CODEWITHSUNDEEP
iosswiftswift3datepicker
pjunior
pjunior

Reputation: 78

Calculating Age From Date Picker Swift 3

In my code below i have implemented a date picker to be the subview of my textfield. I am stuck on the function; 'verifyAge'. The if statement in the function is working fine and will change the textField colour when the Date Picker date is above or below the specified date. But it only works to the corresponding year But does not Work to the exact Day. I have tried searching for the past two days and couldn't find a solution to my exact problem.

 class AgeConfirmViewController: UIViewController, UITextFieldDelegate   {

@IBOutlet weak var txtAgeConfirmation: UITextField!
let datePicker: UIDatePicker = UIDatePicker()

 override func viewDidLoad() {
    super.viewDidLoad()
    txtAgeConfirmation.delegate = self
    createDatePicker()
    }

    func textFieldDidBeginEditing(_ textField: UITextField) {
    txtAgeConfirmation.inputView = datePicker
    datePicker.addTarget(self, action: #selector(self.datePickerChanged(sender:)), for: .valueChanged)
 }



   func datePickerChanged(sender: UIDatePicker) {
    let formatter = DateFormatter()
    formatter.timeStyle = .none
    formatter.dateStyle = .long
    txtAgeConfirmation.text = formatter.string(from: sender.date)
    verifyAge()
}


  func createDatePicker() {
    datePicker.datePickerMode = .date
    datePicker.maximumDate = Calendar.current.date(byAdding: .year, value: 0, to: Date())
}


 func verifyAge() {

    let dateOfBirth = datePicker.date
    let today = Date()
    let gregorian = NSCalendar(identifier: NSCalendar.Identifier.gregorian)
    let age = gregorian?.components([.month, .day, .year], from: dateOfBirth, to: today, options:[])

      if (age?.year)! < 21 {


        txtAgeConfirmation.textColor = UIColor.red

    } else if (age?.year)! > 21 {

        txtAgeConfirmation.textColor = UIColor.black

    }
}

Upvotes: 0

Views: 3341

Answers (1)

vadian
vadian

Reputation: 285150

Simple solution, ignore day and month:

let gregorian = Calendar(identifier: .gregorian)
let ageComponents = gregorian.dateComponents([.year], from: dateOfBirth, to: Date())
let age = ageComponents.year!

txtAgeConfirmation.textColor = age < 21 ? .red : .black

Or if you want to ignore the time

let ageComponents = calendar.dateComponents([.year], from: calendar.startOfDay(for: dateOfBirth), to: calendar.startOfDay(for: Date()))

In Swift 3 there are less question and exclamation marks by using native Calendar struct.
The age exclamation mark after year is absolutely safe because the year component is clearly specified.

Upvotes: 4

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