如何在IQKeyboardManagerSwift中添加datepickerview

我是SWIFT的新手，我面临着在IQKeyboManagerSwift上显示Dataickerview的问题。

我正在尝试这样的代码，但它不起作用。

func textFieldDidBeginEditing(_ textField: UITextField) {
    self.dischargeDateTextField = textField

    // Create a date picker for the date field.
    let picker = UIDatePicker()
    picker.datePickerMode = .date
    picker.addTarget(self, action: #selector(updateDateField(sender:)), for: .valueChanged)

    // If the date field has focus, display a date picker instead of keyboard.
    // Set the text to the date currently displayed by the picker.
    textField.inputView = picker
    textField.text = formatDateForDisplay(date: picker.date)
}

// Called when the date picker changes.

@objc func updateDateField(sender: UIDatePicker) {
    dischargeDateTextField?.text = formatDateForDisplay(date: sender.date)
}


// Formats the date chosen with the date picker.

fileprivate func formatDateForDisplay(date: Date) -> String {
    let formatter = DateFormatter()
    formatter.dateFormat = "dd MMM yyyy"
    return formatter.string(from: date)
}

我需要“yyyy-mm-dd”的日期格式，但它只显示在图像中。

https://i.stack.imgur.com/rnxaX.jpg

我像这样改变代码

fileprivate func formatDateForDisplaySurgery(date: Date) -> String {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyy-mm-dd"
        return formatter.string(from: date)
    }

但它不起作用