Notifies the receiver that it’s been asked to relinquish its status as first responder in its window.
- macOS 10.0+
The default implementation returns
YES, resigning first responder status. Subclasses can override this method to update state or perform some action such as unhighlighting the selection, or to return
NO, refusing to relinquish first responder status.
make method, not this method, to make an object the first responder. Never invoke this method directly.