y: 163, width: 106, height: 53)
    button.adjustsImageWhenHighlighted = false
    button.addTarget(self, action: #selector(ATMDiscrepancyViewController.Done(_:)), for: UIControlEvents.touchUpInside)

    let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(ATMDiscrepancyViewController.dismissKeyboard))
    view.addGestureRecognizer(tap)

    self.remarks.delegate = self
    self.lastTransaction.delegate = self
    self.eodDateTime.delegate = self 
}


override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    self.view.endEditing(true)
}

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {

    if textField == self.lastTransaction || textField == self.remarks {

         let textString = (textField.text as! NSString).replacingCharacters(in: range, with: string)

         return true
    }
    let allowedCharacters = CharacterSet.decimalDigits
    let characterSet = CharacterSet(charactersIn: string)
    return allowedCharacters.isSuperset(of: characterSet)
}

func textFieldShouldReturn(_ textField: UITextField) -> Bool {

    self.lastTransaction.resignFirstResponder()
    self.remarks.resignFirstResponder()

        self.button.isHidden=true
         self.lastTransaction.becomeFirstResponder()
        dismissKeyboard()

        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillBeHidden(notification:)), name: NSNotification.Name.UIKeyboardWillHide, object: nil)

    }
    if textField == self.lastTransaction
    {
        if isEmptyValidate(edit: self.lastTransaction) == true
        {
            return false
        }
        self.button.isHidden = true
        self.remarks.becomeFirstResponder()
    }

    if textField == self.remarks
    {
        if isEmptyValidate(edit: self.remarks)
        {
            return false
        }
    }
    return true
}

 func valid() -> Bool
{

    if isEmptyValidate(edit: eodDateTime) == true
    {
        return false
    }
    return true
}

func isEmptyValidate(edit : UITextField) ->Bool
{
    if edit.text?.isEmpty ?? true
    {
        edit.attributedPlaceholder = NSAttributedString(string: "Enter value", attributes: [NSForegroundColorAttributeName : UIColor.red])
        return true
    }
    return false
}


func registerForKeyboardNotifications(){

    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(_:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillBeHidden(notification:)), name: NSNotification.Name.UIKeyboardWillHide, object: nil)

}


func deregisterFromKeyboardNotifications(){
    //Removing notifies on keyboard appearing
    NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillShow, object: nil)
    NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}

func keyboardWasShown(notification: NSNotification){
    //Need to calculate keyboard exact size due to Apple suggestions
    self.scrollView.isScrollEnabled = true
    var info = notification.userInfo!
    let keyboardSize = (info[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.size
    let contentInsets : UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize!.height, 0.0)

    self.scrollView.contentInset = contentInsets
    self.scrollView.scrollIndicatorInsets = contentInsets

    var aRect : CGRect = self.view.frame
    aRect.size.height -= keyboardSize!.height
    if let activeField = self.activeField{
        if (!aRect.contains(activeField.frame.origin)){
            self.scrollView.scrollRectToVisible(activeField.frame, animated: true)
        }
    }
}

func keyboardWillBeHidden(notification: NSNotification){
    //Once keyboard disappears, restore original positions
    var info = notification.userInfo!
    self.view.endEditing(true)
    self.scrollView.isScrollEnabled = true
}

func textFieldDidBeginEditing(_ textField: UITextField){
    if textField == self.lastTransaction  {
        //self.button.isHidden = true;

         NotificationCenter.default.addObserver(self, selector: #selector(ATMDiscrepancyViewController.keyboardRemoveReturn(_:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
    }

    activeField = textField

    NotificationCenter.default.addObserver(self, selector: #selector(ATMDiscrepancyViewController.keyboardWillShow(_:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
}

func textFieldDidEndEditing(_ textField: UITextField){
    activeField = nil
}
func dismissKeyboard() {
    view.endEditing(true)
}


func keyboardWillShow(_ note : Notification) -> Void{
    DispatchQueue.main.async { () -> Void in
        self.button.isHidden = false
        self.scrollView.isScrollEnabled = true
        var info = note.userInfo!
        let keyBoardWindow = UIApplication.shared.windows.last
        self.button.frame = CGRect(x: 0, y: (keyBoardWindow?.frame.size.height)!-53, width: 106, height: 53)
        keyBoardWindow?.addSubview(self.button)
        keyBoardWindow?.bringSubview(toFront: self.button)
        let keyboardSize = (info[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.size
        let contentInsets : UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize!.height, 0.0)

        self.scrollView.contentInset = contentInsets
        self.scrollView.scrollIndicatorInsets = contentInsets

        var aRect : CGRect = self.view.frame
        aRect.size.height -= keyboardSize!.height
        if let activeField = self.activeField {
            if (!aRect.contains(activeField.frame.origin)){
                self.scrollView.scrollRectToVisible(activeField.frame, animated: true)
            }
        }

        UIView.animate(withDuration: (((note.userInfo! as NSDictionary).object(forKey: UIKeyboardAnimationCurveUserInfoKey) as AnyObject).doubleValue)!, delay: 0, options: UIViewAnimationOptions.curveEaseIn, animations: { () -> Void in
            self.view.frame = self.view.frame.offsetBy(dx: 0, dy: 0)
        }, completion: { (complete) -> Void in

        })   
    }
}

func Done(_ sender : UIButton){

    DispatchQueue.main.async { () -> Void in

        self.textFieldShouldReturn(self.activeField!)
    }    
}

func keyboardRemoveReturn(_ note : Notification) -> Void{
    DispatchQueue.main.async { () -> Void in
        self.button.isHidden = true

        UIView.animate(withDuration: (((note.userInfo! as NSDictionary).object(forKey: UIKeyboardAnimationCurveUserInfoKey) as AnyObject).doubleValue)!, delay: 0, options: UIViewAnimationOptions.curveEaseIn, animations: { () -> Void in
            self.view.frame = self.view.frame.offsetBy(dx: 0, dy: 0)
        }, completion: { (complete) -> Void in

        })
    }

}

}

    谢谢

    2 回复  |  直到 7 年前
        1
  •  1
  •   Mahendra    7 年前

    单击按钮使第一响应者启动 

    @IBAction func eodAction(_ sender: UITextField) {

    deregisterFromKeyboardNotifications()
    self.button.isHidden=true
    eodDateTime.becomeFirstResponder()
//        self.pickUpDate(eodDateTime)
}

    和实施 textFieldShouldBeginEditing 在输入视图中显示日期选择器的方法 

    extension ATMDiscrepancyViewController: UITextFieldDelegate {

func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
    if textField == eodDateTime {
        self.pickUpDate(eodDateTime)
    }
}
}
        2
  •  1
  •   Nitish    7 年前

    我无法理解整个代码,但解决此问题的最佳方法是将选择器指定为 viewDidLoad 。因此,请将您正在使用的以下代码放入 viewDidLoad视图 它应该可以很好地工作: 

    self.datePicker = UIDatePicker(frame:CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: 216))
self.datePicker.backgroundColor = UIColor.white
self.datePicker.datePickerMode = UIDatePickerMode.dateAndTime
textField.inputView = self.datePicker
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