resignFirstResponder()
Notifies this object that it has been asked to relinquish its status as first responder in its window.
Declaration
func resignFirstResponder() -> BoolDiscussion
The default implementation returns true, resigning first responder status. You can override this method in your custom responders to update your object’s state or perform other actions, such as removing the highlight from a selection. You can also return false, refusing to relinquish first responder status. If you override this method, you must call super (the superclass implementation) at some point in your code.