如何在swift 3编程语言中正确使用选择器

Question

我是swift 3的新手，并且已经阅读了Ray Wenderlich的iOS学徒第3部分（My Locations）的某些部分。我已经通过Xcode 8的提示帮助传递了示例代码。但是当我来到第120页，说一些选择器时，我无法正确运行Xcode 8.它投诉错误消息如下：

2016-10-07 11：10：57.975 test051_MyLocations [2732：65640] - [test051_MyLocations.TagLocationViewController hideKeyboard]：无法识别的选择器发送到实例0x7f96005165f0

以下是我的代码：

func hideKeyboard(gestureRecognizer: UIGestureRecognizer) {
    let point = gestureRecognizer.location(in: tableView)
    let indexPath = tableView.indexPathForRow(at: point)

    if indexPath != nil && indexPath!.section == 0
        && indexPath!.row == 0 {
        return
    }

    descriptionTextView.resignFirstResponder()
}

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
    descriptionTextView.text = ""
    categoryLabel.text = categoryName

    latitudeLabel.text = String(format: "%.8f", coordinate.latitude)
    longitudeLabel.text = String(format: "%.8f", coordinate.longitude)

    if let placemark = placemark {
        addressLabel.text = stringFromPlacemark(placemark: placemark)
    } else {
        addressLabel.text = "No Address Found"
    }

    dateLabel.text = formatDate(date:Date() as NSDate)

    // let hideKeyboard = "hideKeyboard:"
    // let selector = Selector(hideKeyboard)
    // let selector = Selector({"hideKeyboard:"}())
    let gestureRecognizer = UITapGestureRecognizer(target: self,action: Selector({"hideKeyboard"}()))
    // I have tried with a : character appended after hideKeyboard, but I still failed to run the program.

    gestureRecognizer.cancelsTouchesInView = false

    tableView.addGestureRecognizer(gestureRecognizer)
}