Forcing user not to put previous time on time pickers - ios

Question

I’m using time pickers and they work correctly as expected but the problem that i dont want to user to reserve a past time. when i click on the time pickers they doesn’t allow me to reserve past time but the problem is when i leave it opened and time continues it allow me to choose past time which is the time i click on it for example i opened time picker at 10:11 when i leave time picker opened and its 10:12 it allow me to choose 10:11 which is in past. im planning to show an error massage and force the time pickers to set time at current time if user chooses start time < current time. Hope its clear and this is my code if you can help
func createTimePicker() {
StartTimeTxt.textAlignment = .center
EndTimeTxt.textAlignment = .center
//tool bar
let toolbar = UIToolbar()
toolbar.sizeToFit()
//bar button(
let doneBtn = UIBarButtonItem(barButtonSystemItem: .done, target: nil, action: #selector(donePressed))
toolbar.setItems([doneBtn], animated: true)
//assign tool bar
StartTimeTxt.inputAccessoryView = toolbar
EndTimeTxt.inputAccessoryView = toolbar
// assign time picker to the txt field
StartTimeTxt.inputView = StartTimePicker
EndTimeTxt.inputView = EndTimePicker
let calendar = Calendar.current
//First range
let startTime = Date()
let startRangeEnd = calendar.date(byAdding: DateComponents(minute: 30), to: startTime)!
let startRange = startTime...startRangeEnd
//Second range
let endTime = calendar.date(byAdding: DateComponents(minute: 1), to: startRangeEnd)!
let endRangeEnd = calendar.startOfDay(for: calendar.date(byAdding: DateComponents(day: 1), to: startTime)!)
let endRange = endTime...endRangeEnd
StartTimePicker.date = startTime
StartTimePicker.minimumDate = startTime
StartTimePicker.maximumDate = startRangeEnd
EndTimePicker.date = endTime
EndTimePicker.minimumDate = endTime
EndTimePicker.maximumDate = endRangeEnd
if #available(iOS 13.4, *) {
StartTimePicker.preferredDatePickerStyle = .wheels
EndTimePicker.preferredDatePickerStyle = .wheels
}
}
#objc func donePressed(){
// formatter
let calendar = Calendar.current
let startTime = Date()
let startRangeEnd = calendar.date(byAdding: DateComponents(minute: 30), to: startTime)!
let startRange = startTime...startRangeEnd
//Second range
let endTime = calendar.date(byAdding: DateComponents(minute: 1), to: startRangeEnd)!
let endRangeEnd = calendar.startOfDay(for: calendar.date(byAdding: DateComponents(day: 1), to: startTime)!)
let endRange = endTime...endRangeEnd
let formatter = DateFormatter()
formatter.dateStyle = .none
formatter.timeStyle = .short
StartTimeTxt.text = formatter.string(from: StartTimePicker.date)
self.view.endEditing(true)
EndTimeTxt.text = formatter.string(from: EndTimePicker.date)
self.view.endEditing(true)
formatter.locale = Locale(identifier: "en_US_POSIX")
formatter.dateFormat = "h:mm a"
startTimer = formatter.string(from: StartTimePicker.date)
endTimer = formatter.string(from: EndTimePicker.date)
// print(start, end)
// Format and print in 12h format
let hourAndMinutes = Calendar.current.dateComponents([.hour, .minute], from: StartTimePicker.date, to: EndTimePicker.date)
print(hourAndMinutes)
// Calculate price, the formula is just an example
var minutesPrice = 0
if ( hourAndMinutes.minute! == 0 ){
minutesPrice = 0
}
else {
minutesPrice = 15
}
let price = hourAndMinutes.hour! * 15 + minutesPrice
TotalPrice.text = String(price) + "SAR"
} ```