问UIAlertController中TextFields之间的空格

EN

let alertController: UIAlertController = UIAlertController(title: "Property Type", message: "", preferredStyle: .alert)

        alertController.view.tintColor = UIColor(displayP3Red: 30.0 / 255.0, green: 53.0 / 255.0, blue: 94.0 / 255.0, alpha: 1.0)

        alertController.addTextField { (textField) -> Void in
            self.propertyTextField = textField
            self.propertyTextField.delegate = self
            self.propertyTextField.placeholder = "Please enter a property type"
        }

        alertController.addTextField { (textField) -> Void in
            self.unitPropertyTextField = textField
            self.unitPropertyTextField.delegate = self
            self.unitPropertyTextField.placeholder = "Please enter a unit number (if applicable)"
        }