How do I get the age after using a date picker? - ios

Question

I need to get the age after the datepicker has been used. How would I do this. I can currently get the datepicker to work.
#IBAction func datepickerobj(sender: UITextField) {
let datePickerView:UIDatePicker = UIDatePicker()
datePickerView.datePickerMode = UIDatePickerMode.Date
sender.inputView = datePickerView
datePickerView.addTarget(self, action: Selector("datePickerValueChanged:"), forControlEvents: UIControlEvents.ValueChanged)
}
func datePickerValueChanged(sender:UIDatePicker) {
let dateFormatter = NSDateFormatter()
dateFormatter.dateStyle = NSDateFormatterStyle.MediumStyle
dateFormatter.timeStyle = NSDateFormatterStyle.NoStyle
dateofbirth.text = dateFormatter.stringFromDate(sender.date)
let myDOB = NSCalendar.currentCalendar().dateWithEra(1, year: 1970, month: 09, day: 10, hour: 0, minute: 0, second: 0, nanosecond: 0)!
let myAge = myDOB.age
}

Answer 1

Swift 4.1 / Xcode 9.4.1
func age(dateOfBirth: Date) -> Double {
var ageComponents: DateComponents = Calendar.current.dateComponents([.year], from: dateOfBirth, to: Date())
return Double(ageComponents.year!)
}

Answer 2

This will work fine for u
var birthday: NSDate = ..... //date that comes from date picker
var now: NSDate = NSDate()
var ageComponents: NSDateComponents = NSCalendar.currentCalendar().components(.Year, fromDate: birthday, toDate: now, options: 0)
var age: Int = ageComponents.year()
If u want to formate date you can use DateFormatter
Ex.
let usDateFormat = NSDateFormatter.dateFormatFromTemplate("MMddyyyy", options: 0, locale: NSLocale(localeIdentifier: "en-US"))
//usDateFormat now contains an optional string "MM/dd/yyyy".
let gbDateFormat = NSDateFormatter.dateFormatFromTemplate("MMddyyyy", options: 0, locale: NSLocale(localeIdentifier: "en-GB"))
//gbDateFormat now contains an optional string "dd/MM/yyyy"
formatter.dateFormat = usDateFormat
let usSwiftDayString = formatter.stringFromDate(swiftDay)
// usSwiftDayString now contains the string "06/02/2014".
formatter.dateFormat = gbDateFormat
let gbSwiftDayString = formatter.stringFromDate(swiftDay)
// gbSwiftDayString now contains the string "02/06/2014".

Answer 3

//may be it will help for u
let formatter = NSDateFormatter()
formatter.dateFormat = "yyyy"
let currentYear: Int = Int(formatter.stringFromDate(NSDate()))
let dobYear: Int = Int(formatter.stringFromDate(myDOB))
let age: Int = currentYear - dobYear

Answer 4

extension Date {
func age() -> Int {
return Int(Calendar.current.dateComponents([.year], from: self, to: Date()).year!)
}
}
An Date extension version, which let you call the method on any Date var. eg:
let calendar = NSCalendar.currentCalendar()
let components = calendar.components([NSCalendarUnit.Year, NSCalendarUnit.Month, NSCalendarUnit.Day], fromDate: NSDate.init())
components.day = 31
components.month = 1
components.year = 1979
let date = calendar.dateFromComponents(components)
let years = date.age