UIPickerView is not selecting the date in UITextField - swift

Question

I am new in swift. On executing this app login screen goes to sign in.On selecting "Already have account sign up".You get to sign up view. In the sign up trying to develop the picker view.These are two issues arise while developing picker view
1) picker view should be hidden on loading view controller .but picker view is visible as view controller appear?
2) In date of birth pickview when a done button on date picker view is selected the app crash .but it should display the corresponding date in a text field?
func showDatePicker(){
//Formate Date
datePicker.datePickerMode = .date
//ToolBar
let toolbar = UIToolbar();
toolbar.sizeToFit()
let doneButton = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.bordered, target: self, action: "donedatePicker")
let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: nil, action: nil)
let cancelButton = UIBarButtonItem(title: "Cancel", style: UIBarButtonItemStyle.bordered, target: self, action: "cancelDatePicker")
toolbar.setItems([doneButton,spaceButton,cancelButton], animated: false)
dateTextField.inputAccessoryView = toolbar
dateTextField.inputView = datePicker
}
func donedatePicker(){
let formatter = DateFormatter()
formatter.dateFormat = "dd/MM/yyyy"
dateTextField.text = formatter.string(from: datePicker.date)
self.view.endEditing(true)
}
func cancelDatePicker(){
self.view.endEditing(true)
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
pickerView.delegate=self
pickerView.dataSource=self
genderTextField.inputView=pickerView
showDatePicker()
}
How to avoid this crash. You can download the project from this link https://drive.google.com/file/d/1a6Pmw2gVDwLP9grL8tG72NBx-tKwZozI/view?usp=sharing

Answer 1

you miss few things in view did load I had updated the code
override func viewDidLoad() {
super.viewDidLoad()
pickerView.delegate=self
pickerView.dataSource=self
genderTextField.inputView = pickerView
genderTextField.delegate = self
dateTextField.delegate = self
}
Assign the text field delegate and implement the function textFieldShouldBeginEditing function for showing the Date Picker
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
if textField.tag == 1 { //Date Text Field
showDatePicker()
}
return true
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
I had assigned the tag value of Date Text Field from the storyboard and hide the picker view from the storyboard. It will solve your both points

Answer 2

First you need to give delegate to UITextField i.e
dateTextField.delegate = self
and then you need to confirm with UITextFieldDelegate method with sign up class i.e
func textFieldDidBeginEditing(_ textField: UITextField) {
if textField == dateTextField {
self.showDatePicker()
}
}
Use this above code may it helps you.

Answer 3

override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
pickerView.delegate=self
pickerView.dataSource=self
genderTextField.inputView=pickerView
showDatePicker()
}
The mistake is here. When the view is load in viewDidLoad, date picker is show itself. So you must add a action for click to show you picker view and call it in there.
For example
#objc fileprivate func showIt(_ sender:UIButton){
showDatePicker()
}
Also your action must be set wit #selector
let doneButton = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.bordered, target: self, action: "donedatePicker")
changed to
let doneButton = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.bordered, target: self, action: #selector(donedatePicker))
And for error #1 you must be make firstResponder UITextField somehow, you must resign it.
Can you add this function for textFieldDelegate.
extension YourViewController: UITextFieldDelegate{
func textFieldDidBeginEditing(_ textField: UITextField) {
if textField.isFirstResponder{
showDatePicker()
}
}
}

Answer 4

you should b calling this showDatePicker() on a tap at date textfield.
func textFieldDidBeginEditing(_ textField: UITextField) {
let datePicker = UIDatePicker()
if startDateTxt == textField{
textField.inputView = datePicker
datePicker.addTarget(self, action: #selector(showDatePicker()), for: .valueChanged)
}
}
and for 2nd error:
let doneButton = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.bordered, target: self, action: #selector(donedatePicker))