问如何让用户选择日历事件的时间和日期-swift？

EN

@IBOutlet weak var eventNameTextField: UITextField!
@IBOutlet weak var descriptionTextField: UITextField!
@IBOutlet weak var startDateTextField: UITextField!
@IBOutlet weak var endDateTextField: UITextField!

@IBAction func doneButton(_ sender: Any) {
    addEventToCalendar(title: eventNameTextField.text!, description: descriptionTextField.text!, startDate: startDateTextField.text!, endDate: endDateTextField.text!)
}


let datePicker1 = UIDatePicker()
let datePicker2 = UIDatePicker()

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.

    startDateTextField.delegate = self
    endDateTextField.delegate = self

    createDatePicker1()
    createDatePicker2()

    let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(CalculatorViewController.textFieldShouldReturn))
    view.addGestureRecognizer(tap)

}

func createDatePicker1(){

    //assign datepicker to our textfield
    startDateTextField.inputView = datePicker1
    datePicker1.datePickerMode = .dateAndTime

    //create a toolbar
    let toolbar = UIToolbar()
    toolbar.sizeToFit()

    //add a done button on this toolbar
    let doneButton = UIBarButtonItem(barButtonSystemItem: .done, target: nil, action: #selector(doneClicked1))

    toolbar.setItems([doneButton], animated: true)

    startDateTextField.inputAccessoryView = toolbar
    endDateTextField.inputAccessoryView = toolbar
}

func createDatePicker2(){

    //assign datepicker to our textfield
    endDateTextField.inputView = datePicker2
    datePicker2.datePickerMode = .dateAndTime

    //create a toolbar
    let toolbar = UIToolbar()
    toolbar.sizeToFit()

    //add a done button on this toolbar
    let doneButton = UIBarButtonItem(barButtonSystemItem: .done, target: nil, action: #selector(doneClicked2))

    toolbar.setItems([doneButton], animated: true)

    endDateTextField.inputAccessoryView = toolbar
}

@objc func doneClicked1(){

    let dateFormatter = DateFormatter()
    dateFormatter.dateStyle = .medium
    dateFormatter.dateFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ssZZZ"
    dateFormatter.timeStyle = .short

    startDateTextField.text = dateFormatter.string(from: datePicker1.date)
    self.view.endEditing(true)

}

@objc func doneClicked2(){

    let dateFormatter = DateFormatter()
    dateFormatter.dateStyle = .medium
    dateFormatter.dateFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ssZZZ"
    dateFormatter.timeStyle = .short

    endDateTextField.text = dateFormatter.string(from: datePicker2.date)
    self.view.endEditing(true)

}

func addEventToCalendar(title: String, description: String?, startDate: Date, endDate: Date, completion: ((_ success: Bool, _ error: NSError?) -> Void)? = nil) {
    let eventStore = EKEventStore()

    eventStore.requestAccess(to: .event, completion: { (granted, error) in
        if (granted) && (error == nil) {
            let event = EKEvent(eventStore: eventStore)
            event.title = title
            event.startDate = startDate
            event.endDate = endDate
            event.notes = description
            event.calendar = eventStore.defaultCalendarForNewEvents
            do {
                try eventStore.save(event, span: .thisEvent)
            } catch let e as NSError {
                completion?(false, e)
                return
            }
            completion?(true, nil)
        } else {
            completion?(false, error as NSError?)
        }
    })
}

/*
// MARK: - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    // Get the new view controller using segue.destination.
    // Pass the selected object to the new view controller.
}
*/