我有以下代码：
override func viewDidLoad() {
super.viewDidLoad()
//Looks for single or multiple taps.
let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "dismissKeyboard")
view.addGestureRecognizer(tap)
// Do any additional setup after loading the view.
}
func dismissKeyboard() {
//Causes the view (or one of its embedded text fields) to resign the first responder status.
view.endEditing(true)
}
在运行应用程序时，当错误修复工作发生另一个错误时，就会出现此错误
由于swift语言的更新，您会出现此错误，请更改您的点击选择器，以执行以下操作：
let tap = UITapGestureRecognizer(target: self, action: #selector(self.dismissKeyboard))
确保方法discuskeyboard在同一个视图控制器中，如果不是，则需要执行#selector(whateverhasthatmethod.discuskeyboard)
此外，请确保discissKeyboard方法实际存在，它应该是以下内容：
func dismissKeyboard(){
YourInputField.endEditing(true)
}
let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(self.dismissKeyboard))
从Swift 2.2开始，请改用以下命令:#selector(YourClass.DissKeyboard)
