How do you make UIDatePicker a 24 hour system - ios

Question

I have a UIDatePicker that is set to the hour the minutes then AM/PM. How do I make it so that it is set to the 24 hour system like in the UK? For example 1 would be 13 and there wouldn't be AM or PM.

Answer 1

var datePicker = UIDatePicker()
datePicker.datePickerMode = UIDatePickerMode.Time
datePicker.locale = NSLocale(localeIdentifier: "en_GB") // using Great Britain for this example

Answer 2

Using Swift 4
I have used the following the method to help me achieve a time-picker without AM / PM.
Note i am using TextField as Inputview
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
showTimePicker()
return true
}
func showTimePicker() {
timePicker.datePickerMode = .time
timePicker.locale = Locale(identifier: "en_GB") // Change to your locale
let toolbar = UIToolbar();
toolbar.sizeToFit()
let doneButton = UIBarButtonItem(title: "Done", style: .plain, target: self, action: #selector(doneTimePicker));
let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: nil, action: nil)
let cancelButton = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(cancelTimePicker));
toolbar.setItems([doneButton,spaceButton,cancelButton], animated: false)
modifiedHoursTextField.inputAccessoryView = toolbar
modifiedHoursTextField.inputView = timePicker
}
#objc func doneTimePicker() {
let timeFormatter = DateFormatter()
timeFormatter.dateFormat = "HH:mm"
modifiedHoursTextField.text = timeFormatter.string(from: timePicker.date)
self.view.endEditing(true)
}
#objc func cancelTimePicker() {
self.view.endEditing(true)
}

Answer 3

Bonus to JAL's answer, if you also want to be able to pick "date", you can use something like below:
viewDidLoad:
deadlineTF.inputView = deadlineDatePicker
deadlineDatePicker.timeZone = NSTimeZone.local
deadlineDatePicker.datePickerMode = UIDatePickerMode.dateAndTime
deadlineDatePicker.locale = Locale(identifier: "tr_TR")
deadlineDatePicker.backgroundColor = UIColor.white
deadlineDatePicker.layer.cornerRadius = 5.0
deadlineDatePicker.layer.shadowOpacity = 0.5
deadlineDatePicker.addTarget(self, action: #selector(onDidChangeDate), for: .valueChanged)
.
The Function:
// called when the date picker called.
#objc func onDidChangeDate(sender: UIDatePicker){
// date format
let myDateFormatter: DateFormatter = DateFormatter()
myDateFormatter.dateFormat = "dd/MM/yyyy HH:mm"
// get the date string applied date format
let mySelectedDate = myDateFormatter.string(from: sender.date)
deadlineTF.text = mySelectedDate
}