iOS 14 UIDatePickerの以前と同じサイズ指定

iOS14 以降でUITextField の入力補助として UIDatePicker を使っている場合に
以前と同じサイズでピッカーを利用する例

    lazy var datePicker: UIDatePicker = {
        let datePicker: UIDatePicker = UIDatePicker()
        datePicker.datePickerMode = UIDatePicker.Mode.date
        datePicker.timeZone = NSTimeZone.local
        datePicker.locale = Locale.getPreferred()
        datePicker.date = Calendar.current.date(byAdding: .hour, value: 1, to: Date())!
        datePicker.minimumDate = Date()
        
        if #available(iOS 13.4, *) {
            datePicker.frame = CGRect(x: 0, y: 0, width: self.view.bounds.width, height: 250.0)
            datePicker.preferredDatePickerStyle = .wheels
        }
        return datePicker
    }()


    self.textField.inputView                = self.datePicker